ISyDMA’5 Virtual Edition

ISyDMA’5 Virtual Edition 15-17 April 2020 Page 1

The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, , 15-17 April 2020

Fifth edition of International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition April 15-17, 2020

Organized by

Cadi Ayyad University, Marrakech Faculty of Sciences Semlalia, Marrakech Moroccan Society of Applied Physics Moroccan Association of Advanced Materials (A2MA).

In cooperation with: Ibn Tofail University, Kenitra, Morocco Soltan Moulay Sliman University, Beni Mellal, Morocco University of Miami, Florida, USA Ibn Zohr University, Agadir, Morocco

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

M O R O C C A N A SSOCIATION OF A D V A N C E D M ATERIALS Organizers & Partners

M O R O C C A N A SSOCIATION O F A D V A N C E D M ATERIALSX

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

Contacts

Prof. ACHOUR Mohammed Essaid Conference Chairman Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco email: [email protected] Phone: +212 766207680

Prof. AIT ALI Mustapha Conference Chairman Faculty of Sciences Semlalia, Cadi Ayyad Univeristy, Marrakech, Morocco email: [email protected] Phone: +212 666935170

Prof. OUERIAGLI Amane Conference Chairman Faculty of Sciences Semlalia, Cadi Ayyad Univeristy, Marrakech, Morocco email: [email protected]

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

Welcome message

Greetings from the ISyDMA’5 organizers. The fifth edition of International Symposium on Dielectric Materials and Applications (ISyDMA) is a follow-up to the highly successful four editions of ISyDMA, ISyDMA 1 (Rabat-Kenitra, Morocco, 4-6 May 2016), ISyDMA 2 (Bucharest, Romania, 11-14 July 2017) and ISyDMA 3 (Beni Mellal, Morocco, 18-20 April 2018), and ISyDMA 4 (Amman, Jordan 2-4 May 2019). The ISyDMA’5 Symposium (15-17 April 2020) was held this year held online due to growing concern over the coronavirus (COVID-19). This virtual event was organized by Cadi Ayyad University and Sciences Faculty Semlalia, Marrakech, Morocco in cooperation with Moroccan Society of Applied Physics and Moroccan Association of Advanced Materials (A2MA). The ISyDMA 5 Virtual Edition provided an international forum for reporting the recent developments in advanced dielectric materials and applications. ISyDMA’5 organizers

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

Scope and Topics

The aim of ISyDMA’5 Virtual Edition is to provide an international forum for the discussion of current research on dielectric materials and applications, such as electrical insulation, dielectric phenomena and related topics.

The scope of the ISyDMA’5 includes all topics related to dielectric materials and their applications:

A: Solar energy Materials.

B: Dielectric properties,polarization phenomena and applications – physics of space charge in non-conductive materials – polymers, composites, ceramics, glasses – biodielectrics – nanodielectrics, metamaterials, piezoelectric, pyroelectric and ferroelectric materials.

C: Impedance spectroscopy applications to electrochemical and dielectric phenomena.

D: Dielectrics for superconducting applications – industrial and biomedical applications – dielectric materials for electronics and photonics – new diagnostic applications for dielectrics – new and functional dielectrics for electrical systems – electrical conduction and breakdown in dielectrics – surface and interfacial phenomena.

E: Electrical insulation in high voltage power equipment and cables – ageing, partial discharges and life expectancy of hv insulation – space charge and its effects in dielectrics. Gaseous electrical breakdown and discharges.

F: High voltage insulation design using computer; based analysis. Partial discharges in insulation: detection methods and impact on ageing. Monitoring and diagnostic methods for electrical insulation degradation. Measurement techniques. Modeling and theory.

G: In addition to other related dielectric phenomena and techniques.

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

Publications

Authors of accepted presentations at the ISyDMA’5 Symposium are invited to submit their full manuscripts for publication reviewed as journal articles. All submitted articles must be written in English only, and should report original, previously unpublished research results, experimental or theoretical, and the final decision will be made based on peer review reports. These papers will be published in International Journals indexed:

- Spectroscopy letters Journal Published by Taylor & Francis in a Regular Issue - Journal of Energy Systems (Scopus) in a Special Issue - Journal of Reinforced Plastics and Composites in a Special Issue - Chemical Product and Process Modeling in a Special Issue - Advances in Materials and Processing Technologies (Taylor & Francis) in a Regular Issue

b

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

Outline of Conference Program

AfternoonOrganizers & PartnersDocumentary about ISyDMA Symposiums Since ISyDMA’5: data Conference 15:00 Local Speech of the chair of ISyDMA’5: Opening Pr. M.E. Achour Ceremony Speech of the chair of ISyDMA’5: 14:00 Pr. A. Oueriagli Wednesday GMT Speech of the chair of ISyDMA’5: April 15, Pr. R.M. Leblanc. 2020

Session 1: Talk1: Pr. R.M.Leblanc + Talk2: Pr. Y. Cho +Talk3: Pr. S.E. San + Talk4: Pr. Alontseva

Poster session: Session 1 Posters: PP1, PP2,…….PP20

Morning Session 2: Talk5: Pr. S.H. Hilal + Talk6: Pr. M. Zdanowską-Frączek + Talk7: Since Pr. A. Tachafine+ Talk8: Pr. B. Aktas + Talk9: Pr. A. Triki 10:00 Local Break 9:00 GMT Poster session: Session 2 Posters: PP21, PP2,…….PP40

Break Thursday Afternoon April 16, 2020 Since Session 3: 15:00 Local Talk10: Pr. A. Vaseashta +Talk11: Pr. H. Odagawa+ + Talk12: Pr. Azeez Talk13: Pr. R. Chaynane+ Talk14: Pr. S. Fathy 14:00 GMT

Break Poster session: Session 3 Posters: PP41, PP42,……. Break Since Session 4: 18:00 Talk15: Pr. M.S. Mousa + Talk16: Pr. C. Popov + Talk17: Pr. H. Rabaa + Talk18: Pr. S. Ehlali Local 17:00 GMT Morning Session 5: Since Friday Talk19: Pr. M. Striccoli +Talk20 : Pr. L. Curri + April 17, 10:00 Local Talk21: Pr. M. Khenfouch + Talk22: Pr. N. Kamanina + Talk23: Bouhafs 2020 9:00 GMT

Break

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The Fifth International Symposium on Dielectric Materials and Applications Faculty of Science Semlalia Cadi Ayyad University, Morocco, 15-17 April 2020

12:00 Local Session 6: 11:00 Talk24: Pr. I. Saadoune + Talk25: L.L.Costa+ Talk26: Pr. S. Soreto GMT T+ Talk27: Pr. G. Turkey Session 7: Talk28: Pr. D. Tsiulyanu + Talk29: Pr. M.P.F. Graca + Afternoon Talk30: Frechero M. A. + Talk31: Outzourhit A. Since Cloture Session 15:00 Local Speech of the chair of ISyDMA’5: Pr. M. Mabrouki 14:00 Speech of the chair of ISyDMA’5: GMT Pr. M. Ait Ali Closing Ceremony Speech of the chair of ISyDMA’6: Pr. A.Tachafine (2021) Littoral-Côte d'Opale University, France

Past ISyDMA Symposiums and Pre-Confrence Schools

ISyDMA’5: Virtual Edition, 15-17 April 2020 MOSSAM’2: Rabat, Morocco, 24-25 June 2019 ISyDMA’4: Amman, Jordan, 2- 4 May 2019 ISyDMA’4 Pre-Conf. School, Irbid, Jordan, April 30 and May 1, 2019 ISyDMA’3: Beni Mellal, Morocco, 18-20 April 2018 MOSSAM’1: Marrakech, Morocco, 15-17April 2018 ISyDMA’2: Bucharest, Romania, 11-14 July 2017 ISyDMA’1: Rabat-Kenitra, Morocco, 4-6 M

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

norary Committee

MEMBER INSTITUTION HBIT HASSAN President of the Cadi Ayyad University, Marrakech EL MIDAOUI AZZEDINE President of the Ibn Tofail University, Kenitra HMINA NABIL President of the Sultan Moulay Slimane University, Beni mellal HALLI OMAR President of the Ibn Zohr University, Agadir EL ALAOUI TALIBI MOHAMED Dean of the Sciences Faculty Semlalia of Marrakech EBN TOUHAMI MOHAMED Dean of the Sciences Faculty of Kenitra ZEGHAL AHMED Dean of the Faculty of Sciences and Technics, Beni Mellal ELMAIMOUNI LAHCEN Dean of the Polydisciplinary Faculty of Ouarzazate

Chair Committee

MEMBER INSTITUTION M. E. ACHOUR Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco M. AIT ALI Semlalia Sciences Faculty, Cadi Ayyad University, Marrakech, Morocco LEBLANC ROGER M. University of Miami, Florida, USA M. MABROUKI LGI, FST, Sultan Moulay Slimane University Beni Mellal, Morocco A. OUERIAGLI Semlalia Sciences Faculty, Cadi Ayyad University, Marrakach, Morocco

Scientific Committee

MEMBER INSTITUTION ACHOUR Mohammed Essaid Faculty of Sciences, Ibn Tofail University, Kenitra, Morocco AHMAD Mehdi University of Montpellier, France AIT ALI Mustapha Cadi Ayyad Univeristy , Marrakech, Morocco AGAM Mohd Arif Bin University Tun Hussein Onn Malaysia, Malaysia AJJI Abdellah Polytechnic School of Montreal, Canada ALONTSEVA Darya East Kazakhstan state technical university, Kazakhstan AZEEZ Abdullah Barzinjy Salahaddin University, Erbil, Iraq AL OMARI Mohammed-Ali Jordan University of Science and Technology, Irbid, Jordan AL-HUSSEIN Mahmoud , Amman, Jordan BAITOUL Mimouna Sidi Mohammed Ben Abdellah University, Fes, Morocco BERRADA Khalid Cadi Ayyad University, Marrakech, Morocco BOUKHEIR Sofia MAScIR, Rabat, Morocco BROSSEAU Christian University of Western Brittany, France BROUILLETTE François Trois-Rivieres University , Quebec, Canada BUKA BUKA Agnes Wigner Research Centre of the Hungarian Academy of Sciences, Budapest, Hungary CHAIB Hassan Polydisciplinary Faculty, Ouarzazate, Morocco CHO Yasuo University of Tohoku, Japan COSTA Luís Cadillon , Portugal CURRI Lucia CNR-IPCF Bari Division, Italy DUDAS Zoltan Wigner Research Centre of the Hungarian Academy of Sciences, Budapest, Hungary EBER Nandor Wigner Research Centre of the Hungarian Academy of Sciences, Budapest, Hungary EL HASNAOUI Mohamed Ibn Tofail University, Kenitra, Morocco EL MANSOURI Abdelmajid ISMAC Institute, Rabat ELAATMANI Mohamed Cadi Ayyad Univeristy , Marrakech, Morocco ELNASHAR Elsayed Faculty Specific Education, Kafrelsheikh University, Egypt FATTOUM Arbi Sciences Faculty of Gafsa, Tunisia FRECHERO Marisa A. Universidad Nacional del Sur, Bahía Blanca. Buenos Aires, Argentina GHAMNIA Mostefa 1 University, GOUMRI SAID Souraya Alfaisal University, Riyadh , Saudi Arabia GRACA Manuel P. F. University of Aveiro, Portugal HADDAD Mustapha Moulay Ismail University, Meknes, Morocco HAMRAOUI Ahmed Paris University France HASSAN Aziz University of Malaya, Kuala Lumpur, Malaysia

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

IWUOHA Emmanuel University of Western Cape, Cape Town, South Africa KAMANINA Natalia St.-Petersburg Electrotechnical University, Russia KEDDOURI Abdelilah Cadi Ayyad Univeristy, Marrakech, Morocco KHATATBEH Qutaibah T. Jordan University of Science & Technology, Irbid, Jordan KHENFOUCH Mohammed UNISA, South Africa KOBOR Diouma University Assane Seck of Ziguinchor, Senegal LEBLANC Roger M University of Miami, Florida, USA MABROUKI Mustapha FST, Sultan Moulay Slimane University, Beni-Mellal, Morocco MAMUNYA Yevgen National Academy of Sciences of Ukraine, , Kyiv, Ukraine MARCHETTI Mario Sapienza Univeristà di Roma, Italy MOUSA Marwan Suleiman Dept. of Physics, Mu'tah University, Al-Karak, Jordan NOUNEH Khalid Faculty of Sciences, University Ibn Tofail, Kenitra, Morocco ODAGAWA Hiroyuki National Institute of Technology, Kumamoto College, Kumamoto, Japan OUERIAGLI Amane FSSM, Cadi Ayyad Univeristy , Marrakech, Morocco OUTZOURHIT Abdelkader FSSM, Cadi Ayyad Univeristy , Marrakech, Morocco PISSIS Polycarpos National Technical University of Athens, Greece PETKOV Plamen University of Chemical Technology and Metallurgy, Sofia, Bulgaria PETKOVA Tamara IEES, Bulgarian Academy of Sciences, Sofia, Bulgaria POPOV Cyril University of Kassel, Germany RAHMOUN Khadidja Sciences Faculty, Tlemcen University, Algeria RAOUADI Khaled University of Carthage, Sciences Faculty, Tunis, Tunisia RESHAK Ali H. Research Centre, University of West Bohemia, Univerzitni, Pilsen, Czech Republic SEBASTIAN Mailadil Thomas CSIR-NIIST, Trivandrum, India SHABAT Mohammed M. Islamic University of Gaza, IUG, Gaza, Palestine SORETO TEIXEIRA Silvia Aveiro University, Portugal SOULEY OUSMANE Harouna Université Abdou Moumouni, Niamey, Niger STRICCOLI Marinella CNR-IPCF Bari Division, Italy SUHIR Ephraim Portland St. Univ., Portland, OR, and ERS Co. USA TACHAFINE Amina LEMCEL, Littoral-Côte d'Opale University, France TELFAH Ahmad Leibniz- für Analytische Wissenschaften, Institut –ISAS, Dortmund, Germany TRIKI Asma Sciences Faculty, Sfax University, Tunisia TSIULYANU Dumitru Technical University, Chisinau, Moldova UZMA Ghazanfar University of the Punjab, Lahore, Pakistan VASEASHTA Ashok NJCU-State University of New Jersey, NJ, USA ZORKANI Izzedine Sidi Mohammed Ben Abdellah University, Fes, Morocco

Organizing Committee

MEMBER INSTITUTION AIT LHAJ DRISS Polydisciplinary Faculty , Ouarzazate AIT TALEB THAMI Polydisciplinary Faculty , Ouarzazate ARIBOU NAJOIA Faculty of Sciences, Kenitra BELHIMRIA RAJAE Faculty of Sciences, Kenitra BOUJIHA TARIK ENSAK, Kenitra BOUKHEIR SOFIA MASCIR, Rabat BOUKNAITIR ILHAM Faculty of Sciences, Kenitra CHAÏB HASSAN Polydisciplinary Faculty , Ouarzazate EL ANSARY ZAKARIA Faculty of Sciences, Kenitra EL MESSOUSSI MOHAMED Cadi Ayyad University, Marrakech ESSAM ELAATMANI MOHAMED Faculty of Sciences Semlalia, Marrakech ELHASNAOUI MOHAMED Faculty of Sciences, Kenitra IDRISSI JOUICHA A. Faculty of Science & Technology, Marrakech IDRISSI JOUICHA Faculty of Science & Technology, Marrakech ABDELLAH KHADIRI MOHY EDDINE Faculty of Sciences Semlalia, Marrakech KHENFOUCH MOHAMMED UNISA, South Africa SAMIR ZINEB Faculty of Sciences , Kenitra TOUAHNI RAJA Faculty of Sciences , Kenitra

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

ZGOU HSAINE Polydisciplinary Faculty , Ouarzazate ZORKANI IZZEDINE Sidi Mohammed Ben Abdellah University, Fes KHADIRI MOHY EDDINE Faculty of Sciences Semlalia, Marrakech KHENFOUCH MOHAMMED UNISA, South Africa

International Committee

MEMBER INSTITUTION ACHOUR Mohammed Essaid Faculty of Sciences, University Ibn Tofail, Kenitra, Morocco AIT ALI Mustapha Faculty of Science Semlalia, Cadi Ayyad Univeristy , Marrakech, Morocco AGAM Mohd Arif Bin University Tun Hussein Onn Malaysia, Malaysia AZEEZ Abdullah Barzinjy Salahaddin University, Erbil, Iraq AL OMARI Mohammed-Ali Jordan University of Science and Technology, Irbid, Jordan AL-HUSSEIN Mahmoud University of Jordan, Amman, Jordan BROSSEAU Christian Université de Bretagne Occidentale, France BUKA Agnes Wigner Research Centre of the Hungarian Academy of Sciences, Budapest, Hungary CHO Yasuo University of Tohoku, Japan COSTA Luís Cadillon University of Aveiro, Portugal CURRI Maria Lucia CNR-IPCF Bari Division, Italy ÉBER Nándor Wigner Research Centre of the Hungarian Academy of Sciences, Budapest, Hungary ELAATMANI Mohamed Faculty of Science Semlalia, Cadi Ayyad Univeristy , Marrakech, Morocco ELHAD KASSIM Said Ahmed F.S.T, University of the Comoros, Moroni, Union of the Comoros FATTOUM Arbi Sciences Faculty of Gafsa, Tunisia KAMANINA Natalia St.-Petersburg Electrotechnical University, Russia LEBLANC Roger M University of Miami, Florida, USA MABROUKI Mustapha FST, Sultan Moulay Slimane University, Beni-Mellal, Morocco MOUSA Marwan Suleiman Mu'tah University, Al-Karak, Jordan ODAGAWA Hiroyuki National Institute of Technology, Kumamoto College, Kumamoto, Japan OUERIAGLI Amane Faculty of Science Semlalia, Cadi Ayyad Univeristy , Marrakech, Morocco PETKOV Plamen University of Chemical Technology and Metallurgy, Sofia, Bulgaria PETKOVA Tamara IEES, Bulgarian Academy of Sciences, Sofia, Bulgaria POPOV Cyril University of Kassel, Germany RAHMOUN Khadidja Sciences Faculty, Tlemcen University, Algeria STRICCOLI Marinella CNR-IPCF Bari Division, Italy TACHAFINE Amina LEMCEL, Littoral-Côte d'Opale University, France TRIKI Asma Sciences Faculty, Sfax University, Tunisia

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

DETAILED PROGRAM Wednesday, April 15th 2020

Opening ceremony Since 15:00 - 14:00 (GMT) - Documentary about ISyDMA Symposiums - ISyDMA’5: data Conference - Speech of the chair of ISyDMA’5: Pr. ACHOUR Mohammed Essaid - Speech of the chair of ISyDMA’5: Pr. OUERIAGLI Amane - Speech of the chair of ISyDMA’5: Pr. LEBLANC Roger M

Talk Session: 1

Talk 1:

Pr. LEBLANC Roger University of Miami, 1301 Memorial Drive USA Email : [email protected]; Physicochemical Characterization of a Novel Carbon Nanomaterial: Carbon Dots

Talk 2:

Pr. CHO Yasuo Research Institute of Electrical Communication, Tohoku University, Sendai Japan Email : [email protected]; Scanning nonlinear dielectric microscopy nano science and technology for next generation ultra-high density ferroelectric data storage beyond hard disk drive and flash memory

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 3:

Pr. SAN Sait Eren Department of Physics, Kocaeli University, Kocaeli Turkey Email : [email protected]; Dielectric Analysis of cheap polymeric structures for Electronics

Talk 4:

Pr. ALONTSEVA Darya East-Kazakhstan State Technical University, Ust-Kamenogorsk, Kazakhstan Email : [email protected]; Fabrication and characterization of Zi microplasma coatings for biomedical applications

Poster session : Session 1 PP1, PP2, …….. , PP19

Thursday, April 16th 2020

Talk Session: 2

Talk 5:

Pr. HIKMAT S. Hilal An-Najah National University, Nablus Palestine Email : [email protected]; Charge transfer catalysts embedded inside dielectric polymer matrix-modified metal

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

chalcogenide film electrodes in photoelectrochemical processe

Talk 6:

Pr. ZDANOWSKA-FRĄCZEK Maria Mariana Smoluchowskiego 17, Poznań Poland Email : [email protected]; Influence of pressure on electrical properties of proton conductors

Talk 7 :

Pr. TACHAFINe Amina Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral , Calais France Email : [email protected]; Doping effect on macroscopic and nanoscopic electrical properties of BST and BZT thin films synthesized by sol-gel process

Talk 8:

Pr. AKTAŞ Bülent Harran University osmanbey campus Engineering Faculty, Mechanical Engineering Department, Sanliurfa Turkey Email : [email protected]; Ionic conductivity of BaO-doped 8 mol% yttria-stabilized cubic zirconia (8YSZ)

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 9:

Pr. TRIKI Asma Faculty of Sciences of Sfax, 3018 Sfax, ,, Sfax Tunisia Email : [email protected]; Dielectric analysis of interfacial polarization of Jute-carbon black hybrid composite materials

Poster session : Session 2 PP21, PP2, …….. , PP39

Talk Session: 3

Talk 10:

Pr. VASEASHTA Ashok International Clean Water Institute, Manassas, VA USA, Email : [email protected]; [email protected]; Water Quality-Environmental Factors and Impact

Talk 11:

Pr. ODAGAWA Hiroyuki Kumamoto College, Koshi-shi,, Kumamoto

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Japan Email : [email protected] ; Application of scanning nonlinear dielectric microscopy for various piezoelectric domain structure measurement

Talk 12:

Pr. BARZINJY Azeez Salahaddin University-Erbil, Kurdistan Region, Iraq, Erbil Iraq Email : [email protected]; Green Synthesis and Characterization of Zinc Oxide Nanoparticles: the effects of plant extracts and zinc salts

Talk 13:

Pr. CHAYNANE Rachid Faculté des Sciences Appliquées Ait Melloul Université Ibno Zohr, Agadir Morocco Email : [email protected]; Effective Parameters Extraction of Metamaterials based on Split-Ring Resonators

Break

Poster session : Session 3 PP40, PP41, ……..

Talk Session: 4

Talk 15:

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Pr. MOUSA Marwan S. Mu'tah University,, Al-Karak Jordan Email : [email protected];[email protected]; Mechanism of the Electron Emission from cathodes consist of metallic or fiber core coated with layer of Polystryne or Polyethylene

Talk 16:

Pr. POPOV Cyril Heinrich-Plett-Str. 40, Kassel Germany Email : [email protected]; Diamond nanostructures for photonic and sensor applications

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 17:

Pr. RABAA Hassan BP 133, Kenitra 14000, Morocco, Kenitra Morocco Email : [email protected]; Cluster modeling approach of hydroxylated compounds [Nb2O5]n with (n=2,5,6)coordinated to glucose and cysteine probing Inhibition Activities

Talk 18:

Pr. EHLALI Souad Université Mohamed V - Faculté des Sciences de Rabat Morocco Email : [email protected]; Energy Harvesting Technologies in Wireless Sensor Networks (EHT-WSN): A Review

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Friday, April 16th 2020

Talk Session: 5

Talk 19:

Pr. STRICCOLI Marinella CNR-IPCF Bari, Italy, Bari Italy Email : [email protected] ; Nanocrystal Coupled Systems for Energy and Charge Transfer Processes

Talk 20:

Pr. CURRI Lucia University of Bari CNR-IPCF Bari, Italy, Bari Italy Email : [email protected] ; Colloidal nanomaterials: engineering surface chemistry for life science applications

Talk 21:

Pr. KHENFOUCH Mohammed Africa Graphene Center, Physics department, Eureka building, CSET, UNISA-Florida Campus, Roodepoort, 1709 Gauteng, South Africa,

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South Africa Email : [email protected]; Advanced 2D materials and their applications

Talk 22:

Pr. KAMANINA Natalia Kadetskaya Liniya V.O., dom.5, korpus 2, St.- Petersburg, 199053, St.- Petersburg, Russia Email : [email protected]; Nanotechnology approaches in solar energy, laser and general photonics materials

Talk 23: Pr. BOUHAFS Benamar Université de Tlemcen, Faculté des Sciences, Laboratoire de Physique Théorique, Tlemcen Algeria Email : [email protected]; Effect of Porous Silicon Carbide on Resonant Coupled Modes in a Multilayer Sensor

Talk Session: 6

Talk 24:

Pr. SAADOUNE Ismael FST, Cadi Ayyad University, Marrakech Morocco Email : [email protected];

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 25:

Pr. COSTA Luis Physics Department, Aveiro Portugal Email : [email protected]; Using PTCR effect for industrial applications Talk 26:

Pr. SORETO Sílvia Campus Universitário de Santiago, 3810-193 Aveiro, Aveiro Portugal Email : [email protected]; Synthesis of lithium ferrites nanoparticles by biogenic method

Talk 27:

Pr. TURKY Gamal 12622-Giza, Cairo Egypt Email : [email protected]; Nanostructured Materials & Dielectric Investigations

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk Session: 7 Talk 28:

Pr. TSIULYANU Dumitru Department of Physics, Technical University, Chisinau Moldova Email : [email protected];

Talk 29:

Pr. GRACA M. Pedro Fernandes Physics Department, Aveiro Portugal Email : [email protected]; Glasses and glass-ceramics for electro-optic applications Talk 30:

Pr. FRECHERO Marisa Universidad Nacional del Sur.Bahía Blanca, Buenos Aires Argentina Email : [email protected] ; New glassy hybrid materials for electrochemical green energy storage

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Talk 31:

Pr. OUTZOURHIT Abdelkader Cadi Ayyad University, Marrakech Morocco Email : [email protected] Spectroscopic investigation of a-Si:H p-i-n solar Cells Closing Ceremony Since 14:00 - 15:00 (GMT) - Speech of the chair of ISyDMA’5: Pr. M. Mabrouki - Speech of the chair of ISyDMA’5: Pr. M. Ait Ali - Speech of the chair of ISyDMA’5: Pr. A.Tachafine

Poster Presentations (Session 1)

PP1 : Electrochemical Impedance Spectroscopy study of Zinc electrodeposition EL FAZAZI Asmae, Ibn Tofail University , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP2 : Influence of RF-power on the optical, structural, and morphological properties of ZnS:Cr thin films CHEIKH Mohamed, Faculty of Sciences Semlalia, Cadi Ayyad University , MARRAKECH, Morocco [email protected] ………………………………………………………………………………………………… PP3 : Structural and impedance spectroscopic study of Zinc doped in tetragonal tungsten bronze BENDAHHOU (1) Amine, Faculté des sciences Oujda , Nador, Morocco [email protected]; ………………………………………………………………………………………………… PP4 : Relationships between crystalline structure and dielectric properties in Sr2NdxSm(1- x)Ti2Nb3O15 ceramics CHOURTI Karim, Multidisciplinary Faculty of Nador, Department of Chemistry, Mohammed First University , Nador, Morocco [email protected]; ………………………………………………………………………………………………… PP5 : Corrosion inhibition performance of two imidazole derivatives on mild steel in 1M hydrochloric acid: electrochemical, thermodynamical and theoretical calculation ARIBOU Zakia, Ibn Tofail University , Kenitra, Morocco [email protected]; ………………………………………………………………………………………………… PP6 : Effect of incorporating two gate insulators (SiO2 and Al2O3) on the performance of the a-IGZO-based TFT transistor

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TAMOUM Mostefa, Université Djillali Liabes de Sidi Bel Abbes , Sidi Bel Abbes, Algeria [email protected]; ………………………………………………………………………………………………… PP7 : Effect of microcrystalline cellulose on dielectric properties of latex hybrid composites LARGUECH Salma, Faculty of Sciences of Sfax, University of Sfax, BP 3018 Sfax, Tunisia , Sfax, Tunisia [email protected]; ………………………………………………………………………………………………… PP8 : Characterization and thermal conductivity of cellulose based cement composite RBIHI SARA, Université Sultan Moulay Slimane Faculté des Sciences et Techniques Beni Mellal , Beni Mellal, Morocco [email protected]; ………………………………………………………………………………………………… PP9 : Using different DFT implementations for studying structural, electronic and electrical properties of tetragonal BaTiO3 and PbTiO3 AMOUNAS said, Polydisciplinary Faculty of Ouarzazate, Ibn Zohr University , Ouarzazate, Morocco [email protected] ………………………………………………………………………………………………… PP10 : Electrical study of a composite material based on an epoxy polymer containing cyclotriphosphazene DAGDAG Omar, Ibn Tofail University , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP11 : Coupled Heat Transfer by Natural Convection and Surface Radiation in an Open Cavity CHARQUI Zouhair, Faculty of Sciences Semlalia, Cadi Ayyad University , Marrakech Morocco [email protected] ………………………………………………………………………………………………… PP12 : Numerical study of AgInTe2 solar cells using SCAPS BENSEDDIK Nadia, Laboratory of Applied Microelectronics, Department of Electronics, , Sidi Bel Abbes, Algeria [email protected] ………………………………………………………………………………………………… PP13 : Crossover from VRH E-S to NNR VRH in 2D p-GaAs at B=0 DLIMI Said, Physics department, University Ibn zohr, Faculty of sciences, , Agadir, Morocco [email protected]; ………………………………………………………………………………………………… PP14 : Contribution to the study of elementary magnetic excitations in multilayer Fe/Pt systems KARAM Marouan, Faculty of Sciences. University of Ibn Tofail.Kenitra , Kenitra, Morocco [email protected]; ………………………………………………………………………………………………… PP15 : Natural convection in a square cavity containing two heat-generating conducting body HIDKI Rachid, Faculty of Sciences Semlalia, Cadi Ayyad University , Marrakech, Morocco [email protected] ; ………………………………………………………………………………………………… PP16 : Numerical simulation of natural convection in partially open cavity with vertical conductive obstacle

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

AZAGAR Khalid, Faculty of Sciences Semlalia, Cadi Ayyad University , Marrakech, Morocco [email protected]; ………………………………………………………………………………………………… PP17 : Thermal and electrical characterization of Poly(butylene succinate) (PBS) / Polypropylene (PP) with different blend ratio TAKTAK Sirine, Faculty of Sciences of Sfax, University of Sfax, BP 3018 Sfax, Tunisia , Sfax, Tunisia [email protected]; ………………………………………………………………………………………………… PP18 : Influence of Heat Sources/Sinks on Unsteady Natural Convection in a Differentially Heated Enclosure Temperature BOUKENDIL Mohammed, Faculty of Sciences Semlalia, Cadi Ayyad University , MARRAKECH, Morocco [email protected]; ………………………………………………………………………………………………… PP19 : Carriers mobility determination in PS/PANI films by the potential decay technique MEZDOUR Douniazad, Jijel University , Jijel, Algeria [email protected]

Poster Presentations (Session 2)

PP20 : The temperature effect on the physical properties of PbS nanocrystalline developed by the chemical bath deposition method (CBD) EL MADANI Aziz, Ibn tofail university , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP21 : Optimization of factors influencing the brightness of nickel deposition: application and modeling by design of experiment KHEMMOU Nidal, ibn tofail university , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP22 : CaSi2: a promising material for the synthesis of novel functionalized two- dimensional crystalline silicon nanosheets NAYAD Abdallah, Faculty of Sciences Semlalia, Cadi Ayyad University , MARRAKECH, Morocco [email protected] ………………………………………………………………………………………………… PP23 : A comparative study on the effect of corona discharge and dielectric barrier discharge treatment on polypropylene films BOUGHAROUAT Ali, , Bouira, Algeria [email protected] ………………………………………………………………………………………………… PP24 : Structural and optical properties of transparent magnesium oxide thin film DjAABOUBE Halima, Université de Constantine Algérie , Constantine, Algeria [email protected] ………………………………………………………………………………………………… PP25 : Оrganic – inorganic hybrids, obtained by sol-gel approach at different inorganic catalysts ILCHEVA Vania, nstitute of Electrochemistry and Energy Systems - BAS , Sofia, Bulgaria [email protected]

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

………………………………………………………………………………………………… PP26 : study of ferrite by resonant nuclear scattering Manganes- iron : notstoichiometric BENLALLI ABDELKRIM, Radiation Physics Laboratory, Department of Physics, Faculty of Sciences, Badji Mokhtar University , Annaba, Algeria [email protected] ………………………………………………………………………………………………… PP27: Structural and Magnetoelectrical properties of La0.6Y0.1Ba0.2Sr0.1MnO3 manganite MERICHE Faiza, Laboratory of Materials Studies (LEM), Department of Physics, Mohamed Seddik Ben Yahia University , Jijel, Algeria [email protected] ………………………………………………………………………………………………… PP28 : Electrical impedance spectroscopy (EIS) as a tool to investigate the complexation process of Gum Arabic and Chitosan solution: a review ZAIM Soumia, université chouaib doukkali , El jadida, Morocco [email protected] ………………………………………………………………………………………………… PP29 : Electrical studies of reduced graphene oxide/epoxy polymer nanocomposites NIOUA Yassine, Université Ibn Tofail, Faculté des Sciences , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP30 : Numerical simulation of combined heat transfer through hollow bricks wall BOUCHAIB Jamal, Faculty of Sciences Semlalia, Cadi Ayyad University , MARRAKECH, Morocco [email protected] ………………………………………………………………………………………………… PP31 : Studies on the Electrical and Thermal properties of PMMA/Carbon-dots nanocomposites EL-ANSARY Zakaria, Université Ibn-Tofail, Faculté des Sciences - Kénitra , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP32 : Design the antenna with new dielectric substrate for new generation (5G) EL HASNAOUI Yassine, University Ibn Tofail, National School of Applied Sciences (ENSA) , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP33 : Phase transition in high-mobility Si MOSFETs LIMOUNY Lhoussine, Physics department, University Ibn zohr, Faculty of sciences, , Agadir, Morocco [email protected] ………………………………………………………………………………………………… PP34 : Structural, electrical, and impedance spectra analysis of PMMA/PPy composite materials ARIBOU Najoia, LASTID Laboratory, Physics Department, Faculty of Sciences, Ibn Tofail University , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP35 : Structural, optical, dielectrical and electrical properties of Aloe Vera leaf exudate: Application as natural dye in solar cell

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

HNAWI Salma Kaotar, Faculty of Sciences Semlalia, Cadi Ayyad University , MARRAKECH, Morocco [email protected] ………………………………………………………………………………………………… PP36 : SANS characterization and impedance spectra analyses of polyester/graphite composite BELHIMRIA Rajae, LASTID Laboratory, Department of Physics, Faculty of Sciences, University Ibn Tofail, Kenitra, Morocco , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP37 : Thermal and dielectric behavior of ternary composites Carbon nanotubes/Graphite/Polyester SAMIR zineb, LASTID Laboratory, Physics Department, Faculty of Sciences, Ibn Tofail University , Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP38 : Electrical and Dielectric Properties of Gt/CNT/Engine Oil Nanofluids BARNOSS Sanae, faculté de sciences, université Ibn Tofail kénitra , kénitra, Morocco [email protected] PP39 : Analysis of the dielectric function of Aluminum (Al) in bulk and nanometric states AIT HAMMOU Brahim , Faculté des Sciences d‘Agadir , Agadir , Morocco [email protected]

Poster Presentations (Session 3)

PP40 : Structural, dielectric and impedance spectroscopy analysis of lead free (Ba0,85Ca0,15Zr0,1Ti0,9O3) ceramics synthesized by sol-gel method KHARDAZI Said ,CADI AYYAD UNIVERSITY ,MARRAKECH , Morocco [email protected] ………………………………………………………………………………………………… PP41 : Anisotropy of conductivity and nonlinear effects in ε-GaSe crystals AL-HATTAB Mohamed , Université Sultane moulay slimane Beni mellal , Beni mellal , Morocco [email protected] ………………………………………………………………………………………………… PP42 : Study on the effect Er dopant on the optoelectronic properties of nanostructured ZnO ACHEHBOUNE Mohamed , Sidi Mohamed Ben Abdellah University/ Faculty od Sciences , Fes , Morocco [email protected] ………………………………………………………………………………………………… PP43 : Graphene oxide coated flower-shaped ZnO NRs for UV detection application BOUKHOUBZA ISSAM , Sidi Mohamed Ben Abdellah University/ Faculty od Sciences , Fes, Morocco [email protected] ………………………………………………………………………………………………… PP44 : Effect of conduction band non-parabolicity on the intersubband transitions in GaInN/AlInN quantum well heterostructures MOUDOU L‘houcine , Université Sultane moulay slimane Beni mellal , Beni mellal , Morocco moudou1993@@email.com …………………………………………………………………………………………………

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

PP46 : Optical and electrical properties of some skin of tomatoes, potatoes and peppers ABOULOULA C. N., BOUKNAITIR I. Nanomaterials for Energy and Environment Laboratory (N2EL), Faculty of Sciences, Semlalia, , Morocco and Sciences Faculty of Kenitra, Morocco. [email protected]; [email protected] ………………………………………………………………………………………………… PP47 : Investigating the electrical transport mechanisms of pentafunctional epoxy resin/natural phosphate composites TAOUFIK A. , LASTID Laboratory, Department of Physics, Faculty of Sciences, University Ibn Tofail, Kenitra, Morocco , Kenitra , Morocco [email protected] ………………………………………………………………………………………………… PP48 : Estimating of dew yield from the calcite dew condenser BENLATTAR M. , Laboratoire de Physique de la Matière Condensée, Faculté des Sciences Ben M‘Sik, Université Hassan II, Casablanca, Morocco. [email protected] ………………………………………………………………………………………………… PP49 : Diamagnetic susceptibility, polarisability and photoionization cross section of a single dopant in GaAs core/shell Quantum Dot. M‘ZERD S. , ZORKANI I., FEDDI E. , KHENFOUCH M., University of Sidi Mohammed Ben Abdallah, Faculty of Science Dhar El Mahraz Fes [email protected] ………………………………………………………………………………………………… PP50 : Resonant optical properties of AlGaAs/GaAs multiple-quantum-well under the effect of hydrostatic pressure CHRAFIH Y., RAHMANI K., KHENFOUCH M., BAJJOU O. , ZORKANI I., Faculty of Polydisciplinary, (ERPTM), BP 590, 23000 Beni Mellal-Morocco [email protected] ………………………………………………………………………………………………… PP51 : Structural, and dielectric properties of BaO-K2O-TiO2 -P2O5 glasses and its associated glass-ceramics HAILY E. , BIH L. , YOUSFI S. , EL BOUARI A. , MANOUN B., Equipe Physico-Chimie la Matière Condensée (PCMC), Faculté des Sciences de Meknès, Maroc. ………………………………………………………………………………………………… PP52 : Effect of tin doping on structural, optical and electrical properties of ZnO thin films prepared by sol-gel method AL ARMOUZI Naoual , HILAL Hikmat S., MABROUKI Mustapha Industrial engineering laboratory, Sultan Moulay Slimane University, Faculty of Science and Technology, Beni mellal [email protected] ………………………………………………………………………………………………… PP53 : Field Electron Emission from Carbon Black Nanotips: Characterization and Analysis ALBRAIKAT Hatem A., M. ALLAHAM Mohammad, AL-AKHRAS M-Ali and MOUSA Marwan S., Department of Physics, The University of Jordan, Amman, Jordan. [email protected] ………………………………………………………………………………………………… PP54 : Field Electron Emission from W – Tips Coated with various Thicknesses of Polystyrene – Characteristics & Analysis

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

ALABTH Mo‘tasam, SHATNAWI Moneeb T., ALLAHAM Mohammad M. and MOUSA Marwan S., Department of Physics, The University of Jordan, Amman, Jordan. [email protected] ………………………………………………………………………………………………… PP55 A sample method to control the growth of copper oxide nanowires for solar cells and catalytic applications NKHAILI L., Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, Morocco, [email protected] ………………………………………………………………………………………………… PP56 : Influence of Polystyrene layer on the Field Electron Emission Performance of Nano-Apex Carbon Fiber Emitters FAWAEER Saleh H. , SHATNAWI Moneeb T., ALLAHAM Mohammad M. and MOUSA Marwan S., Department of Physics, The University of Jordan, Amman, Jordan. . [email protected] ………………………………………………………………………………………………… PP57 : Observations on the effect of coating Nano-Tip Apex with a thin layer of dielectric material on both electron and Ion Emission Mechanisms AL SOUD Ammar, BOLL Torben, KNÁPEK Alexandr, MOUSA Marwan S., Surface Physics and Materials Technology lab, Department of Physics, Mutah University, Jordan. [email protected] ………………………………………………………………………………………………… PP58 : Temperature influence on the density of two-dimensional electron gas in Al0.18 Ga0.82 N/GaN HEMT F.DJELTI , A. OULD-ABBAS , Research unit of Materials and Renewable energies (URMER),University Abou Bakr Belkaïd, Tlemcen, Algeria [email protected] ………………………………………………………………………………………………… PP59 : A facile route for synthesis of copper iron tin sulfide thin films AIT LHAJ D., EL KISSANI A., WELATTA F., CHAIB H., OUERIAGHLI A., OUTZOURHIT A., Cadi Ayyad University (UCA),Marrakech, Morocco [email protected] ………………………………………………………………………………………………… PP60 : Optimization photoelectrochemical of the cuprous oxide (Cu2O), by electrodeposition FLORIC RAKOTONARIVO E., ABOULOULA C. N., NARJIS A., NKHAILI L., BROUILLETTE F., OUERIAGLI A. , Laboratoire des Matériaux de l‘Energie et de l‘Environnement (LaMEE, ex-LN2E), Faculté des Sciences Semlalia,Université Cadi Ayyad, Marrakech, Morocco [email protected] ………………………………………………………………………………………………… PP61 : Electrochemically Deposited Thermoelectric Binary bismuth selenide Thin films Khadiri Mohy eddine, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco. [email protected] ………………………………………………………………………………………………… PP62 Preparation and characterization of copper oxide thin films by RF sputtering for solar selective absorbers application EL AAKIB Hind , Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech, Morocco, [email protected] …………………………………………………………………………………………………

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

………………………………………………………………………………………………… PP63 Dielectric relaxation in biocomposite material based on green microcrystalline cellulose reinforced vinyl resin matrix KREIT Lamyaa, Sciences Faculty, Ibn Tofail University, B.P. 133, 14000 Kenitra, Morocco [email protected] ………………………………………………………………………………………………… PP64 Durability study of solar mirrors by an outdoor exposure in a desertic site LAKHOUIL Sara , Moroccan foundation for Advanced Science Innovation and Research (MAScIR)-Rue Mohamed Al Jazouli, Rabat, Morocco [email protected] …………………………………………………………………………………………………

Winners of the best Poster Award

Electrochemical Impedance PP1 EL FAZAZI Asmae Ibn Tofail University, Spectroscopy study of Zinc Kenitra, Morocco electrodeposition Mohamed Seddik Ben Structural and Magnetoelectrical PP27 MERICHE Faiza Yahia University, Jijel, properties of La0.6Y0.1Ba0.2Sr0.1MnO3 Algeria manganite SANS characterization and impedance PP35 BELHIMRIA Rajae Ibn Tofail University, spectra analyses of polyester/graphite Kenitra composite Sidi Mohamed Ben PP42 BOUKHOUBZA Issam Abdellah University, Fes, Graphene oxide coated flower-shaped Morocco ZnO NRs for UV detection application Faculty of science and Effect of tin doping on structural, optical PP52 AL ARMOUZI Naoual technology, Beni Mellal, and electrical properties of ZnO thin Morocco films prepared by sol–gel method Faculty of Sciences PP60 FLORICRAKOTONARIVOA E. Semlalia, Cadi Ayyad Optimization photoelectrochemicalof the University, Marrakech, cuprous oxide (Cu2O), by Morocco electrodeposition

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Abstracts

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Part A Talks

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 1 Physicochemical Characterization of a Novel Carbon Nanomaterial: Carbon Dots Roger M. Leblanca,+ a Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA + Author for correspondence: [email protected] Carbon dots (CDs) are a group of novel carbon-based spherical (nanoparticles) NPs with diameters less than 10 nm. They are widely present in the nature and can be also synthesized using various carbon-based substances as precursors by either top-down or bottom-up approaches. They are well characterized for tunable surface functionality, excellent photoluminescence (PL), high photostability and water dispersity, good biocompatibility, and nontoxicity. Also, they display different sizes and surface chemistry depending on the preparation methods and precursors applied. Applications of CDs in drug delivery, bioimaging, sensing, and other nanotechnology fields are rapidly rising due to their aforementioned unique properties. In addition, various spectroscopic and microscopic measurements have been performed on diverse CD preparations, which revealed some typical physicochemical features of CDs. For example, UV/vis absorption spectra of CDs usually display two peaks at 250 and 350 nm, which corresponds to C=C and C=O conjugate structures, respectively. Most fluorescence emission spectra have shown an excitation- dependent PL emission of CDs, which arouses a debate regarding the PL mechanism of CDs. The spherical morphologies of different CDs are studied through a combination of atomic force microscopy (AFM) and transmission electron microscopy (TEM) to obtain the three- dimensional data. As for the structural analysis of CDs, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and thermogravimetric analysis (TGA) have all been utilized to investigate the surface functionalities and core structures.

Considering the abundant functionalities such as -COOH and -NH2, distinct CDs were conjugated via an amidation reaction mediated by EDC and NHS to explore to construct large multifunctional carbon-based nanostructures. Also, zeta potential studies show most CDs carry negative charge on the surface, which inspires numerous researches on the electrical or dielectric properties of CDs. Keywords: Carbon Dots, Physicochemical Characterization, Structure, Conjugation, Dielectric properties.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 2 Scanning nonlinear dielectric microscopy nano science and technology for next generation ultra-high density ferroelectric data storage beyond hard disk drive and flash memory

Y. Choa,+ aResearch Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba- ku, Sendai 980-8577, Japan + Author for correspondence: [email protected] An investigation of ultrahigh-density ferroelectric data storage based on scanning nonlinear dielectric microscopy (SNDM) is described. For the purpose of obtaining fundamental knowledge on next-generation ultra-high density ferroelectric data storage, several experiments studies on nanodomain formation in a congruent lithium tantalate single crystal and PZT thin film were conducted. 2.8-nm  single nano-domain inversion dot formation, real information storage at a density of 4 Tbit/inch2, and 500-psec high speed domain switching were achieved by using a ferroelectric data storage system based on atomic force microscopy-type SNDM with a piezo linear scanner. Reproduction with a bit rate of 3.8 Mbps and recording with a bit rate of 20 Mbps and memory density of 3.4Tbit/inch2 were achieved using the hard-disk-drive (HDD)-type data storage system. Moreover, in the HDD-type ferroelectric data storage system, real information recording at a density of 1 Tbit/inch2 was demonstrated. Finally, thermal stability of ferroelectric nano-domain dot with a size of one crystal unit cell is discussed.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 3 Dielectric Analysis of cheap polymeric structures for Electronics S. E. San, a,+ A. Hezamb, B. Karadoğanb, M. Okutanc a Department of Physics, Kocaeli University, Izmit, Turkey bDepartment of Chemistry, Yildiz Technical University, Istanbul, Turkey cDepartment of Physics, Yildiz Technical University, Istanbul, Turkey

+ Author for correspondence: [email protected]

Advances in nanoscience and nanotechnology bring about several application possibilities. Artificially designed materials are of critical importance in these applications. Apart from economic advantages, organic materials are very good candidates for flexible implementations of electronics and sandwiched structures are noteworthy designs amongst them indeed. Some of these novel applications are discussed throughout the talk; Firstly, the exploitation of Liquid Crystals (LC) are discussed. Actually they are highly nonlinear optical materials and are sensitive against optical, electrical and magnetic fields. This sensitivity could be exploited for various device designs. In the scope of this presentation, some concrete examples will be given for nanotechnological applications of LCs [1,2]. Then the employment of a memory shape alloy, so called Nitinol (NiTi alloy) [3], in a LC & polymer matrix is presented, where the shape switching of a polymer skeleton would be monitored via electrical characterization. Last case study devoted to Polydimethylsiloxanes (PDMS)[4], which were studied with different concentrations of Boron in the structure of a polymer matrix. Dielectric characterization of prepared composite samples was analyzed by dielectric spectroscopy. 10 % Boron doping is found to be an optimized amount for a proper composite according to outcomes of dielectric characterization.

Keywords: Nematic Liquid Crystals, Flexible Electronics, Nanorods, Nitinol, Polydimethylsiloxane, Boron,

1- I Dierking, SE San, Applied Physics Letters 87 (23), 233507 (2005). 2- Okutan, M., San, S. E., Basaran, E., & Yakuphanoglu, F. Physics Letters A, 339(6), 461- 465. (2005). 3- Lee, J., & Shin, Y. C. Lasers in Manufacturing and Materials Processing, 6(1), 41-58. (2019) 4- Park, Eun Ji, et al. RSC Advances 3.31 12571-12576. (2013)

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 4 Fabrication and Characterization of Zi Microplasma Coatings for Biomedical Applications D. Alontsevaa, S. Voinarovychb, O. Kyslytsiab, N. Prokhorenkovaa, A. Krasavina, T. Kolesnikovaa aD. Serikbayev East Kazakhstan State Technical University, 69 Protozanov Street, Ust- Kamenogorsk, 070004, Kazakhstan bE.O.Paton Electric Welding Institute of NAS of Ukraine, 11 Kazymyr Malevich Street, Kyiv, 03150, Ukraine

+ Author for correspondence: [email protected]

This paper presents new results of studying the influence of parameters of Zr wire microplasma spraying (MPS) on the structure of Zr coatings. Individual particles of sprayed Zr wire and Zr splats on the substratewere collected under various spraying parameters and evaluated by Scanning Electron Microscopy (SEM) to establish a relationship with the coating microstructure. The particles were characterized by measurement of their sizes and the obtained results were evaluated in terms of their degree of melting. This was compared with the experimentally observed coating microstructure type and finally correlated to the investigated coating porosity to select the specific MPS parameters to deposit Zr coatings onto medical implants from Ti alloy. Acknowledgement. This work was supported by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan for the project number AP05130525

Keywords: Microplasma Spraying, porosity, SEM, titanium implants, Zirconium coatings

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 5 Charge transfer catalysts embedded inside dielectric polymer matrix- modified metal chalcogenide film electrodes in photoelectrochemical processes H. S. Hilal.a+, A. Zyouda aSSERL, Chemistry Department, An-Najah National University, Nablus, Palestine + Author for correspondence: [email protected] Metal chalcogenide nanofilm electrodes MX (M=Cd, Cu or others ; X=S, Se or Te) are investigated in photoelectrochemical (PEC) as replacement for the more costly p-n photovoltaic junctions. However, such electrodes are unstable and yield low conversion efficiency [1]. We developed simple strategies to enhance both stability and conversion efficiency for such electrodes. Attachment of electro-active species, embedded inside polymeric matrices, to the surface of the electrode permanently affects its photo-electrochemical (PEC) properties. The electro-active species behaves as charge transfer catalyst across the solid/liquid junction. This increases the charge (holes or electrons depending on the type of the SC) transfer rate between the electrode and the redox couple. The SC electrode can thus be stabilized to photo-degradation. The strategy has been effective for various nano-film electrodes (CuS, CuSe, CdSe, CdTe and others). Conversion efficiency is enhanced from ~1.0% to above 10%. Careful pre-annealing the electrodes, before coating, and controlled cooling rate, give extra enhancement in PEC characteristics [2]. Pre-annealed electrodes, coated with electroactive metalloporphyrina materials inside polymer matrices, yield >18.0% conversion efficiency [3-4]. The values are higher than US DOE expectation for 2020, and have not been reported earlier for metal chalcogenide film electrodes. This presentation will show a critical survey of our results observed throughout the last 20 years, as compared to literature. Our new model proposed for the efficiency and stability enhancement will also be rigorously presented. Future prospects of this work will also be discussed. Keywords : Semiconductors, Thin Film Electrodes, Conversion Efficiency, Stability, Charge Transfer Catalysis. 1- H. S. Hilal, A. Zyoud, M. H. S. Helal, H. Bsharat, H. H. Hilal and A. Cheknane, Solar Energy, 183, 704 (2019). 2- A. Zyoud, S. Abu-Alrob, T. W. Kim, H-J. Choi, M. H. S. Hilal, H. Bsharat, H. S. Hilal, Materials Science in Semiconductor Processing, 107, 104852 (2020). 3- A. Zyoud, R. S. AlKerm, R. S. Alkerm, D. H. Abdelhadi, D-H. Park, M. H. S. Helal, G. Campet, R. W. Muthaffar, H. Kwon and H. S. Hilal, Solar Energy Materials and Solar Cells, 144, 429 (2016). 4- A. Zyoud, R. S. Al-Kerm, R. Al-Kerm, W. Mansur, M. H. S. Helal, D-H. Park, N. Sabli and H. S. Hilal, Electrochimica Acta, 174, 472 (2015)

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 6 Influence of pressure on electrical properties of proton conductors M. Zdanowska-Frączek a, + aInstitute of Molecular Physics Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland, + Author for correspondence: [email protected] Proton conductors create pretty large family of materials which undergo a structural phase transition to a superionic state above certain temperatures

T=Ts characteristic for certain materials. This characteristic phase transition is accompanied by an increase in the conductivity by few orders of magnitude. One of the reasons for this phenomenon is the formation of a disordered hydrogen bond network in these structures. Recently, we carried out research on better understanding of the mechanism that control the formation of high conductive phases in hydrogen sulfate and selenate family crystals belonging to the class of crystalline solid acids. Superionic properties of this group of materials have attracted much interest due to their potential use as solid electrolytes in electrochemical devices, particularly in fuel cells. In the present contribution, the effect of various thermodynamic conditions on electrical transport phenomena is presented. The crystals are selected so that they could make model molecular systems for investigation of nonlinear effects in the process of charge transport related to subtle changes in the crystal structure and proton dynamics caused by external pressure. An interesting result is that effect of pressure on electrical properties of proton conductors depends on the shape of the molecules involved in the H-bonds which form the charge transport pathway in the crystal bulk. Keywords: impedance spectroscopy, electric properties, solid acids, high pressure technique

1- Ł. Lindner, M. Zdanowska-Frączek, A. Pawłowski, Z.J. Frączek, Journal of Applied Physics, 116, 16, 163513 (2014). 2- Ł. Lindner, M. Zdanowska-Frączek, A. Pawłowski, Z.J. Frączek, Solid State Ionics, 311, 26 (2017). 3 T. Masłowski, M. Zdanowska-Frączek, Ł. Lindner, Solid State Ionics, 306, 20 (2017).

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 7 Doping effect on macroscopic and nanoscopic electrical properties of BST and BZT thin films synthesized by sol-gel process A. Tachafinea,+, D. Fasquellea, R. Desfeuxb, A. Da Costab, J.-C. Carrua, A. Outzourhitc a Unité de Dynamique et Structure des Matériaux Moléculaires, Université du Littoral - Côte d'Opale, 50 rue Ferdinand Buisson, B.P. 717, 62228 Calais, France. b Unité de catalyse et de chimie du solide, Université d’Artois Faculté des Sciences Jean Perrin, rue Jean Souvraz SP 18 62307 Lens, France. c Nanomaterials Laboratory for Energy and Environment, Department of Physics, Faculty Semlalia, Cadi Ayyad University, Marrakech, BP 2390, 40000, Morocco

+ Author for correspondence: [email protected]

The study of dielectric and ferroelectric materials has enabled significant technological advances in electronics in recent years. The development of components such as resonators, capacitors, sensors, memories, tunable microwave devices, etc., has contributed significantly to developments and innovations in computing, microelectronics and telecommunications (satellite communication, mobile telephony, etc.) in both the military and civilian fields [1]. Fundamental and applied research in materials is therefore an important objective for the future. The current requirements are on two levels: a very strong integration of components and an increase in frequency caused in particular by the increasing congestion of the allocated frequency bands. New solutions are therefore to be considered through the search for new materials and/or new structures. In this sense, thin films derived from the ferroelectric material BaTiO3 continue to generate a lot of work for the development of integrated components for microelectronics such as flat capacitors, coplanar waveguides, tunable filters, etc [2]. In addition, current miniaturization requirements lead to the reduction of the size of components to dimensions below one micron. This has led to a strong interest in size effects and studies of the local ferroelectric and piezoelectric properties of materials. As such, near-field microscopy makes it possible to describe local properties at the micrometer and nanometer scale. Indeed, Atomic force microscopy (AFM) provides information on the surface morphology of materials in the form of films, their roughness, their growth modes, etc... Also piezoelectric force microscopy (PFM) makes it possible to map the architecture of ferroelectric domains and to measure, via local piezoelectric hysteresis cycles, the electromechanical deformations of the material with a resolution in the nanometer order. In this work, we present the development and study of materials with a dielectric permittivity tunable by DC voltage for applications in the field of microelectronics. These are thin films

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Ba1-xSrxTiO3 (BST) and BaZrxTi1-xO3 (BZT) synthesized by the sol-gel method and obtained by substituting the parent ferroelectric material BaTiO3 respectively at A sites with strontium and at B sites with zirconium. The electrical characterizations of the synthesized films were performed at both the nanoscopic and macroscopic scales. Macroscopic characterizations by impedance spectroscopy have made it possible to study the effect of composition on the structure, tunability, dielectric and ferroelectric properties of the films. The characterizations carried out at the nanoscopic level of a grain by AFM and PFM made it possible to study the effect of the composition on the deformation state and surface properties of the films and also to record local piezoelectric hysteresis cycles which provide information on the samples at the nanometric scale. This work is part of an international context that aims to exploit the physical properties of ferroelectric materials in the field of telecommunications in order to finalize an application such as that of tunable capacitors.

1- H. Ait Laasri, D. Fasquelle, A. Tachafine, N. Tentillier, L. C. Costa, M. Elaatmani, A. Outzourhit and J.-C. Carru, Functional Materials Letters (2018) Vol. 11, 2 2- M. Mascot, D. Fasquelle, G. Velu, A. Ferri, R. Desfeux, L. Courcot, and J. C. Carru, Ferroelectrics, (2008) 362, 79–86

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Talk 8 Ionicconductivity of BaO-doped8 mol% yttria- stabilizedcubic zirconia (8YSZ) Bülent Aktaşa, +, Süleyman Tekelib, Serdar Salmanc aHarranUniversity, EngineeringFaculty, Department of MechanicalEngineering, 63300 Sanliurfa, Turkey bGaziUniversity, TechnologyFaculty, MetallurgicalandMaterialsEngineeringDepartment, Teknikokullar, 06500 Ankara, Turkey cMarmaraUniversity, TechnologyFaculty, Department of MetallurgicalandMaterialsEngineering, Kadikoy, 34722 Istanbul, Turkey

+ Author for correspondence: [email protected]

The influence of 1-15 wt% BaO addition on the ionic conductivity of 8YSZ was investigated using impedance spectroscopy with a frequency response analyzer in the frequency range of 100 mHz-13 MHz and the temperature range of 300-800 oC. 8YSZ powder was doped with 1–15 wt% BaOusing a colloidal process. The pellet-shaped samples were produced by pressing at 200 MPa, and samples were sintered at 1400 C for 50 h. SEM and XRD results indicated that BaO could be dissolved in the 8YSZ matrix at 1 wt%, and it did not dissolve in the 8YSZ matrix at contents above 1 wt% (5, 10 and 15 wt%). This insoluble BaO reacted with ZrO2 at high sintering temperatures and formed

BaZrO3 secondary phases at the grain boundaries of 8YSZ.The grain interior conductivity of 8YSZ at 400oC was increased from 1.167x10-4 to 1.556x10-4 S/cm adding 5 wt% BaO, and also the grain boundary conductivity of 8YSZ at 400 oC enhanced from 7.209x10-6to 4.903x10-5 S/cm adding 1 wt%BaO. Inconclusion, it was found that BaO addition to 8YSZ improved the ionic conductivity and might be used as a solidel ectrolyte material in solid oxide fuelcells (SOFCs).

Keywords:8 mol% yttria-stabilizedcubiczirconia (8YSZ), BaZrO3,Impedancespectroscopy, Ionicconductivity, Solid OxideFuelCells (SOFCs)

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Talk 9 Dielectric analysis of interfacial polarization of Jute-carbon black hybrid composite materials A. Trikia, +, S. Larguecha, M. Ramachandranb and A. Kallela a Laboratory of composites materials, ceramics and polymers, Faculty of Sciences of Sfax, University of Sfax, BP 3018 Sfax, Tunisia. b MPSTME, SVKM’s NMIMS, Shirpur, Dhule, Maharashtra-425405, India.

* Author for correspondence: [email protected]

Global awareness of environmental issues has led scientists to develop a new generation of sustainable composite materials namely green composites. Despite of their numerous advantages, natural fibers/bio-resin adhesion issue still exists owing to the hydrophilic character of natural fibers. Addition of synthetic such as carbon black nano-powders into the green composites may enhance its mechanical properties. As these latter are depended on the interfacial adhesion, dielectric measurements are performed in order to probe this region by analyzing the interfacial polarization. In this study, dielectric measurements were performed on Poly(lactic acid) (PLA)/ Poly(butylene succinate) (PBS) blend matrix and its hybrid composites reinforced with jute fibers and carbon black fiber nano-powders in the frequency range from 10-1 Hz to 1 MHz and temperature range from 20°C to 140°C. Two hybrid green composites were analyzed. The relative weight fraction of the reinforcements (jute/carbon black) in each composite has a ratio of 38:1.5 and 38:2 for composites #1 and #2, respectively. This dielectric analysis revealed that the addition of jute fibers and carbon black fiber nano- powders into the PLA/PBS blend matrix gave rise to water dipoles polarization at low temperatures originating from the hydrophilic character of jute fibers and interfacial polarizations at high temperatures originating from the accumulation of charges at jute fibers/blend matrix and carbon black fibers/blend matrix interfaces. Analysis of interfacial polarizations according to Havriliak-Negami model revealed the effect of carbon black fiber nano-powders on jute fibers/blend matrix adhesion in accordance with its weight fraction.

Keywords : Jute fibers, green composite, PLA, carbon black fibers, interfacial polarization, hydrophilic character.

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Talk 10 Water Quality-Environmental Factors and Impact A. Vaseashtaa,+, Prof. Dr. aInternational Clean Water Institute, Manassas, VA USA NJCU – State University of New Jersey, NJ, USA and IEEN, Chisinau, MOLDOVA + Author for correspondence: [email protected];[email protected]; Clean water is fundamentally essential to sustaining life and supporting basic functions of human body such as homeostasis, maintaining equilibrium between exogenous and endogenous water, regulating metabolism and temperature and filtering out toxins. Gradual growth in population and its associated burden on water supply worldwide poses a significant challenge in maintaining adequate water quality. The presentation provides a global perspective of water-stressed areas (Harhay, 2011) and projections estimates using current trajectory of environmental factors on water consumption. We also summarize the maximum residue limits, maximum contaminants level and primary ecotoxicity effects on human health for selected agricultural pesticides - recognized as endocrine disrupting compounds, returned pharmaceuticals, metals, volatile organic compounds and other commonly used chemicals found abundantly in water supplies and streams. Current water filtration systems do not sufficiently mitigate some of the ―recent‖ contaminants, which did not exist in sufficient quantities a decade or so ago. Conventional methods use commercial- off the shelf systems and broad-spectrum analytical instruments with interpretive algorithms to sense/detect and characterize contaminants. Since contaminants differ greatly in chemical structure and chromatographic/spectroscopic behavior, it is extremely difficult, if not impossible, to apply generic methods to interrogate most contaminants in real-time. Several regulations have been implemented to control the use of several chemicals that are toxic to human health. We provide an overview of current regulations and a comprehensive sensor platform combined with GIS and IOT capability, as a part of Smart and Connected Communities project (Vaseashta et al, 2019), which is likely to provide information leading to efficient contamination mitigation strategies, policy framework for waste discharge consistent with local standards and regional conditions, enhanced water quality leading to better quality of life and better living standards, in general. This goal is consistent with millennium development goals of the United Nations Development Program. Furthermore, we provide an overview of new materials and technologies that will provide unforeseen capabilities to sense/detect multiple contaminants in label-free and highly multiplexed format, with ppb/ppt sensitivity, high selectivity and specificity, all in real-time. While clean drinking water is the

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main concern, it is prudent to address the growing demand for clean water needed for industrial sectors such as pharmaceuticals, power generation, hydrocarbon, catalysis, and chemical processing, mining, hydro-metallurgy and semiconductor processing.

Figure 1: Smart and

connected system of water monitoring 1- M. O. Harhay, Water Stress and Water Scarcity: A Global Problem, Am J Public Health. 2011 August; 101(8): 1348–1349. 2- A. Vaseashta, Cyber-Physical Systems—Nanomaterial Sensors Based Unmanned Aerial Platforms for Real- Time Monitoring and Analysis, 4th International Conference on Nanotechnologies and Biomedical Engineering, December 2019.

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Talk 11 Application of scanning nonlinear dielectric microscopy for various piezoelectric domain structure measurement H. Odagawaa,+ aNational Institute of Technology, Kumamoto College, 2659-2 Suya, Koshi-shi, Kumamoto 861-1102, Japan + Author for correspondence: [email protected]

Piezoelectric materials includingZnO, AlN, LiNbO3, LiTaO3, PZT are widely used in ultrasonicdevices such as surface acoustic wave and bulk acoustic wave filters, sensors, actuators and soon. Recently, the use of polarity-inverted structureshas beenapplied to the devices toimprove device performance, and the measurement of these structures has become an important research subject. Scanning nonlinear dielectric microscopy (SNDM) [1] is a purely electrical technique for measuring the polarity distribution of piezoelectric or ferroelectric materials. This paper describes several measurement techniques that apply SNDM to piezoelectric domain structures.In particular,measurement techniques for multilayer structures and dynamic measurement technique will be described. In multilayer measurement, the principle of determining the thickness of multilayer isexplained with some experimental results. In dynamic measurement, a system that observesthe domain motion of piezoelectric ceramics with a driving voltage applied will be explained withexperimental results. 1- Y. Cho, A. Kirihara and T. Saeki, Rev. Sci. Instrum. 67, 2297 (1996).

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Talk 12 Green Synthesis and Characterization of Zinc Oxide Nanoparticles: the effects of plant extracts and zinc salts A. A. Barzinjya,b a Department of Physics, College of Education, Salahaddin University-Erbil, Kurdistan Region, Iraq b Department of Physics Education, Faculty of Education, Tishk International University, Erbil, Kurdistan Region, Iraq + Author for correspondence: [email protected] In continuation of our recent works regarding green synthesisnanomaterials [1-5], here we investigate an active and easyprocess of one-pot green productionof This study consist of a reliable process for synthesizing ofZnO NPs by green method.Here eight different plant extract utilized as an efficient chelating and - capping agent. The impacts of dissimilar anionic species (C2H3O2 - and NO3 ) on the morphologies, structures and size of the obtained ZnO nanoparticles have been reported. The plant ingredients, structure, morphology, thermal behavior, chemical composition and optical properties of ZnO nanoparticles were investigated utilizing numerous characterization procedures, namely XRD, DLS, FE-SEM, EDX, BET, Differential scanning calorimetry (DSC) analysis, FT-IR analysis and UV–Vis spectroscopy. The UV-Vis and FTIR analysis of plant extracts verified that theses extracts are promising candidate for biosynthesizing ZnO NPs. The XRD spectrum and the SEM images confirmed the crystallinity and the different shape of the ZnO NPs with different size between in the range of nanoparticles. The band-gap of the produced ZnO NPs were computed for all cases. DSC analysis exhibits two endothermic peaks, related to the water evaporation absorbed by the NPs and modification of zinc complex to zinc hydroxide, with a single exothermic peak related to the crystallization of ZnO NPs and degradation of organic materials. In general, the biosynthesized ZnO nanoparticles obtained from zinc acetate often display nanorods crystalline structure, while those obtained from zinc nitrate often display tetrahedrons crystalline nature. Keywords: Biosynthesis method of NPs; ZnO NPs, Malva sylvestris; zinc acetate dihydrate; zinc nitrate hexahydrate.

1- M. Nasrollahzadeh, M. Sajjadi, M. Maham, S. M. Sajadi, and A. A. Barzinjy. Materials Research Bulletin, 102 (2018) 24-35. 2- S. M. Sajadi, K. Kolo, S. M. Hamad, S. A. Mahmud, A. A. Barzinjy, and S. M. Hussein,. ChemistrySelect, 3 (2018) 12274-12280. 3- A. Barzinjy, S. Mustafa, and H. Ismael. EAJSE, 4 (2019) 74-83. 4- D. Zhao, M. Hedayat, A. A. Barzinjy, R. N. Dara, A. Shafee, and I. Tlili. Journal of Molecular Liquids, 293 (2019) 111537.

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5- Q. Pu, M. Jafaryar, S. M. Hamad, A. A. Barzinjy, A. Shafee, E. Abohamzeh, and I. Tlili. Physica A: Statistical Mechanics and its Applications, (2019) 123038.

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Talk 13 Effective Parameters Extraction of Metamaterials based on Split-Ring Resonators R. Chaynane a, +, N. Jebbor b, S. Bri c, A. El Abbassi b

a Faculty of Applied Sciences, Ibno Zohr University, Ait Melloul-Agadir 80000, Morocco b Electronics, Instrumentation and Physical Measurements, Moulay Ismail University of Meknes, Faculty of Sciences and Technics-Errachidia 52000, Morocco c MIN, Electrical Engineering Department, ESTM, Moulay Ismail University of Meknes Meknes 50000, Morocco + Author for correspondence: [email protected]

Metamaterials are periodic artificial composite materials structured on a sub-wavelength scale. The most interesting physical characteristic of these materials is the negative refractive index. In ordinary materials, permittivity and permeability are positive, while metamaterials may have negative permittivity or permeability or both [1,2]. In this article, a method for recovering accurately the effective parameters based on the determination of transmission and reflection S-parameters is presented. The structure under study consists of a substrate composed of a dielectric and several metallic split-ring resonators arranged periodically. The free space ports for excitation and detection of electromagnetic wave are assumed to be aligned in the direction of normal incidence to the metamaterial cell. These S-parameters allow determining all the effective parameters (permittivity, impedance, permeability, refractive index and the magneto-electric coupling coefficient) by using analytical models, that explicitly depend on these S-parameters and which also allow a good extraction of these effective parameters under certain conditions [3,4]. The variation of the resonance frequency and the amplitudes of the effective parameters in relation to the geometrical parameters are illustrated. The results also show the structure based on thinner resonators has a lower resonance frequency. Resonance increases as amplitudes decreases. We also noted that the structure has a high magneto-electric coupling coefficient, and proves her bi-anisotropic character. This bianisotropy affects all other effective parameters. Tailoring and retrieving accurately the electromagnetic properties of the analysed bianisotropic metamaterial slabs are of extreme importance for further development of new microwave antennas and filters.

Keywords: Metamaterial, Split Ring resonator, Refractive Index, Magnetoelectric coupling coefficient. 1- Y. Gupta, S. Joshi, N. Munjal,Y.K. Awasthi, H. Singh, ‗‘Progression of Metamaterials: Brief Classification‘‘, International Journal of Innovative Research in Computer and Communication Engineering, 4, (2016).

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2- H. Kishore, V. Teja, D. Prasad, M. Rao, ‗‘Metamaterial unit cell structure‘‘, International Journal of Recent Trends in Engineering&Research, (2017). 3- A. Hindy, M. ElSagheer, M. S. Yasseen, ‗‘A Circular Split Ring Resonator (CSRR) Left Handed Metamaterial (LHM) having Simultaneous Negative Permeability and Permittivity‘‘, International Journal of Hybrid Information Technology 10, (2017) 4- R. Xavier, R. Serres, G. da Costa,C. A. Costa, L.Augusto,V. Cesarino, ‗‘Design and Application of a Metamaterial Superstrateon a Bio-Inspired Antenna for Partial Discharge Detection through Dielectric Windows‘‘,Sensors,19, (2019)

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Talk 14 A simple Analysis of Complex Impedance Measurements Fathy Salman a,+ a Faculty of Science,Banha University, Egypt. + Author for correspondence: [email protected]

The principle of the impedance analysis method is based on measurements of the sample impedance taken over a wide range of frequencies and then analyzed in the complex impedance plane. The method was firstly applied to solid electrolytes problems by Blauerle.The main definitions of the quantities related to impedance are reviewed. Impedance of various circuit elements are calculated and plotted on complex plane and represented with equivalent circuits. The capacitance and resistance have been evaluated from impedance data at the various frequencies to obtain formulas of dielectric constants and ac conductivity. Data of dielectric constants and the ac conductivity are represented. The most common impedance and dielectric plots are given.

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Talk 15 Using Polystyrene Nano layers as a Coating Material for Field Electron Emission metallic and semiconducting Cathodes Marwan S. Mousa+ Surface Physics and Materials Technology lab, Dept. of Physics, Mutah University, Al-Karak 61710, Jordan + Author for correspondence: [email protected]

This study is about using an insulator layer of Polystyrene as a coating material for Tungsten (W) and Carbon Fiber (CF) tips in field electron emission (FEE) from single field emitters experiments. The base sample tip were prepared using the electrochemical etching process [1] and then being carefully vertically dipped [2] into a solution of Polystyrene – Toluene in order to create the coated samples. The coated Tungsten and Carbon Fiber tips were then installed in the locally built field emission microscope (FEM) under high vacuum (HV) conditions [3]. The current – voltage (I – V) characteristics were recorded and then analyzed using the Fowler – Nordheim (FN) and Murphy – Good (MG) plots. The study also includes studying the tip profile using the scanning electron microscope (SEM) and the field emission microscope to record the pattern images. The changes that occur, before and after the coating process, has been studied and comparison of the results has been carried out. Using Polystyrene, as a coating material, showed significant improvement in the recorded emission current values and the threshold applied voltage, for both Tungsten and Carbon Fiber samples. Improvement has been more significant for the coated W-core material

References 1. R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys., 19, 699 (1986). 2. M. S. Mousa, Surf. Sci. 94/95, 129 (1996). 3. M. S. Mousa., Surf. Interface Anal., 39, 102 (2007).

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Talk 16 Diamond nanostructures for photonic and sensor applications N. Felgen, A. Schmidt, J. Heupel, J.P. Reithmaier, C. Popov + Institute of Nanostructure Technologies and Analytics (INA), Center of Interdisciplinary Nanostructure Science and Technology (CINSaT), University of Kassel, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany + Author for correspondence: [email protected]

Diamond is a material with a number of outstanding mechanical, optical, electrical and chemical properties. In the last decade it has additionally attracted the attention of scientists due to the promising properties of the color centers in its crystal lattice such as the nitrogen-vacancy (NV) and the silicon-vacancy (SiV) centers which can find applications in quantum information technology or quantum sensing on nanometer scale. In order to increase the collection efficiency of the photons emitted by the color centers they should be incorporated in photonic structures. We demonstrated the fabrication of nanopillars with diameters down to 50 nm in nanocrystalline diamond (NCD) films [1] and monocrystalline diamond [2] by electron beam lithography (EBL) and inductively coupled plasma reactive ion etching (ICP-RIE) with oxygen. NV color centers were incorporated in the diamond nanopillars by introduction of nitrogen in the gas phase during the growth of the NCD film [3] or by ion implantation in monocrystalline diamond prior the structuring. The SiV centers were introduced in the diamond crystal lattice by short overgrowth of already structured nanopillars incorporating Si atoms etched from the substrate between the pillars [4]. In order to reduce the photon scattering from the rough NCD surface we developed a planarization technique which significantly reduced the surface roughness [2]. Furthermore, we demonstrate the first steps for fabrication of 2D photonic crystals in NCD membranes. For this purpose the NCD films were grown on sacrificial SiO2 layer. After planarization of the surface the 2D photonic crystals were fabricated by EBL and ICP-RIE, followed by wet chemical etching of the sacrificial oxide layer for the formation of the membrane [5]. In a similar way the photonic structures, e.g. the nanopillars, can be prepared on a NCD membrane structure [6]. Additionally, the NV center is a promising candidate for applications in quantum sensing on a nanoscale. Incorporating such centers in sharp diamond tips, allows the fabrication of a controllable sensor for magnetic and electric fields. We demonstrate the fabrication of bottom-up NCD probes with tip radii in the range of ca. 25 nm, and top-down fabricated NCD AFM probes with tip radii even below 10 nm.

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Keywords: Diamond, Color Centers, Nanofabrication, Photonic Structures, AFM tips 1- E. Petkov, T. Rendler, C. Petkov, F. Schnabel, J.P. Reithmaier, J. Wrachtrup, C. Popov, W. Kulisch, Phys. Stat. Sol. A 210, 2066 (2013). 2- N. Felgen, B. Naydenov, F. Jelezko, J.P. Reithmaier, C. Popov, Phys. Stat. Sol. A 215, 1800371 (2018). 3- E. Petkov, C. Popov, T. Rendler, C. Petkov, F. Schnabel, H. Fedder, S.-Y. Lee, W. Kulisch, J.P. Reithmaier, J. Wrachtrup, Phys. Stat. Sol. B 250, 48 (2013) (Cover story paper). 4- N. Felgen, B. Naydenov, S. Turner, F. Jelezko, J.P. Reithmaier, C. Popov, Diamond Relat. Mater. 64, 64 (2016). 5- J. Heupel, N. Felgen, R. Merz, M. Kopnarski, J.P. Reithmaier, C. Popov, Phys. Stat. Sol. A, DOI: 10.1002/pssa.201900314 (2019). 6- A. Schmidt, J. Bernardoff, K. Singer, J.P. Reithmaier, C. Popov, Phys. Stat. Sol. A, DOI: 10.1002/pssa.201900233 (2019).

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Talk 17 Cluster modeling approach of hydroxylated compounds [Nb2O5]n with (n=2,5,6) coordinated to glucose and cysteine probing Inhibition Activities H. Rabaa a,b,c*, N. Ait Biada , G.Andriyc, S. Dagec a Dept. of Chem., Ibn Tofail University, P O Box 133, 14000 Kenitra, Morocco. bDept. of Chem., University of North Texas, Denton, TX 76203. cDept. of Chem., University of Helsinki, P.O. B. 55, FIN-00014, Finland. + Author for correspondence: [email protected]

The gas-phase reactivity of hydoxylated [Nb2O5] oxides towards glucose and cysteine has been investigated by means of density functional theory (DFT) calculations. Three model cluster metal oxides were used and give rise to the formation of quite different reaction products. In distinct contrast, for the couple

[Nb2O5]/Glycose, one observes only single and double hydrogen- atom abstraction from the glycose. DFT calculations reveal that different modes of attack in the initial phase of O-H-Cysteine bonds together with quite different bond-formation energies of the M-O bonds cause the rather varying reactivity of [Nb2O5] towards Glycose.

The hydoxylated generation of Cysteine from [Nb2O5] may provide mechanistic insight in the related antimony-catalyzed large-scale process better than Sb2O5. Quantum chemistry analyses were used to probe their efficiency towards inhibition process in treating Leishmania Diseases and energie barrieres were estimated.

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Talk 18 Energy Harvesting Technologies in Wireless Sensor Networks (EHT-WSN): A Review S. Ehlalia,+, A.Sayaha aLaboratory of Mathematics, Computing and Applications – Information Security (LabMIA- SI) Faculty of Sciences, University of Mohammed V-Agdal. BP.1014 RP. Rabat, Morocco + Author for correspondence: [email protected]

Wireless Sensor Networks (WSN) have largely integrated all areas, includingmilitary and civil fields. The major constraint of these networks resides in their very limited energy resources supplied by the batteries of their nodes. Research into the development of new energy management techniques for these autonomous systems has established a classification into two strategic categories of energy management. A ―Software‖ category oriented towards designing and developing algorithms of routing protocols [1,2,3] in which shortor long ranges transmission solutions are adapted (IEEE.802.15.4, BLE,LoRa,…) to make transmissions more smart and energy efficient. Also, a "Hardware" category, which increasingly targets new energy recovery technologies [4, 5, 6, 7]. WSN with energy harvesting technologies (EHT-WSN) have attracted the attention of many academicians and industrialists since the ability to collect ambient energy allows more sustainable operation of sensor nodessuch as those conditioned by real time. In this paper, we carry out a study on the different sources of energy recovery in WSN and their various fields of application. The renewable energy recovery techniques, which are covered in this work, are radio frequency energy collection, solar energy, piezoelectricity and wind energy while each have their own characteristics. This choice is not exhaustive and it is motivated by the availability of these resources as well as their wide spectrum of industrial or other applications. The purpose of this study was to provide a current analysis of the work in WSN with energy harvesting (EHT-WSN) and to propose some approaches to future prospects for energy recovery in wireless sensor networks. In consideration of this works we propose, it would be more appropriate and judicious that an adjusted compromise be taken into account between the ''Software'' and ''Hardware'' designs of wireless sensor networks in order to optimize the energy consumption and consequently the life span of the network.

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Keywords: Energy Harvesting Technologies, WSN, RF, solar energy, piezoelectricity, wind energy

1- W.R. Heinzelman, A. Chandrakasan, H. Balakrishnan. An Application-Specific Protocol Architecture for Wireless Micro-sensor Networks. IEEE Transactions on Wireless Communications, Vol. 1(4), 660-670. October 2002. 2- S. Ehlali, A. Sayah, A. A clustering technique based on energy balancing algorithm for routing in wireless sensor networks. Journal of Theoretical and Applied Information Technology. Vol. 50, no. 1, 2013 3- S. Ehlali, A. Sayah, A. Efficient lifetime maximization data gathering technique for routing in wireless sensor networks. Applied Mathematical Sciences, HIKARI. Vol. 8, no. 28, 1381-1389, 2014 4- F. K. Shaikh, S. Zeadally. Energy Harvesting in Wireless Sensor Networks: A Comprehensive Review. Renewable and Sustainable Energy Reviews, 55, 1041-1054, 2016. 5- S. Priya, H. C. Song, Y. Zhou, R. Varghese, A. Chopra, S.G. Kim, I. Kanno, L. Wu, D.S. Ha, J. Ryu. A Review on Piezoelectric Energy Harvesting: Materials, Methods, and Circuits. Energy Harvesting and Systems, 4(1), 3-39, 2017. 6- U. Baroudi. Management of RF Energy Harvesting: A Survey. 16th International Multi-Conference on Systems, Signals & Devices (SSD), 44-49, Istanbul, Turkey, 2019. 7- L.Grasböck, A.Humer, M. Nader, M.Schagerl, D. Mayer, M. Misol, C.Humer, S. Herold, H. P.Monner. Wireless Sensor Networks and Energy Harvesting for Energy AutonomousSmart Structure. COMET-K2 Center of the Linz Center of Mechatronics (LCM) funded by the Austrian federal government and the federal state of Upper Austria. Mai 2019.

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Talk 19 Nanocrystal Coupled Systems for Energy and Charge Transfer Processes CN Dibenedetto,a,bA. Panniello,b E. Fanizza,a,bIngrosso,bA. Agostiano,a,b C. ML Curri,a,b , M. Striccolib,+ aDepartment of Chemistry, University of Bari bCNR-IPCF Bari, Italy + Author for correspondence:[email protected]

A growing interest has recently been devoted to the synthesis and organization of nanostructured materials. In nanoscopic regime, the electronic properties can be tuned by varying the physical size of the crystal, leading to new phenomena, as size-dependent optical transitions in semiconductor quantum dots (QDs), interesting for device applications. QDs synthesized by solution chemistry routes represent potential building blocks for inexpensive manufacturing of low cost and large area devices. Currently, intensive research has focused on the fabrication of QDs based organized meso and hybrid structures in solid state, which have shown new properties due to the collective interactions of nanoparticles or at the interface with molecular dyes. In particular, QDs with controlled size and shape, coupled and/or functionalized with suitable organic chromophores demonstrated efficient energy transfer (ET) and charge transfer (CT) processes [2]. Here, systems of QDsconjugated with organic dyes or coupled with other nanocrystals have been investigated to understand the transfer phenomena occurring at organic/inorganic interfaces in both ET and CT processes The obtained results demonstrate as the control of the geometric parameters of the nanoparticlesand dyes can strongly influence the transfer rate and the coupling efficiency among the nano-objects and, then, their electronic properties, with possible relapse in photonic or optoelectronic application.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 20 Colloidal nanomaterials: engineering surface chemistry for life science applications N. Depaloa, E. Fanizzaa,b, F. Vischioa,b, F. Rizzia,b, R. Comparellia, C. Ingrossoa, A. Pannielloa, A. Agostianoa,b, M. Striccolia, M. L. Curria,b,+ aCNR IPCF - Consiglio Nazionale delle Ricerche, Istituto per i Processi Chimico Fisici - Bari, Italy and bDipartimento di Chimica, Università degli Studi di Bari A. Moro, Italy and + Author for correspondence: [email protected]

In the last years, the extraordinary advances in the field of material science and in nanomaterial synthesis have resulted in a great potentialfor applications in life science. A variety of preparative and post- preparative colloidal routes have demonstrated able to obtain a wide choice of inorganic nanoparticles (NPs) and nanocrystals (NCs), with different compositions, that can be achieved with a high control on size, shape and surface chemistry, ultimately tailoring their electronic, optical, magnetic, thermal and chemical size dependent properties. In particular, a variety of functionalization strategies have been developed to suitably engineer the surface of NPs and NCs and tune their specific chemical reactivity towards the surrounding environment. The control of nano-bio interfaces has demonstrate essential to enable nanomaterials conjugation and combination with biologically relevant entities, thus producing advanced materials for diagnostics and therapy. The ability of engineering the surface of specialized nanomaterials, such as semiconductors, plasmonic and magnetic nanostructures, with tailored procedures, allows to ingeniously combine NPs and NCs with peptides, drugs and other significant biological systems, thus resulting decisive for their application in diagnosis and treatment of different diseases, including cancer and neurodegenerative disorders. In particular, examples of drug delivery, labelling, diagnostic and theranostics systems, based on NIR photoactive nanomaterials, plasmonic nanostructures and magnetic NPs will be reported. 1- F. Vischio, E. Fanizza, V. De Bellis, T. Sibillano, C. Ingrosso, C. Giannini, V. Laquintana, N. Denora, A. Agostiano, M. Striccoli, M. L. Curri, N. Depalo ―Near-infrared absorbing solid lipid nanoparticles encapsulating plasmonic copper sulfide nanocrystals‖ (2019) J. Phys. Chem. C, 124, 37, 23205-23213. 2- C. Ingrosso, M. Corricelli, F. Bettazzi, E. Konstantinidou, G. V. Bianco, N. Depalo, M. Striccoli, A. Agostiano, M. L. Curri, I. Palchetti ―Au nanoparticle in situ decorated RGO nanocomposites for highly sensitive electrochemical genosensors‖ (2019) J. Mater. Chem. B., 7, 768-777 3- N. Depalo, M. Corricelli, I. De Paola, G. Valente, R. M. Iacobazzi, E. Altamura, D. Debellis, D. Comegna, E. Fanizza, N. Denora. V. Laquintana. F. Mavelli. M. Striccoli, M. Saviano, A. Agostiano, A. Del Gatto, L. Zaccaro, M. L. Curri ―NIR emitting nanoprobes based on cyclic RGD motif conjugated PbS quantum dots for integrin-targeted optical bioimaging‖ (2017) ACS Applied Materials and Interfaces, 9 (49), 43113–43126.

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4- N. Depalo, R. M. Iacobazzi, G. Valente, I. Arduino, S. Villa, F. Canepa, V. Laquintana, E. Fanizza, M. Striccoli, A. Cutrignelli, A. Lopedota, P. Porcelli, A. Azzariti, M. Franco, M. L. Curri, N. Denora ―Delivery nanoplatforms based on sorafenib and superparamagnetic iron oxide nanoparticles for magnetically targeted therapy of hepatocellular carcinoma‖ (2017) Nano Research 10, 2431–2448. 5- G. Valente, N. Depalo, I. de Paola, R. M. Iacobazzi, N. Denora, V. Laquintana, R. Comparelli, E. Altamura, T. Latronico, M. Altomare, E. Fanizza, M. Striccoli, A. Agostiano, M. Saviano, A. Del Gatto, L. Zaccaro, M. L. Curri ―Integrin targeting with peptide bioconjugated to semiconductor-magnetic nanocrystalline heterostructures‖ (2016) Nano Research, 9, 644-662. 6- E. Fanizza, R. M. Iacobazzi, V. Laquintana, G. Valente, G. Caliandro, M. Striccoli, A. Agostiano, A. Cutrignelli, A. Lopedota, M. L. Curri, M. Franco, N. Depalo, N. Denora ―Highly selective luminescent nanostructures for mitochondria imaging and targeting‖ (2016) Nanoscale, 6, 3350-3361.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 21 Advanced 2D materials and their applications M. Khenfouch Africa Graphene Center, Physics department, Eureka building, CSET, UNISA-Florida Campus, Roodepoort, 1709 Gauteng, South Africa

+ Author for correspondence: [email protected]

Advanced 2D materials show their potential in a wide range of applications. Nowadays, they are universally known as promising candidates. This talk presents an introduction to these materials, including nanohybrids and nanosystems and their role in the efficiency of devices and applications. Moreover, the main physical properties of a collection of 2D nanosystems will also be discussed.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 22 Nanotechnology approaches in solar energy, laser and general photonics materials N. Kamanina a,b,+ a Vavilov State Optical Institute, Kadetskaya Liniya V.O., dom.5, korpus 2, St.- Petersburg, 199053, Russia. b St.-Petersburg Electrotechnical University (“LETI”), ul.Prof.Popova, St.- Petersburg, 197376, Russia + Author for correspondence:[email protected]

It is well known that in the previous century the materials have been basically divided according to their electro-conducting properties, taking into account the changes in the dielectric constant and in the charge carrier‘s mobility. But recently, due to the wide application of the laser instruments in the material properties modification and the effective use of the fullerenes and other nanoobjects in the material features study, namely the spectral and refractive characteristics are dominant. Some way to reveal the materials parameter change is presented in Fig.1.

Fig.1. Qualitative view of possible studies of materials parameters using different methods

Dramatic change of the spectral parameters and refractive properties can be found via nanotechnology approach. It should be noted that in the nanoscale region there is a clear correlation between the spectral, structural, mechanical and refractive properties of the materials. This correlates with the optoelectronics request as a whole. Really, it should be mentioned that rapid development of the optoelectronic devices, solar cells, and laser techniques poses an important task of creating and studying, from one side, the structures capable of effectively absorbing, converting, modulating, and recording of the optical processing data in a wide range of the radiation energy densities and frequencies, from

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another side, the new schemes and approaches capable to activate and to simulate the modern features of the materials not only in the general photonics but in the biomedicine as well. Thus, the optoelectronics materials have the promising place to resolve most complicated technical tasks. In this direction, as a rule, laser methods and nanostructuration process are most perspective to be used. In the current paper the two aspects in the area of the solar energy, laser and general photonics materials properties optimization will be discussed. The first one is connected with the IR-laser oriented deposition technique use in order to improve the transparency, mechanical hardness and wetting angle of the inorganic systems operated in the UV-VIS-IR spectral ranges. The comparative results will be shown for the Ge, Si, Sc, ZnS, Al, ITO, etc. materials. As the effective nanoobjects the carbon nanotubes are considered. Using the innovative laser structuration approach and forming the coinciding conditions between the carbon nanotubes (with the little refractive index n of ~1.1 and diameters close to 0,3-0,7 nm) and the materials lattice parameters, the Fresnel loses via the reflection can be changed in one order of magnitude, at least. Moreover, the microhardness and wetting angle can be essentially increased. Experimental results are supported with the analytical and quantum-chemical simulations. The established tendency of the materials hidrophilic features change to the hydrophobic one has been recently shown in the paper devoted to detailed study, for example, of the KBr structures [1]. The second one will be connected with the doping process influence on the refractive and the photoconductive parameters of the organic systems. In this case the most important characteristic of the organic materials is the induced dipole, whose can be expressed through dipole polarizabilities (n). These are in turn related by the proportional dependence to the nonlinear susceptibility (n) and to the local volume  of the materials (media). Thus, laser- matter interaction provokes the change in the polarization of the media and predicts the change in the important properties, such as the dynamic, photorefractive and photoconductive ones. The comparative results will be shown for the doped polyimides, pyridine, polyaniline, etc. materials. As the effective nanoobjects in this case the fullerenes, shungites, reduced graphene oxides, quantum dots, etc. nanoobjects have been applied. The four-wave mixing technique has been used in order to reveal the laser induced change of the refractive index of the doped materials. Moreover, AFM method and visualization of the surface relief change due to the change of the content of the nanoobjects in the materila body are testified. The established tendency of the materials spectral features change due to the interface relief structuring for the liquid crystal (LC) matrixes doped with the lanthanide nanoparticles, for

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example, has been recently shown in the paper devoted to detailed study of the LC structures [2]. 1- N.V.Kamanina, etc. ―Advantages of the Surface Structuration of KBr Materials for Spectrometry and Sensors‖, Sensors 2018, 18(9), doi: 10.3390/s18093013 2- N. V. Kamanina, etc., ―Control of the IR-spectral shift via modification of the surface relief between the liquid crystal matrixes doped with the lanthanide nanoparticles and the solid substrate‖, Optics Express, Vol. 24, No. 2, 6 pages, 2016.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 23 Effect of Porous Silicon Carbide on Resonant Coupled Modes in a Multilayer Sensor B. Bouhafsa,+, M. Bouhafsa, A. Cherifia, M. Bendjebboura aUniversity of Tlemcen, Faculty of Sciences, Theoretical Physics Laboratory-Tlemcen 13000, Algeria. + Author for correspondence: [email protected]

Recent research interest, on optical properties of materials and method leading to manipulate the nanoscale response of resonant structures, is relevant for the potential application in tunable and configurable optical sensors. Otherwise, to quantify fundamental features resulting in the optical coupling between incident photons and surface plasma oscillations, along resonant structures, various types of metallo-dielectric interfaces were intensively investigated. Thus, in the interest of enhancing significantly the sensitivity of the occurred transfer energy, in consequence, the advantages of graphene and MoS2 layers were already been highlighted in several papers. In this contribution, we focus on other materials to enhance the surface sensitivity of a designed biosensor which shown the ability of exhibiting electromagnetic field generated during the coupling process. To solve the sensitivity issue, porous silicon carbide (p-SiC) layer has been considered between a glass-substrate of high refractive index and a nano-structured cavity; i.e., three stacked layers referred as MIM configuration). However, to highlight the effect of external parameters like incident light, polarization, and porosity, the response of the above configuration is simulated by the transfer matrix formalism. The absorbent gap: p-SiC is described according to the effective index theory (EIT). Thus, to evaluate the overall limit on the sensitivity, retrieved from the angular- response probed on the sensing device, two types of porosity as high as 0.5 are examined. For this theoretical analysis, the whole of thicknesses of the structure ‗media are turned in the sub- wavelength scale and the sensitivity was determined on both the change of refractive index of the sensing medium, I (surrounded by active materials) and its layer thickness. Finally, according to the results described on the electromagnetic field, the multilayer sensor, based on the property of p-SiC, can be used as a sensing platform to probe interface phenomena.

Keywords: Resonant Structure, Effective medium Theory, Sensitivity Enhancement, Subwavelength Scale, Sensing Device. 1- Shalabney, and al, Sensitivity of surface Plasmon resonance sensors based on metallic columnar thin films in the spectral and angular interrogations, Sensors and Actuators B 159 (2011), 201-212. 2- Qingling Ouyang, and al, Sensitivity enhancement of MoS2 nanosheet based surface Plasmon resonance biosensor, Procedia Engineering 140 (2016), 134-139. 3- A. Cherifi, and B. Bouhafs, Potential of SPR sensors based on multilayer interfaces with gold and LHM for biosensing applications, Photonic Sensors, Vol. 7, N°3(2017), 199-205.

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4- A. Cherifi, and B. Bouhafs, Sensitivity enhancement of a surface Plasmon resonance sensor using prous metamaterial layers, Mater. Res. Express 4(2017) 125009. 5- S. Agarwal and al, Effect of surface roughness on the performance of optical SPR sensor for sucrose detection: Fabrication, characterization and simulation study, IEEE Sensors Journal, (2016). 6- S. Fouad and al, Surface Plasmon resonance sensor sensitivity enhancement using gold-dielectric material, Int. J. Nanoelectronic and Materials, 10(2017), 149-158.

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 24 Lithium-ion Batteries as convenient technology for Energy Storage: The case of phosphates I. Saadoune IMED-Lab., FSTG, Cadi Ayyad University, Marrakech, Morocco + Author for correspondence: [email protected]

Battery technologies are set to play a key role in the worldwide energy strategy for reducing the CO2 emissions and reducing human impact on climate change. Therefore, significant attempts have been made to overcome this environmental challenge and to track high-energy power source devices in the past decades. Among them, lithium-ion batteries (LIBs) have been considered as one of the most appealing candidates as they are providing high energy and power densities. Nevertheless, Safety is one of the big challenges for the development of this energy storage technology. To overcome this issue that is mainly caused by the cathode materials based on layered oxides, phosphates with the well-known NASICON structure were widely proposed. These phosphate materials provide attractive properties such as the high ionic conductivity and good structural stability. They are considered as very promising materials for use as electrodes for lithium (LIBs) and sodium (NIBs) ion batteries. Herein, two new high-performance electrode material were synthesized via the sol-gel method and were electrochemically tested as an anode for lithium ion batteries proving enhanced electrochemical performance [1-2]. Keywords: Lithium-ion Batteries, Phosphates, Energy Storage

1. M. Srout, M. N. H. Kwon, W. Luo, A. Züttel, K. M. Fromm, I. Saadoune, ChemSusChem 2019, 12, 1 – 9 2. M. Srout, N.M. Lee, H. Ben Youcef, N. Semlal, K. M. Fromm, I. Saadoune, ACS Appl. Mater. Interf., accepted (2020)

Acknowledgements: The authors would like to thank OCP Foundation for the financial support through APPHOS program.

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Talk 25 Using PTCR effect for industrial applications L. C. Costaa,+, M. El Hasnaouib, M. E. Achourb a I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal b LASTID, Faculté des Sciences, Université Ibn Tofail, 14000 Kénitra, Morocco + Author for correspondence: [email protected]

Some materials display an abrupt increase in the resistivity when the temperature changes only over a few degrees. This phenomenon, known as positive temperature coefficient in resistivity (PTCR), has been largely studied, due to its potential applications in industry. Particularly, it can be used in auto-controlled heaters and in security systems for electronic circuits. If there is a short circuit in an electric circuit, the increase of the temperature by Joule effect induces an increase of the resistivity and consequently a decrease in the electrical current. In this talk, two case studies will be discussed. The first one presents a styrene-butadiene rubber polymer matrix, doped with carbon black particles. With 12% (w/w) of conducting particles, the percolation critical concentration was attained. Then, this composite was doped with paraffin particles encapsulated by a crosslinked gelatin. The melting point of paraffin is about 50 ºC, that is, at this temperature, the phase transition promotes an effective dilatation of about 10%, sufficient to interrupt the percolation path, with the consequent increase of resistivity. The second one presents ethylene butylacrylate copolymer composite, doped with carbon black particles. The PTCR effect was observed at temperatures slightly above room temperature, for concentrations higher than the percolation critical concentration, due to the swelling of the material. In both cases, the obtained results show that these materials have a high potential for industrial applications.

Keywords: PTCR effect, electrical properties.

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Talk 26

Synthesis of lithium ferrites nanoparticles by biogenic method S. Soreto Teixeira,a+ A. J. M. Sales,a M. P. F. Graçaa, L. C. Costaa a i3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal. + Author for correspondence: [email protected]

Cubic and ferrimagnetic spinel ferrite LiFe5O8 (LFO) has interesting properties, such as high Curie temperature, square hysteresis loop and high magnetization [1]. Therefore, it is an attractive material to be used in several applications such as microwave devices, in rechargeable lithium batteries as a cathode material [2,3], magnetic recording, transformer cores, rod antennas and in the biomedical field [4].

In this work, LiFe5O8 crystallites were obtained by proteic sol-gel process, where lithium and iron nitrates were employed as raw materials and dissolved in coconut powder (Cocos nucifera L.) solution. The obtained powders were dried and heat-treated (HT) at temperatures between 600 and 1000 ºC. Their structure and surface morphology were achieved by X-ray diffraction and scanning electron microscopy. The dielectric properties were measured in the frequency range between 100 Hz and 1 MHz and temperatures between 200 and 360 K. The results vary from ε‘≈10; ε‘‘≈3.2; tan δ≈0.3, for sample HT600 ºC to ε‘≈14; ε‘‘≈4.6; tan δ≈0.3 for sample HT1000 ºC and were related with the structure and morphological characteristics.

Keywords: Lithium ferrite, dielectric properties, sol-gel 1- M. N. Iliev, V. G. Ivanov, N. D. Todorov, V. Marinova, M. V. Abrashev, R. Petrova, Y. Q. Wang, and A. P. Litvinchuk, Phys. Rev. B 83, 174111 (2011). 2- Y. T. Lee, C. Yoon, Y. S. Lee, and Y.-K. Sun, J. Power Sources 134, 88 (2004). 3- X. Wang, L. Gao, L. Li, H. Zheng, Z. Zhang, W. Yu, and Y. Qian, Nanotechnology 16, 2677 (2005). N. G. Jovic, A. S. Masadeh, A. S. Kremenovic, B. V. Antic, J. L. Blanusa, N. D. Cvjeticanin, G. F. Goya, M. V. Antisari, and E. S. Bozin, J. Phys. Chem. C 113, 20559 (2009).

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Talk 27 Nanostructured Materials & Dielectric Investigations G. Turkya+, M. Moussaa, A. Darwisha aMicrowave Physics and Dielectrics Department, National Research Centre (NRC), 33 El Bohouth St. (former El Tahrir St.), Dokki, P.O. 12622, Giza, Egypt.

+ Author for correspondence: [email protected]

Nanostructured materials are those materials have structural elements of dimension less than 100 nm. The revolution of nanotechnology arises recently from the explosively variation in all physical properties in accordance with the bulky materials. There are two scenarios of nanostructure design. The 1st one is synthesis of the considered sample at the atomic and molecular scales through chemical interactions. Secondly the nanoscale design nanoscale could take the up/down or down/up scenarios (nanoparticles, nanorods, nanofibers, nanotubes. Secondly, the design of the sample itself is at nano-scale in one of its dimension e.g. its thickness in the parallel configuration (thin films). The control of different parameters of the formed structure such as size, morphology, and distribution is corner stone of its properties and hence the field of application. Broadband Dielectric spectroscopy, BDS, covers nowadays the extraordinary spectral range from micro-hertz up to tera-hertz. This enables us to achieve sound contributions to contemporary problems in modern physics. Once again we have to reconsider the design of the sample @ micro and @ nano scale for dielectric measurements and how it could be completely different. We take the accumulation of charge carriers at interface between conductive hydrogel as electrolyte and electrode as an example. Keywords: Dielectrics, dynamic relaxation, electrode polarization, conductive hydrogel 1- Naglaa Salem El-Sayed, Mohammed. A. Moussa, G. Turky, Samir Kamel, Synthetic Metals 250 (2019) 104- 114 2- Nagla Salem Aboud, M.E. Abd El-Aziz, S. Kamel, G. Turky, Synthetic Metals 236 (2018) 44-53

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The Fifth International Symposium on Dielectric Materials and Applications ISyDMA’5 Virtual Edition; , Morocco, 15-17 April 2020

Talk 28 Using the impedance spectroscopy for investigation of aging, thermal and adsorption properties of glassy chalcogenide films D. Tsiulyanu,+ M. Ciobanu Department of Physics, Technical University, bul. Dacia 41, MD-2060 Chisinau, Moldova, + Author for correspondence: [email protected]

The work is dedicated to application of the method of impedance spectroscopy [1] to provide evidence and investigation of effects of aging, annealing, temperature and gas adsorption in chalcogenide based thin films. Briefly are described the peculiarities and unique properties of these materials, which determine their wide application in micro and optoelectronics, as well as the difficulties of their studying using traditional methods caused by samples structural disordering. The experiments have been provided with thin films of glassy quaternary composition As2Te13Ge8S3, synthesized in vacuum by melt-quenching method. The morphology and phase – structural state of the films was controlled by SEM and XRD methods, but impedance spectra were obtained using a HP4192A impedance analyzer. The measurements have been carried out in a large frequency range at different temperatures and environmental conditions, including

either dry or wet air, as well as their mixtures with NO2 or CO2. It was found a high influence of aging on impeadance spectra of Pt - As2Te13Ge8S3 – Pt funcțional structures , which make evidence for presence of large spatial and compositional disordering [2]. This influence can be stabilized by sample‘s post preparation annealing. Effect of temperature on impedance spectra of previously aged (or annealed) chalcogenide films consists in variation of the both real and imaginary part of impedance, due to variation of frequency dependent both resistance and capacitance of the thin film devices. Moreover, all these electrical parameters appears to be very sensitive at adsorptive processes. The spectra plotted as the imaginary part versus real part of impedance (Nyquist diagrams), represents depressed semicircles with radius's that depend on nature and concentration of adsorpted species. Adsorbtion of nitrogen dioxade results in an esential and frequency dependent decreasing of ipedance parameters , which it is explaned by efective chemisorption processes due to interaction of "odd" electrons of NO2 molecules with lone – pair electrons of chalcogen atoms. The effect of water vapor a contrary leads to a moderate increasing of impedance parameters that is explained by physisorption of H2O dipoles with negative poles inward, resulting in localization of free holes at the surface[3]. The simple physical adsorption

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explains also the effect of carbon dioxide on impedance spectra. This effect is unessential, but it is reversible and clear observed even at room temperature. Keywords: Chalcogenide films, Impedance, Aging , Annealing, Adsorption

1- J.R. Macdonald, Impedance spectroscopy, Wiley, New York, 1987. 2- D. Tsiulyanu, S. Marian, H-D. Liess, I. Eisele, Sensors and Actuators, B 100, 380 (2004). 3- D. Tsiulyanu, I. Stratan, A. Tsiulyanu, H-D. Liess, I. Eisele, Sensors and Actuators, B 121, 406 (2007).

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Talk 29 Glasses and glass-ceramics for electro-optic applications GRACA M. Pedro Fernandes Physics Department, Aveiro Portugal + Author for correspondence:[email protected];

Glass materials are immensely versatile and used every day in numerous applications. For example, fast proton-conductive glasses, have attracted great interest due to their immense potential as alternative membranes in fuel cells, gas sensors, and water electrolysis. Protons are highly mobile

when they are strongly hydrogen bonded in glasses, and their conductivity is primarily determined by the degree of hydrogen bonding and the concentration of mobile protons in the glass structure. Another research hot-topic which receives great attention is the development of dielectric glass-ceramics having simultaneously, high permittivity and breakdown strength, for high-voltage and pulsed power applications. The formation of such materials, for example by controlled heat treatment of the base glass, presents itself to the technological level with the great advantage, in relation to monocrystals and sintered ceramics, of the possibility of their properties (optical, electrical, mechanical, chemical, etc.). For example, the preparation of the well know LiNbO3 single crystals, by traditional growth techniques, is technically difficult and economically costly and with dense ceramics, it is difficult to achieve a congruent composition and therefore a huge scientific research on the fabrication methods of inorganic glasses containing LiNbO3 crystallites is an important current topic. In this presentation, a brief definition of glass, glass-ceramics, and their preparation processes and properties analysis will be the main focus. The presentation of case studies, as examples of such research, based on work performed in the Physics Department of Aveiro University will be done.

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Talk 30 New glassy hybrid materials for electrochemical green energy storage Marisa Alejandra Frechero+ Departamento de Química, INQUISUR-CONICET- Universidad Nacional del Sur (UNS),

Bahía Blanca, Argentina

+ Author for correspondence: [email protected] The 21st Century is marked by the paramount importance of new sources of green Energy develop. At present, an efficient energy use and renewable and clean sources for a sustainable growth is needed. This is why, finding diverse energy storage methods is the aim of much of our research interest today and also, for many Governments around the world. Batteries and supercapacitors are two common ways to storage electrochemical energy. Lithium ion batteries (LIBs) are today the most important and widely used rechargeable batteries, having the following advantages: high voltage, low self-discharge, long cycling life, low toxicity, and high reliability. The performance of these devices depends on the materials used both for their electrodes and electrolytes. Unfortunately, a very precise materials selection is not enough to guarantee good functionality; one of the biggest technology challenges is to find couples of materials -electrode/electrolyte-with high compatibility. In this presentation, it is reviewed some of our most recent results for electrolytes: glassy material and glassy hybrid materials (IL-glass) where, in all of them, the main ionic carrier is the Lithium cation. Our main goal has been to improve not only the electrolyte ionic conductivity but also to find the proper electrode materials that fits -as good as it can- at the interface, one of the most important issues to overcome, in order to obtain the new generation of all-solid state batteries.

Universidad Nacional del Sur

Bahía Blanca – Buenos Aires

Argentina

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Talk 31 Spectroscopic investigation of a-Si:H p-i-n solar Cells Abdelkader Outzourhit+ LN2E, Department of Physics Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech Morocco + Author for correspondence: [email protected] a-Si:H PIN solar cells were fabricated by successively depositing a 12nm 2 p-type a-SiC:H, on a 20x20 cm SnO2:F covered glass substrates followed by a 260 nm intrinsic (i) hydrogenated amorphous silicon (a-Si:H) layer, and finally a 20nm n-doped a-Si:H film. The cell was completed by an Al back contact. The Si-based films were deposited by plasma enhanced chemical vapor deposition (PECVD) at a plasma excitation frequency 13.56 MHz. Solar cells with a 1x1 cm2 active surface area were delimited by shadow masks on a 20x20 cm2 substrates. The configuration of the superstrate type cell is Glass/SnO2:F/p-type SiC:H/intrinsic -a-Si:H/n-type a-Si:H/Al. The highest efficiency obtained using this method is on the order of 8.8% with an open circuit 2 voltage Voc of 0.86 V, a short circuit current density Jsc of 15.6 mA/cm and a Fill factor FF of 62.6,%. The obtained efficiency is slightly lower than the record efficiency obtained in this family of cells (10.3%) because of the low short circuit current and resistive losses (series and shunt resistances). In order to shed further light on the devce the a-Si:H films were investigated by Raman Spectroscopy and spectroscopy ellipsometry. Raman spectra are dominated by a broad peak around 480 cm-1 that is characteristic of a-Si:H . The ellipsometric angles (Ψ and Δ) of the films were analyzed using the Tauc-Lorentz (TL) dispersion model. The obtained values of the model parameters are in good agreement with reported ones. Furthermore, the devices were investigated by capacitance voltage measurement and impedance spectroscopy. An increased in the capacitance of the device is observed only at low frequencies in the forward bias. In addition, the equivalent capacitance of the devices decreased with frequency and stabilized at a value close to the geometrical capacitance of the intrinsic layer at high frequency. This behavior is in agreement with the results obtained from the SCAPS-1D modeling the solar cell.

Acknowledgements

Special thanks are extend to IRESEN and the Green Energy Park of Benguerir where the cells were made by Kawtar Belrhiti Alaoui and Saida Laalioui

The author would also like the Centre d‘Analyse et de Caractérisation where the measurements were performed by Cheyma Naceur Abouloula..

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Part B POSTER PRESENTATIONS

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PP1 Electrochemical Impedance Spectroscopy study of Zinc electrodeposition A. El Fazazi,a,+ M. Ouakki,a M. Cherkaouia,b a Laboratory of Materials Engineering and Environment (LMEE), Faculty of Sciences, University Ibn Tofail, BP 133, 14 000 Kenitra, Morocco b ENSC, Ecole Nationale Supérieure de Chimie, Ibn Tofail University, B.P 133, Kenitra, Morocco + Author for correspondence: [email protected] Electrochemical Impedance Spectroscopy (EIS) is a useful technique for ranking coatings, assessing interfacial reactions, quantifying coating breakdown, and predicting the lifetime of coating/metal systems [1]. The response of reversible electrochemical systems studied in the presence of an ohmic drop, associated to the experimental setup, unfortunately resembled the response of kinetically slow systems. The best way of differentiating the kinetics of an electrode reaction from experimental side effects is to use an excitation function covering a large time domain. Thus, EIS was used to evaluate the barrier properties of the electrical double layer capacitance and to determine the polarization resistance [2]. In the evaluation of impedance data, the electrochemical interphase often is described by an equivalent circuit relevant for the conditions of the experiment, using circuit elements that represent the various physical processes present [3]. In this study, EIS is used to study the corrosion resistance of an electrodeposited Zn coating using different current densities and different pH values for electrodeposition. Keywords: EIS, Zn coating, current density, pH, corrosion 1- Eliaz N, Venkatakrishna K, Hegde AC, Surface and Coatings Technology, 205 (2010). 2- Yogesha S, Bhat KU, Hegde AC, Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry, 41 (2011). 3- S.R. Taylor and E. Gileadin Corrosion science, 51 (1995).

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PP2 Influence of RF-power on the optical, structural, and morphological properties of ZnS: Cr thin films C.M. Samba Valla,b , M. Chaika,+, H. El Aakiba, S.K. Hnawia, A.Agdada, A.Mellaloua A.Tchenkaa, M. Aggoura, A. Outzourhita 1Laboratory of Nanomaterials for Energies and Environments, Faculty of Sciences Semlalia, Cadi Ayyad University, Marrakech 40000, Morocco 2Laboratory of Renewable Energy and Environment, faculty of Science Kenitra, Ibn Tofail University PO Box 133, Kenitra. Morocco + Author for correspondence: [email protected];

Thin films of undoped zinc sulphide (ZnS) and chromium-doped zinc sulphide (ZnS:Cr) were deposited on glass and Si substrates by radio frequency (RF) sputtering. The time of deposition was set at 90 min, although the RF power varied in the range of 100 to 200 W. The morphological, optical, and structural properties of the grown thin films were investigated. Scanning electron microscopy observations revealed smooth films surfaces. Energy Dispersive Spectroscopy (EDS) revealed that the chromium sputtering rate is smaller than the Zn and S sputtering rates. The optical properties were examined by optical transmission measurements in the ultraviolet-visible-near-Infrared wavelength range. The specter of X-ray diffraction analysis indicated that all pulverized ZnS films were single-phase with a preferred growth orientation along the (111) plane of the zinc blende (ZB) phase. The Cr-doped films, on the other hand, showed the (111), (2 2 0), and (311) peaks of the same phase .The undoped ZnS films showed a crystallite size of 25.45nm for a RF power of 200 W. While in the case of ZnS:Cr, the crystallite size increased from 16.6 nm to 28.5 nm. The strain was shown to decrease from 2.2×10-3 to1.45×10-3. UV-Visible transmission measurements revealed that the ZnS films exhibit an average transmittance on the order of 70 % whilst that of the ZnS:Cr was less than 60 % in the visible wavelength region. The absorption of the doped films was found to increase with the deposition power. Moreover, the optical bandgap of the ZnS films was found equal to 3.57 eV, this value slightly decreases for ZnS:Cr. The films thickness increases with the increase of the deposition RF-power. Keywords: ZnS:Cr; Intermediate bandgap; Chromium doped zinc sulfur; Thin Films; Radio Frequency Sputtering

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PP3 Synthesis, characterization and study of the dielectric properties of BZT ceramics: (Ba1-yLn2y/3)ZrxTi1-xO3 A. Bendahhoua, M. Abou-Salamab, P. Marchetc, K. Chourtid, M. Loutoue,f , S. El barkanye a,b,dLaboratory of Physical Chemistry of Natural Resources and Environment, Faculty of Sciences Oujda. cUniversity of Limoges, IRCER, UMR 7315, Limoges F-87068, France e,fDepartment of Chemistry, Faculty Multidisciplinary Nador, University Mohammed Premier Oujda

+ Author for correspondence: [email protected] BaZrxTi1-xO3 (BZT) ceramics are interesting materials to use in the electronic field as capacitors. They have a high dielectric constant, a composition-dependent Curie temperature and better stability than Ba1-xSrxTiO3 in the paraelectric state [1-2].

The ceramics (Ba1-yln2y/3)ZrxTi1-xO3weresynthesizedonly by the solid state reaction method (with y = 0 and 0.1 x = 0.10, 0.25, 0.50, 0.75, 0.90 and Ln = La, Gd, Sm), Infrared spectroscopy analysis of the samples prepared reveals considerable stress on the metal- oxygen bond MO (M = Ti, Zr).

X-ray diffraction data were refined using the Rietveld method using Jana2006 software. Studies of density and porosity as a function of sintering temperature were taken into consideration in determining the appropriate sintering temperature. Scanning electron microscopy on sintered pellets revealed heterogeneous crystal growth. Impedance measurements have shown that the ferroelectric to paraelectric phase transition temperature is shifted to lower temperature values when the BZT ceramics have been doped with the rare earths. The study showed that the solid solution (Ba1-yLn2y/3)ZrxTi1-xO3 has a diffuse phase transition with a relaxing type ferroelectric behavior. In addition, the dielectric constant has been improved over the undoped BZT system. 1- Z. Yu, C. Ang, R. Guo, A.S. Bhalla, Mater. Lett. 61 (2007) 326. 2- J.W. Zhai, X. Yao, L.Y. Zhang, B. Shen, J. Appl. Phys. Lett. 84 (2006) 3136.

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PP4 Relationships between crystalline structure and dielectric properties in Sr2NdxSm(1-x)Ti2Nb3O15 ceramics K.CHOURTIa+, M. ABOU-SALAMAa, P. MARCHETb, Y. EL HAFIANEb, A. BENDAAHOUa and M. KARROUAa. a Multidisciplinary Faculty of Nador, Department of Chemistry, Mohammed First University, 60700 Nador-Morocco. b IRCER UMR7315, CNRS University of Limoges, European Ceramics Centre, 12 rue Atlantis, 87068 Limoges Cedex, France.

+ Author for correspondence: [email protected]

Because of their interesting dielectric properties and for some of them ferroelectric/piezoelectric properties, the tetragonal tungsten bronze materials (TTB) are used for varied applications in the field of microelectronic and microelectromechanical devices, such as capacitors or actuators and they attracted an increasing scientific interest.

The general formula of TTB is (A1)2(A2)4(C)4(B1)2(B2)8O30 [1,2]. In this formula, the (A1) and (A2) sites are occupied by large monovalent ions (Na+, K+…), divalent ions (Sr2+, Ba2+…) or trivalent ions (Sm3+, Bi3+…). The triangular channels (C) can only contain relatively small ions such as Li+ and are often empty. The (B1) and (B2) octahedral sites contains small and highly charged ions such as Nb4+or Ti4+ [3,4]. In this study, tungsten-

bronze type materials of Sr2Sm(1-x)NdxTi2Nb3O15 composition (x=0; 0,25; 0,5; 0,75 and 1) were elaborated by classical solid-state reaction. The structural characterization demonstrate that these compounds present tetragonal symmetry, using two space groups P4bm (N°100) and P4/mbm (N°127) respectively. The lattice parameters are a=b≈12,2Ǻ; 3 3 c≈3,8Ǻ; V≈579,0Ǻ and Z=2. ρcalc≈5,3g/cm . In this compounds, Ti and Nb cations show

obvious off-center displacements along the c axis in both the Ti/Nb(1)O6 and the

Ti/Nb(2)O6 octahedra. Besides, the unequal Ti/Nb(2)–O bonds length in the equatorial

plane of Ti/Nb(2)O6 octahedra indicates the displacement of the Ti/Nb(2) cations in the (ab) plane, and no displacement of the Ti/Nb(1) cations exists in the ab plane. The measurements of permittivity and dielectric losses of the ceramic samples performed

between 25°C and 700°C (100Hz to 1MHz) high dielectric constants (εr=127~194), and low dielectric losses (tan(δ) around 10-4 at 1MHz). The maximum value of the dielectric

constant is obtained for x=0 (εr=194). The Curie temperature Tc decreases from 332 to 246°C as a function of the substitution of the samarium by neodymium. Detailed microstructural analysis by scanning electron microscope (SEM) and (EDS) for this compounds are investigated.

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Keywords: ISyDMA’2019, Symposium, Dielectric Materials and Applications

1- Simon, A. and J. Ravez, Solid-state chemistry and non-linear properties of tetragonal tungsten bronzes materials. Comptes Rendus Chimie, 2006. 9(10): p. 1268-1276. 2- Arnold, D.C. and F.D. Morrison, B-cation effects in relaxor and ferroelectric tetragonal tungsten bronzes. Journal of Materials Chemistry, 2009. 19(36): p. 6485-6488. 3- Ravez, J. and M. Dabadie, Influence de la substitution du fluor à l'oxygène sur les propriétés ferroélectriques de composés de structure" bronzes oxygénés de tungstène quadratiques". 1973. 4- S. Lanfredi, D.H. Gênova, I.A. Brito, A.R. Lima, M.A. Nobre, Structural characterization and Curie temperature determination of a sodium strontium niobate ferroelectric nanostructured powder, Journal of Solid State Chemistry, 184 (2011) 990-1000.

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PP5 Imidazole derivatives corrosion inhibition of mild steel in 1m HCl: electrochemical, thermodynamical and theoretical calculation Z. Aribou,a,+ M. Ouakki,b N. Khammou, a M. Galai, a I. Chaouki ,c M. Ebn Touhami, a a Laboratoire d'Ingénierie des Matériaux et d'Environnement: Modélisation et Application, Université Ibn Tofaïl, Kénitra. b Laboratory of materials, electrochemistry and environment, Faculty of Science, Ibn Tofail University, PB. 133-14050 Kenitra, Morocco. c Centre Universitaire d’Analyses, d’Expertise, de Transfert de Technologies et d’Incubateur (CUAETTI), Université Ibn Tofaïl, Kénitra. + Author for correspondence: [email protected]

Mild steel is a common material and has found widespread use in many industries. However, its ability to corrode in aggressive environments limits its application. This study aims to study mild steel inhibition in 1M HCl using two organic compounds, based on imidazole derivatives. Measurements of weight loss and electrochemical techniques, such as polarization plots and Electrochemical Impedance Spectroscopy (EIS) were used to study their behavior. Polarization plots revealed that these inhibitors are mixed type with anodic predominance. Thermodynamic parameters were calculated and analyzed. Surface morphology of the mild steel was characterized by Scanning Electron Microscopy (SEM) coupled with EDX. Besides, theoretical calculations based on DFT method of level B3LYP / 6-31G (d, p) were realized using Gaussien 09 software which led to a good agreement between experimental and theoretical results. Keywords: Applications Imidazole, inhibition, corrosion, acier ordinaire, HCl, EIS. DFT. 1- M. Ouakki, M. Galai, M. Rbaa, A.S. Abousalem, B. Lakhrissi , E.H. Rifi, M. Cherkaoui., 2019. Quantum chemical and experimental evaluation of the inhibitory action of two imidazole derivatives on mild steel corrosion in sulphuric acid medium. Heliyon, 5, e02759, (2019). 2- K. Alaoui, R.Touir, M.Galai, H.Serrar, M. Ouakki, S. Kaya, B.Tüzün, S.Boukhris, M. Ebn Touhami, Y. El Kacimi. Electrochemical and computational studies of some triazepine carboxylate compounds as acid corrosion inhibitors for mild steel. J. Bio- and Tribo-Corros. 4, 37. (2018).

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PP6

Effect of incorporating two gate insulators (SiO2 and Al2O3) on the performance of the a-IGZO-based TFT transistor M. Tamoum,a,+ H. Mazari,a N. Benseddik,a K. Ameur,a A. Boumesjed,a Z. Benamara, a N. Benyahyaa a Laboratoire de Microélectronique Appliquée, Faculté de Génie Electrique, Université de Sidi Bel Abbes, BP89, 22000 Sidi Bel Abbes, Algérie + Author for correspondence: [email protected]

Metal oxides talc indium gallium oxide Amorphous zinc (a-IGZO) is a new promising for the development of thin film transistor because of their high electronic mobility, their low threshold voltage (Vth ), high surface stability and low temperature manufacturing process.

In this study, we studied the effect of near-valence band (Ev) faults on the output parameters of the a-IGZO TFT using the TCAD. It has been found that the donor type defects near the valence band have no effect, but the acceptor type defect states near the valence band are the reason for the positive Vth shift. The values of the output parameters: mobility (µeff), the threshold voltage (Vth), the Ion / Ioff ratio and subthreshold swing (SS) are given respectively: 13.8 cm2 / Vs, 2.38 V, 5.24x1012 and 0.15 V/dec. The performance a-IGZO TFT is affected by the deterioration of mobility. It is therefore concluded that defects close to the valence band are not donor defects but acceptor defects with a Gaussian distribution which can also degrade mobility.

We can improve the output values of a-IGZO TFT by stacked insulator gate structure of SiO2 and Al2O3. Based on this mechanism, an optimized stacked GI structure that exhibited a low subthreshold swing and high μeff was found and used to achieve low-voltage operation in a

TFT device. The new values of the output parameters: µeff, Vth, the Ion / Ioff and SS are given respectively: 14.9 cm2/ Vs, -0.01 V, 2.69x1013 and 0.11 V/dec.

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PP7 Effect of microcrystalline cellulose on dielectric properties of latex hybrid composites S. Larguech,a,+L. kreit,bA. Zyane,cA. Triki,a M.El Hasnaoui,b M.E. Achour,b A. Belfkirac aLaMaCoP, Faculty of Sciences of Sfax, University of Sfax, BP 3018 Sfax, Tunisia bLASTID, Faculty of Sciences, University of Ibn-Tofail, BP 133 - 14000 Kénitra, Morocco c LCBM, University of Cadi Ayyad, Faculty of Sciences and technologies, Av. Abdelkarim Elkhattabi, Marrakech B.P 549, Morocco + Author for correspondence: [email protected]

Dielectric measurements were performed on EVA/VeoVa matrix and its hybrid composites reinforced with microcrystalline cellulose (MCC) and multiwalled carbon nanotubes (MWCNT) in the relative weight fraction 9:1. In this dielectric study, the following hybrid compositesweight fractions were undertaken : 0.5%, 1%, 2% and 4%. Dielectric spectra were carried out in the frequency range from 10-1 Hz to 10 MHz and the temperature range from- 35°C to 140°C. The dielectric analysis at low temperatures of these hybrid composites revealed the effect of

MCC on the secondary relaxations namely wet1, wet2 and cell relaxations. Their appearance was mainly originated from the influence of adsorbed water on the local structure and dynamics of cellulose molecules. As at normal environment condition, adsorbed water in cellulose is mostly bound water, this latter could be further categorized as tightly-bound water and loosely-bound water. These latter gave rise to the wet1, wet2 relaxations, respectively. The former relaxation appearing at higher MCC weight fraction could be explained by a higher MCC hydrophilic character. The dielectric analysis at high temperatures of these hybrid composites has shown the presence of the interfacial polarization effect (MWS),  and  relaxations. Analyzing  and  relaxations according to Vogel-Fulcher-Tammann law and Havriliak-Negami model allowed probing the reinforcement/matrix interactions in accordance to weight fraction of the hybrid composites.

Keywords: EVA/VeoVa matrix, Microcrystalline Cellulose, Secondary relaxations, Bound water, Hybrid composites.

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PP8 Characterization and thermal conductivity of cellulose based cement composite S. Rbihi a, +, L. Laallam a, A. Jouaitia a Laboratory of Sustainable Development, Sultan Moulay Slimane University, Beni Mellal, Morocco

+ Author for correspondence: [email protected]

The main idea is the development of different combinations of cellulose insulating composite materials, derived from sawdust, while incorporating these organic fillers in cement blocks for potential use in the field of thermal insulation. The main objective of this study is the creation of a dielectric insulating material with developed thermal properties and low thermal conductivity λ while using the technique of the hot plate evolving in a non-stationary regime, an inexpensive method. In addition, the experimental work makes it possible to show important results, by decreasing the conductivity of the cement samples based on sawdust up to 0.2 W / m. ° C. A characterization system such as X-ray diffraction (XRD) and the optical microscope is used for the characterization of the samples.

Keywords: thermal conductivity, Dielectric insulating material, cellulose based cement composite

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PP9 Using different DFT implementations for studying structural, electronic and electrical properties of tetragonal BaTiO3 and PbTiO3 S. Amounas,a,+ H. Chaib,a K. Sbiaai,b A. Nafidic a Polydisciplinary Faculty of Ouarzazate, Ibn Zohr University, Morocco b Polydisciplinary Faculty of Khouribga, Sultan Moulay Slimane University, Morocco c Faculty of Sciences, Ibn Zohr University, Agadir, Morocco + Author for correspondence: [email protected]

Structural, electronic, and electrical properties of tetragonal barium titanate (BaTiO3) and lead titanate (PbTiO3) single crystals have been investigated using first principle calculations. We use density functional theory (DFT) and test the accuracy and efficiency of several DFT implementations (plane waves vs localized basis sets, all-electron vs pseudo potential calculations, etc.) as implemented in Quantum Espresso [1, 2]. The results we obtained, for both materials at room temperature, of equilibrium lattice constants, equilibrium unit cell volume, electronic band structure, density of states, gap energy and dielectric constants are in good agreement with previous experimental and theoretical findings. Furthermore, the spontaneous polarizations of both materials are calculated using the modern theory of polarization. Our calculated values of these polarizations agree well with the corresponding measured values. Keywords: Barium titanate, Lead titanate, Spontaneous polarization, Electronic band structure, Density of states, Gap energy and Dielectric constant 1- F. Cora, Molecular Physics 103 (18), 2483 (2005). 2- T. Mahmoodi, Acta Physica Polonica 127 (6), 1616 (2015). 3-

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PP10 Electrical study of a composite material based on an epoxy polymer containing cyclotriphosphazene O. Dagdaga,b,+, A. El Harfib, A. El Mansouric, A. Outzourhitd, A. El Bachirie, M. Ebn Touhamif, L. El Ganag, M. El Gouria aLaboratory of Industrial Technologies and Services (LITS), Department of Process Engineering, Height School of Technology, Sidi Mohammed Ben Abdallah University, P.O. Box 2427, 30000, Fez, Morocco. bLaboratory of Agroresources, Polymers and Process Engineering (LAPPE), Department of Chemistry, Faculty of Science, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco. cLPSCM, Department of physics, Faculty of Sciences Semlalia, Cadi Ayyad University, PB, 2390, Marrakech, Morocco. dNanomaterials for Energy and Environment Laboratory, Cadi Ayyad University, PB, 2390, Marrakech, Morocco. eUniversity Department, Royal Naval School, Sour Jdid Boulevard, Casablanca, Morocco. fLaboratory of Materials Engineering and Environment: Modeling and Application, Faculty of Science, Ibn Tofail University, Box 133-14000, Kenitra, Morocco gLaboratory of Optoelectronics, Physical Chemistry of Materials and Environment, Department of Physics, Faculty of Science, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco. + Author for correspondence: [email protected]

In this work, we have prepared, studied, formulated and characterized the electrical behavior of a composite material based on an epoxy resin Diglycidyl Ether of Bisphenol A (DGEBA) reinforced with hexaglycidyl cyclotriphosphazene (HGCP). The hardener used is 4,4'- methylene dianiline (MDA). DGEBA-HGCP-MDA epoxy composite materials with reinforced HGCP which varied from 5 to 10% by weight were prepared by mixing in the molten state. The cured composites have been characterized by various techniques which consist of SEM morphology. The electrical characterization, this is done with a frequency variation range from 0.1 Hz to 100 KHz at room temperature. These measurements revealed that the electrical behaviors strongly depend on the quantity of HGCP in the DGEBA matrix. The capacitance-frequency measurements suggest a distribution of the states located in the forbidden band of the mixtures. Materials as prepared appear to be promising applications in electronic compounds. Keywords: Epoxy resin, HGCP, Formulation, composite and electrical behavior.

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PP11 Coupled heat transfer by natural convection and surface radiation in an open cavity Z. Charqui, M. Boukendil+, L. El Moutaouakil, Z. Zrikem LMFE, Department of Physics, Cadi Ayyad University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh, Morocco + Author for correspondence: [email protected]

In recent decades, the heat transfer by natural convection in closed cavities has aroused great interest from scientific researchers [1-2]. This interest is dictated by the important role played by this mode of heat transfer in many industrial applications. Examples include: cooling of electronic components, air conditioning, heat exchangers, thermal power plants, storage tanks, nuclear reactors, insulation systems, etc. The transfer of heat by natural convection in open cavities, however, has not been studied as intensively although this type of cavity is very encountered in reality [3-4]. In this work, the finite volume method is combined with the discrete ordinate method to study numerically the natural convection coupled to surface radiation in an open cavity filled with air. Two heating modes are considered. In the first mode, the cavity is heated via the wall facing the opening, while in the second mode, the cavity is heated by its bottom corner (figure).The effect of Rayleigh number and surface radiation on the dynamic and thermal structure of the flow, as well as heat transfer is studied. The obtained results show that there is an effect of the studied parameters and that the cooling of the heated part is better in the case where the cavity is laterally heated. Keywords: Numerical simulation, Natural convection, Surface radiation, Open cavity

1- S. Bawazeer, A.A. Mohamad, P. Oclon, Natural convection in a differentially heated enclosure filled with low Prandtl number fluids with modified lattice Boltzmann method, International Journal of Heat and Mass Transfer, 143, 118562 (2019). 2- V. Kishora, S. Singha, A. Srivastavab, Investigation of convective heat transfer phenomena in differentially- heated vertical closed cavity: Whole field experiments and numerical simulations, Experimental Thermal and Fluid Science, 99, pp. 71–84 (2018). 3- K.M. Gangawane, R.P. Bharti, and S. Kumar, Lattice Boltzmann analysis of effect of heating location and Rayleigh number on natural convection in partially heated open ended cavity, Korean J. Chem. Eng., 32, 8, pp. 1498–1514 (2015). 4- O. Singh, S. Singh, S.B. Kedare, Effect of thermal radiation on accuracy of restricted domain approach in a square open cavity, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Phoenix, Arizona, USA, November 11–17 (2016).

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PP12

Numerical study of AgInTe2 solar cells using SCAPS B. Belkacemi,a N. Benseddik,a,b,+ F. Boukabrine,a K. Ameur,b H. Mazari,b A. Boumesdjed,b N. Benyahya, bZ. Benamara. a Department of Physics, Djillali Liabes University of Sidi Bel-Abbes, 22000. Sidi Bel-Abbes, Algeria. b Laboratory of Applied Microelectronics, Department of Electronics, Djillali Liabes University of Sidi Bel-Abbes, 22000. Sidi Bel-Abbes, Algeria + Author for correspondence: [email protected]

The semiconductors ternary (ABX2) show a much richer of chemical and physical properties [1]. The ternary (ABX2) semiconductors have wide optical band gaps range and motilities of carrier, has led to their appearance importance device materials, including solar cells of photovoltaic light-emitting diodes [2,3]. In accordance with this, AgInTe2 solar cells have proved to be the next big advancement in the field of solar energy. In this work, different numerical simulations were performed using SCAPS [4]. The doping density and layer thickness are investigated under solar illumination of AM1.5 for optimized performance of solar cell. Thus starting from I-V curves, we have calculated the short-circuit current Icc, the open-circuit voltage Voc, the fill factor and the efficiency conversion. This structure can also provide a fundamental solar cell unit for developing very high efficiency solar cell.

Keywords: AgInTe2, solar cell and SCAPS. 1- J.L. Shay, J.H. Wernick, Ternary Chalcopyrite Semiconductors Growth, Electronic Properties and Applications, Pergamon, Oxford, (1975)). 2- P. Migliorato, S. Wagner, J.L. Shay, H.M. Kasper, Appl. Phys. Lett. 25, 434 (1974). 3- L.L. Kazmerski, Nuovo Cimento D 2 2013 (1983) . 4- M. Burgelman, P.Nollet, S. Degrave Thin Solid Films 527 361-362 (2000).

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PP13 Crossover from VRH E-S to NNR VRH in 2D p-GaAs at B=0 S. Dlimia’+, A. El kaaouachia, b, B. Ait Hamoub, A. Echchelhc aPhysics department, University Ibn zohr, FSA, B. P 8106, Hay Dakhla, 80000 Agadir, Morocco bMPAC Group, Physics department, UIZ, FSA, B. P 8106, Hay Dakhla, 80000 Agadir, Morocco cLaboratory of Energetic Engineering and Materials, Faculty of Sciences ibn Tofail, Kenitra, Morocco + Author for correspondence: [email protected]

We investigate the hopping conductivity behavior as a temperature in the insulating phase at zero magnetic field and low temperature. Crossover from a Efros-Shkovskii variable range hopping (VRH) regime to activated regime have been observed in a GaAs two-dimensional hole system situated near the interface of a GaAs/AlGaAs heterostructure grown on a GaAs (311) substrate. This conductivity behavior in quantum wells p-GaAs is qualitatively consistent with the laws laid down by the theories of localized electrons with interaction. At sufficiently strong interaction, the holes in the localized states hop collectively.

Keywords: GaAs heterostructues, Electrical transport properties; Low temperature; Variable range hopping 1- B. I. Shklovskii et A. L. Efros, Electronic Properties of doped semiconductors (Springer-Verlag, (1984) 2- AR. Hamilton, M.Y.Simmons,M.Pepper,E.H.Linfield, D.A.Ritchie, PhysicaB 296 21-3 (2001) 3- S. Dlimi, A. El kaaouachi, A. Narjis, Physica E 54 181–184 (2013) 4- Y. Ono, J. F. Morizur, K. Nishiguchi, K. Takashina, H. Yamaguchi, K. Hiratsuka, S. Horiguchi, H. Inokawa and Y. Takahashi, Phys. Rev. B 74, 235317 (2006) 5- H. Liu, A. Pourret and P. Guyot-Sionnest ACS Nano, 4, 5211–5216 (2010) 6- T. Ferrus, R. George, C. H. W. Barnes, N. Lumpkin, D.J. Paul and M. Pepper, Phys. Rev. B 73, 4, 041304(R) (2006); ibid J. Phys.: Condens. Matter 19, 226216 (2007) 7- Y. Lee, C. Liu, Y. Yang, Randolph E Elmquist and C. Liang, Chinese Journal of Physics 55 1235–1241 (2017) 8-

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PP14 Contribution to the study of elementary magnetic excitations properties of the [Fe / Pt] super-lattices M. Karam a, A. Fahmi a, + and A. Qachaou a a Laboratoire de physique de la matière condensée, Ibn Tofailuniversity, kenitra, Morocco + Author for correspondence: [email protected]

The proposed work is a contribution to the study of elementary magnetic excitations properties of the [Fe / Pt] super-lattice. This is done within Heisenberg‘s model with localized spins. The corresponding Heisenberg Hamiltonian takes into account exchange, anisotropies and dipolar interactions. The Green‘s function technic is used to diagonalize this Hamiltonian. The excitation spectrum and spin magnetization are, then, calculated numerically. The adjustment of the obtained theoretical results with the experimental ones is more than satisfactory. It allowed us to obtain an estimates bulk and surface exchange integrals values for various magnetic layer thicknesses. Keywords: Heisenberg model, exchange interactions excitation spectra, magnetization

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PP15 Natural convection in a square cavity containing two heat-generating conducting body R. Hidki, L. El Moutaouakil, M. Boukendil+, Z. Zrikem, A. Abdelbaki LMFE, Department of Physics, Cadi Ayyad University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh, Morocco + Author for correspondence: [email protected]

The cavity with active or inactive square blocks can find applications in several engineering fields. Consequently, a good estimate of the heat transfer inside this type of configuration is important. Many researchers have focused on this problem [1-4]; either from the point of view of the numerical accuracy of the calculation, or from the point of view to improve the thermal behaviour. The bibliographic review showed that the case of two heat-generating conducting body, in an enclosure cooled by one of these sides, was not dealt with. In this paper, the heat transfer by natural convection in a two-dimensional square cavity containing two heat-generating conducting body (figure) was studied numerically. Two configurations are considered. In the first, the two blocks are placed on the horizontal median of the cavity, while in the second, the blocks are placed on the vertical median. Finite volume procedure based on the SIMPLE algorithm has been used to solve the governing equations. The air motion in the configuration is laminar. The straight wall is cooled uniformly with a constant temperature TC, while the rest of the walls are kept adiabatic. The two blocks generate two uniform volumetric heat generation Q1 and Q2. The effects of parameters, namely, the two Rayleigh numbers, the ratio of the conductivities and the position of the two blocks influencing the flow and heat transfer in the cavity are discussed. Keywords: Numerical simulation, Natural convection, Heat-generating conducting body, Closed cavity

1- J. M. House, C. Beckermann, T. F. Smith, Effect of a centered conducting body on natural convection heat transfer in an enclosure, Numerical Heat Transfer, Part A, 18, 213–225 (1990). 2- S. M. Dash, T. S. Lee, Natural convection in a square enclosure with a square heat source at different horizontal and diagonal eccentricities, Numerical Heat Transfer, Part A, 68, 686–710 (2015). 3- M. Sheikholeslami, K. Vajravelu, Lattice Boltzmann method for nanofluid flow in a porous cavity with heat sources and magnetic field, Chinese J. Phys., 56, 1578–1587 (2018). 4- F. Garoosi, L. Jahanshaloo, M. M. Rashidi, A. Badakhsh, M. E. Ali, Numerical simulation of natural convection of the nanofluid in heat exchangers using a Buongiorno model, Appl. Math. Comput., 254, 183–203 (2015).

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PP16 Numerical simulation of natural convection in partially open cavity with vertical conductive obstacle K. Azagar, L. El Moutaouakil, M. Boukendil+, A. Abdelbaki, Z. Zrikem LMFE, Department of Physics, Cadi Ayyad University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh, Morocco + Author for correspondence: [email protected]

Heat transfer by natural convection in closed cavities has been extensively studied [1-2]. This method of heat transfer has a wide range of applications in engineering: cooling of electronic components, air conditioning, etc. However, the heat transfer in open cavities, has not been studied as intensively although this type of cavity is very encountered in reality [3]. Present study has offered numerical investigation for heat transfer coupled by conduction and natural convection and fluid flow in a partially open cavity containing a vertical conductive obstacle body. The cavity is partially opening in the right vertical wall. The left vertical boundary was isothermal. All the other boundaries are assumed to be adiabatic. The results of this study were obtained for various governing parameters such as the Rayleigh number, varying from103 to 106, the conductivity ratio, the opening and the obstacle positions. The control volume method was adopted for solving the conservation equations, in two dimensional forms, using the SIMPLE algorithm (Semi Implicit Method for Pressure Linked Equation) developed by Patankar [4]. The results are presented in terms of streamlines, isotherms, velocity profiles, the Nusselt number and the volume flow rate of air through the opening. It is noticed that the results are strongly influenced by the selected parameters. Keywords: Partially open cavity, Natural convection, Conduction, Conductive obstacle, electronic components 1- S. Bawazeer, A.A. Mohamad, P. Oclon, Natural convection in a differentially heated enclosure filled with low Prandtl number fluids with modified lattice Boltzmann method, International Journal of Heat and Mass Transfer, 143, 118562 (2019). 2- V. Kishora, S. Singha, A. Srivastavab, Investigation of convective heat transfer phenomena in differentially- heated vertical closed cavity: Whole field experiments and numerical simulations, Experimental Thermal and Fluid Science, 99, pp. 71–84 (2018). 3- O. Singh, S. Singh, S.B. Kedare, Effect of thermal radiation on accuracy of restricted domain approach in a square open cavity, Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Phoenix, Arizona, USA, November 11–17 (2016). 4- S.V. Patankar, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Corp (1980).

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PP17 Thermal and electrical characterization of Poly (butylene succinate) (PBS) / Polypropylene (PP) with different blend ratio S. Taktak,a,+ H. Hammami,a S. Fakhfakh,a A. Kallel,a O. Jbara,b a LaMaCoP, Faculty of Sciences of Sfax, University of Sfax, BP 3018 Sfax, Tunisia b LISM, Université de Reims Champagne-Ardenne, Reims 51100, France + Author for correspondence: [email protected]

The main goal of this work is the investigation of the dielectric properties of the immiscible polypropylene/poly(butylene succinate) (PP/PBS) blends. The mixtures were successfully prepared using an internal mixer with different weight ratios of (PP/PBS); (100/0), (80/20), (70/30), (50/50), (20/80) and (0/100). Dielectric spectroscopy of the investigated blends, over a large temperature domain varying between 20 °C and 100 °C and a frequency range from 0.1 Hz to 1 MHz, was considered to probe the molecular mobility and interfacial transitions of the materials. Furthermore, the electrical properties (charge trapping, transport and secondary electron emission) were highlighted by submitting the specimens to an electron irradiation of Scanning Electron Microscope (SEM). Thermal study, using Differential Scanning Calorimetry (DSC), was also performed to further evidence the immiscibility of (PP/PBS) blends. The dielectric permittivity spectra displayed the different intrinsic material relaxations and were perfectly adjusted by the general Havriliak-Negami that permits to well discuss the obtained phenomena. The amount of trapped charge in the (PP/PBS) blends at the steady state was determined revealing its increase with increasing PBS content. Keywords: Dielectric spectroscopy, Scanning Electron Microscope, Electrical properties, Electron irradiation, Trapped charge, Immiscible blend.

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PP18 Influence of heat sources/sinks on unsteady natural convection in a differentially heated enclosure temperature L. El Moutaouakil a, M. Boukendila,+, Z. Charqui a, Z. Zrikema a LMFE, Department of Physics, Cadi Ayyad University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh, Morocco + Author for correspondence: [email protected]

Natural convection heat transfer in an annulus system was simulated numerically by Lattice Boltzmann Method. The system consists of a differentially heated square cavity filled with water containing isothermal pairs (heat sources/heat sinks) having a circular shape (figure). The analysis is done for different Rayleigh numbers ranged from 103 to 106 and different arrangement of the cylinders inside the cavity to investigate the effects of these parameters on heat transfer characteristics. The developed code is validated using some thermal natural flows examples: natural convection in a differentially heated cavity, natural convection inside a square cavity with a heated circular or elliptic cylinder, natural convection in a concentric annulus, natural convection in a triangular cavity containing a heated circular cylinder [1-3]. For the four differents studied arrangement of the circular cylinders (configurations , , and ), the effect of the Rayleigh number on the local and average convective Nusselt numbers are discussed. The obtained results show that the arrangement of the cylinders inside the cavity considerably affects the heat transfer in the cavity.

Keywords: Numerical simulation, Unsteady natural convection, Annular space, Heat transfer

1- H. Ding, C. Shu, K.S. He, Z.J. Lu, Simulation of natural convection in eccentric annuli between a square outer cylinder and a circular inner cylinder using local MQ-DQ method, Numerical Heat Transfer, Part A, vol. 47, pp. 291-313 (2005). 2- C. Shu, H. Xu, Y.D. Zhu, Numerical study of natural convection in an eccentric annulus between a square outer cylinder and a circular inner cylinder using DQ method, International Journal of Heat and Mass transfer, vol. 44, pp. 3321-3333 (2001). 3- F. Moukhalled, S. Acharya, Natural convection in annulus between concentric horizontal circular and square cylinders, Journal of Thermophysics and Heat Transfer, vol. 10, pp. 524-531 (1996).

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PP19 Carriers mobility determination in PS/PANI films by the potential decay technique D. Mezdour,a M. Tabellout,b a Laboratoire d'études des matériaux, Université Mohamed seddik Benyahia, Ouled Aissa, Jijel 18000, Algeria b Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, Le Mans Université, Avenue Olivier Messiaen 72085, Le Mans cedex 9, France + Author for correspondence: [email protected]

Organic electronics has emerged as a new frontier area for flexible printable electronics. Several thermoplastic polymers such as polystyrene (PS) [1], polyvinyl chloride (PVC) [2], polyamides (PA) [3], polyvinyl alcohol (PVA) [4] were combined with Polyaniline salt to obtain conductive blends with desirable physical properties. Polyaniline (PANI) is an air- stable conducting polymer. Here, an "inert" polymer–polystyrene, was chosen as the matrix polymer to form blends with. This study reports on the electrical properties of Polystyrene/Polyaniline thin layers investigated by the potential decay technique. Films were first corona charged. Surface potential decay was then recorded versus time using a probe connected to an electrostatic voltmeter. As expected the surface conductivity was enhanced by incorporating only 1 wt. % of polyaniline. This behavior corresponds to an increased conductivity of films according to the establishment of conductive paths in the PS matrix due to the percolation of the PANI clusters scattered in the PS. Using a model proposed by Perlman et al.[5], a mobility of about 2.2x10-9  cm2/V.s was obtained. This value is higher than the one reported for polyethylene (10-11 cm2/V.s) [6] and is consistent with the calculated surface conductivity. These results are suitable for antistatic and semiconductive applications.

Keywords: Composite, Polymer, Potential decay, Mobility

1- V. Jousseaume, M. Morsli, A. Bonnet, S. Lefrant, J. Appl. Polym. Sci. 67, 1209 (1998). 2- P. Banerjee, B.M. Mandal, Macromolecules 28, 3940 (1995). 3- D. Mezdour, M. Tabellout, S. Sahli, J.-F. Bardeau, AIP Conf. Proceedings 1569, 319 (2013). 4- P.S. Rao, S. Subrahmanya, D.N. Sathyanarayana, J. Appl. Polym. Sci. 98, 583 (2005). 5- M.M. Perlman, T.J. Sonnonstine, J.A. St.Pierre, J. Appl. Phys. 47, 5016 (1976). 6- A.T. Hoang, L. Pallon, D. Liu, Y.V. Serdyuk, S.M. Gubanski, U.W. Gedde, Polymers 8; 87 (2016).

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PP20 The temperature effect on the physical properties of PbS nanocrystalline developed by the chemical bath deposition method (CBD) A.El madani a, +, M.Lharcha ,M.Fahoumea , A.Qachaoua , A.Raidoua aIbn Tofail University, Faculty of Sciences, Department of Physics, Condensed Matter Physics Laboratory, Kenitra, Morocco + Author for correspondence: AZIZ.EL [email protected]

Thin films of nanocrystallines lead sulfide PbS have been deposited on glass substrates at different deposition temperatures of 30, 40, 50 and 60 °C. The films were synthesized by chemical bath deposition (CBD) an aqueous solution contained lead acetate, thiourea, Tri- sodium citrate and sodium hydroxide. Tri-sodium citrate has been used as a reducing and stabilizing agent. X-Ray diffraction, UV-vis-NIR-Infared spectrophotometry and scanning electron microscopy were used to investigate the effect of deposition temperature on the characteristic properties of the PbS thin films. The one hand, X-Ray diffraction measurements have revealed that the increasing in deposition temperature caused the increasing in grains sizes, and these sizes were found to be between 39.46 to 45.35 nm. In the other hand, the optical band gap Eg decreased from 0.97 eV to 0.87 eV when the deposition temperature increased. This value of Eg can make the material useful in various optoelectronic applications. Keywords: PbS thin films, nanocrystalline lead sulfide, chemical bath deposition, scanning electron microscopy, optical proprieties.

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PP21 Design of experiments for modeling and optimization of nickel electrodeposition process N. Khemmoua,*, Z. Aribou a, I. Chaouki b, R.A. Belakhmima b, M. Ebn Touhamia a Laboratoire d'Ingénierie des Matériaux et d'Environnement: Modélisation et Application, Université Ibn Tofaïl, Kénitra. b Centre Universitaire d’Analyses, d’Expertise, de Transfert de Technologies et d’Incubateur (CUAETTI), Université Ibn Tofaïl, Kénitra. +Author for correspondence: [email protected]

Nickel deposition on brass is a technique widely used in various industrial activities. Nickel- plating using the watt bath is frequently used because of the appearance and stability of the deposit over time. However, deposition processes are relatively complex and depend on several factors such as pH, temperature and bath composition. In order to improve the quality of this electroplating on brass, the central composite experimental design and response surface methodology were used for the modeling and optimization of this process. The proposed deposition bath is a nickel bath mixed with an organic additive: but-2-yne-1,4-diol. Multivariate regression models developed with two controllable input variables, namely the influence of the organic additive concentration and the temperature of the treated bath; and the influence of bath temperature and pH were found to be statistically significant in predicting nickel electroplating responses, such as brightness, hardness and average thickness of the deposited layer. The main and interaction effects of the input variables on the process outputs were investigated by graphical representation of the response surfaces using 3D plots and 2D contour maps. The models were statistically validated by an analysis of variance (ANOVA) which revealed acceptable coefficients of determination. Modelling and optimization of the experiments was carried out by the JMP® software. Keywords: Experimental design, Response Surface Methodology, Brass, Nickel-plating

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PP22 CaSi2: a promising material for the synthesis of novel functionalized two- dimensional crystalline silicon nanosheets A. Nayad a,+, A. Hasnaoui b, S. K. Hnawi a,b, L. Fkhar a,c, Y. Hadouch d, D. Mezzane d, L. El firdoussi a, M. Ait Ali a a Laboratoire de Chimie de Coordination et Catalyse, Université Cadi Ayyad, BP 2390, 40001, Marrakech, Morocco. b Laboratory of Nanomaterials, Energy and Environment (LNEE), Cadi Ayyad University, BP 2390, 40001, Marrakech, Morocco. c Materials and Nanomaterials Center, MAScIR Foundation, Rabat, Morocco. d Laboratoire de la Matière condensée et Nanostructures, Université Cadi Ayyad, BP 2390, 40001, Marrakech, Morocco. + Author for correspondence: [email protected]

Among the variety of 2D materials, Silicene Nanosheets (SiNSs) having nanometers thicknesses and lateral dimensions ranging from the submicrometer to the micrometer scale has become a great challenge. Calcium disilicide (CaSi2) Zintl phase is by far the precursor material used for the preparation of SiNSs via topochemical deintercalation of calcium by thermal treatment with metal chlorides [2] and by soft chemical exfoliation in the presence of

K or I2 as redox-assistants [3,4]. However, the synthesized silicene are highly unstable under ambient conditions and are prone to random oxidation and surface attachments, which make difficult its potential utilization. Thus, the surface functionalization of SiNSs, expected to provide stable materials in air-ambient, has been recently explored lately by modifications of layered polysilane Si6H6 with organic compounds [5,6]. However, no crystalline phase was reported. In this work, we introduce an easy and direct functionalization approach of novel stable crystalline SiNSs by exfoliation of CaSi2 with alkyl halides. For the first time, the dielectric proprieties of such bi-dimensional silicon-based materials were evaluated. Keywords: silicene, layered crystalline nanosheets, functionalization, dielectric application 1- H. Zhang, M. Chhowalla, Z. Liu, Chem. Soc. Rev. 47, 3015 (2018). 2- X. Meng, P. Yuan, K. Sasaki, K. Tsukamoto, S. Kusazaki, Y. Saito, Y. Kumazawa and H. Tatsuoka, e-J. Surf. Sci. Nanotech. 16, 218 (2018). 3- M. R. Tchalala, M. Ait Ali, H. Enriquez, A. Kara, A. Lachgar, S. Yagoubi, E. Foy, E. Vega, A. Bendounan, M. G. Silly, F. Sirotti, S. Nitshe, D. Chaudanson, H. Jamgotchian, B. Aufray, A. J. Mayne, G. Dujardin and H. Oughaddou, J. Phys.: Condens. Matter. 25 44200 (2013). 4- J. Liu, Y. Yang, P. Lyu, P. Nachtigall, Y. Xu, Adv. Mater. 30, 1800838 (2018). 5- H. Nakano, T. Ikuno, Appl. Phys. Rev. 3, 040803 (2016). 6- A. Lyuleeva, P. Holzmüller, T. Helbichb, M. Stutzmannc, M. S. Brandtc, M. Becherera, P. Luglid, B. Rieger, J. Mater. Chem. C, 6, 7343 (2018).

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PP23 A comparative study on the effect of corona discharge and dielectric barrier discharge treatment on polypropylene films A. Bougharouata aUniversité Akli Mohand Oulhadj de Bouira, Faculté des Sciences et des Sciences Appliquées, Département de Génie Electrique, Bouira 10000, Algeria

+ Author for correspondence: [email protected]

In many polymer applications, hydrophobicity and barrier properties are of great interest in recent years. These applications include packaging films, electrical cables, textiles, non- woven materials, flat panel displays and corrosion protection [1-2]. Polypropylene films (PP) have been used today in many applications because of their good physicochemical and electrical properties, including high mechanical strength, low dielectric constant and good thermal stability and chemical resistance [3-4]. The study of surfaces properties of Polypropylene films after their exposure to an electric discharge (corona discharge and dielectric barrier discharge) has been investigated. The study of the effect of the treatment by corona and dielectric barrier discharge on polypropylene films surface was carried out by the study of the evolution of the surface energy through the measure of the contact angle and by chemical analysis through FTIR/ATR spectroscopy. Surface energy and its components are calculated using the Owens and Wendt model. The results show that the corona discharge treatment induces a rapid reduction in the contact angle compared to that recorded with the dielectric barrier discharge treatment. The decrease in the contact angle with the treatment time and with the increase in the applied voltage of the discharge and therefore an increase in surface energy due to the increase in its polar component is explained by the fact that the treatment by induces a modification of the polypropylene surface resulting in an increase in the properties hydrophilic film (better adhesive properties). The discharge produces activated neutral species reacting with the surface of the sample to create functional functions responsible for wettability [5]. The FTIR/ATR spectroscopy analysis revealed the appearance of hydroxyl (-OH) and carbonyl groups (C=0), the intensities increase with increasing peak voltage. These groups induce an improvement in the surface wettability properties. Keywords: Polypropylene films, corona discharge, dielectric barrier discharge, surface treatment, Surface energy, wettability, FTIR 1- Z. Ziari, S. Sahli, A. Bellel, I. Savin, Y. Segui, P. Raynaud, "Surface analysis of corona discharge treated polypropylene films", 18 th International Symposium on Plasma, August26-31, 2007 Kyoto-Japan. 2- Z. Ziari, I. Nouicer, S. Sahli, S. Rebiai, A. Bellel, Y. Segui, P. Raynaud, ― Chemical and electrical properties of HMDSO plasma coated polyimide ‖, Vacuum 93 (2013) 31-36. 3-Latthe, S.S., Imai, H., Ganesan, V. and VenkateswaraRao, A. (2010) ‗Porous superhydrophobic silica films by sol–gel process‘, MicroporousMesoporous Mater., Vol. 130, pp.115–121.

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4-Drabik, M., Kousal, J., Pihosh, Y., Choukourov, A., Biederman, H., Slavinska, D., Mackova, A., Boldyreva, A. and Pesicka, J. (2007) ‗Composite SiOx/hydrocarbon plasma polymer films prepared by RF magnetron sputtering of SiO2 and polyimide‘, Vacuum, Vol. 81, pp.920–927. 5-Z. Ziari, A. Bellel, S. Sahli, P. Raynaud, Y. Segui, "A comparative study on the effect of VUV radiation in plasma SiOx-Coated polyimide and Polypropylene films", 3th Coatings Science International COSI 2007, Noordwijk, en Holland du 25 au 29 Juin 2007.

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PP24 Effect of precursor concentration and annealing temperature on the structural, optical and electrical properties of MgO thin films prepared by sol-gel method: dip-coating. H.Djaaboubea,+, R.Aouatia, A.Bouabeloua aConstantine University, Exacts Sciences Faculty, Physics Department, Constantine, Algeria + Author for correspondence: [email protected]

MgO thin films were prepared on glass substrates by a simple sol-gel method (dip-coating) using magnesium acetate tetrahydrateMg(CH3COO)2.4H2O as precursor. Solutions of 1.5M, 1.1M and 0.7M consist of magnesium acetate dissolved in methanol with addition of few drops of nitric acid. The aim of this work is the study of the effect of concentration and annealing temperature on optical and structural properties of MgO dielectric TCO thin films. The microstructure and optical properties of resulting thin films were investigated by the X- ray diffraction, the Fourier transformed infrared spectroscopy (FTIR), the force atomic microscope (AFM) and the UV-Vis transmittance techniques. The analysis shows that obtained magnesium oxide thin films crystallize in cubic structure for all specimens. The MgO the optical gap of MgO thin films increases with the decrease in concentration from 2,81 eV to 3,74 eV for 1.5M and 0.7M respectively. Moreover, the band gap decrease with increasing of annealing temperature.The transmission of layers varies respectively between 80 and 90% for samples of low concentrations 0.7 M and 1.1 M where is lower (~ 50%) for the high concentration 1.5 M.The MgO absorption peaks are expected in the range of 400-600cm- 1 region which are associated with the longitudinal optical (LO) phonon modes of MgO lattice. Keywords: magnesium oxide, magnesium acetate, so-gel, UV-Visible,AFM, FTIR

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PP25 Оrganic – inorganic hybrids, obtained by sol-gel approach at different inorganic catalysts V. Ilchevaa, V. Boeva, M. Dimitrovaa, E. Lefterovaa, T. Petkovaa a Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev str. bl.10, 1113 Sofia, Bulgaria + Author for correspondence: [email protected]

Urea-cross-linked polyether-siloxane hybrids with different length of polymer segments were synthesized through a sol-gel process uses ethanol as a solvent. The longer polymer chain hybrid was prepared from a monomer obtained by reaction of 1 mol of 3-(isocyanatopropyl) triethoxysilane (ICPTES) and 2 moles of double polyetheramine (Jeffamine) and that of a shorter chain - from a monomer, obtained by reaction of 1 mol of ICPTES and 1 mol of 3- aminopropyl triethoxysilane (APTES). Several inorganic acids were tested as catalysts for initiation of hydrolysis and condensation of the modified alkoxysilane monomers. The prepared samples were characterized by X-ray diffraction (XRD), FTIR and Scanning Electron Microscopy (SEM). It has been established that structure of the materials is influenced not only by the composition of the monomer, but also by the type of the catalyst. An important point is the presence of OH and H-O-H bonds in the structure, which is a prerequisite for good ionic conductivity of the materials. The present study provides that the incorporation these acids as active ingredients is perspective for fabrication of proton conducting polymer membranes for hydrogen fuel cells operating in the low temperature range. Keywords: Оrganic-inorganic hybrids, ureasil, sol-gel

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PP26 Study of spinel ferrite by ResonantNuclear ScatteringManganese-Iron notstoichiometric A. Benlallia,+ aRadiation Physics Laboratory, Physics Department,University BadjiMokhtar-Annaba Annaba, Algeria + Author for correspondence: [email protected]

The Resonant Nuclear Scattering has revealed the directional order that forms in the spinelferrites due to anisotropic distribution of Fe2+ and Fe3+ to the local direction of magnetization. We undertook to conduct a study on ferrites of composition:

= vacancies,

These compounds are then called lacunar spinel‘s. Generally the gaps are located in the octahedral sites, however their presence in tetrahedral sites is reported. For example, the oxidation of Fe3O4 magnetite leads to the formation of γ-Fe2O3 and to the appearance of cationic vacancies according to the following charge equilibrium: 3 Fe2+ → 2 Fe3+.The spectra were made on two kinds of samples: quenched and slowly cooled at different temperatures. The results show that it is possible to possible to distinguish at least three sites according to the values of 훼: an octahedral site (O) occupied by the 3+ 2+ 3+ 2+ Fe and Mn ions, which will be designated by (Fe )O(Mn )O,a tetrahedral site (T) or 2+ 3+ (Fe )T, and a tetrahedral site (T) or (Fe )T. The variation of intensity of the octahedral site according to 훼, and the differences of variation according to the cooling conditions suggest 3+ the existence of a partial order among the nearest neighbours of the site (Fe )O of an ion 3+ (Fe )T, which will make good account of the directional order.

Keywords: SpinelFerrite, Resonant Nuclear Scattering, Iron ore, spinel phase, Directional order.

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PP27 Structural and Magnetoelectrical properties of La0.6Y0.1Ba0.2Sr0.1MnO3 manganite F. Meriche,a,+ N. Mahamdioua,b,+ I. Belal,a S.P. Altintas,c N. Soylu,c C. Terzioglu,c aLEM, Department of Physics, Mohamed Seddik Ben Yahia University, Jijel, Algeria bLEND, Faculty of Science and Technology, Mohamed Seddik Ben Yahia University, Jijel, Algeria CDepartment of Physics, Faculty of Arts and Sciences, AIB University, Bolu14280, Turkey + Author for correspondence:+ [email protected] & [email protected]

Perovskite manganite compounds with stoechiometric formula ABO3 (A: Lanthanum and B: manganese), have drawn significant interest for use in resistive switching devices, magnetic information store, solid oxide fuel cells, reduction catalyst, spintronic and biomedical applications. These materials possess a variety of fascinating electronic and magnetic properties [1, 2]. In this work, we explore the structural, microstructural, electrical and magneto-transport properties of La0.6Y0.1Ba0.2Sr0.1MnO3 perovskite manganite elaborated by the solid state reaction process. Crystal structure and phase purity of the obtained compound were analyzed via X-ray diffraction (XRD). The recorded diffractogram refined by Fullprof program demonstrate that La0.6Y0.1Ba0.2Sr0.1MnO3 compound was crystallized in a single phase orthorhombic structure with the space group Pnma (62). Scanning electron microscope (SEM) analysis shows that the LYBSMO sample is constituted from square-shaped grains with distinguishable grain boundaries. Energy-dispersive X-ray spectroscopy (EDS) analysis approves the high purity of our compound and confirms the presence of all the constituent elements. Temperature dependence of electrical resistivity in the range 20-300 K is carried out by the standard four probe technique. Both zero and 1 tesla applied magnetic field curves exhibit a metal-insulator transition around 240K. The applied magnetic field decreases the resistivity values in the entire temperature range indicating the magnetoresistive character of the studied sample. The electrical resistivity curves show an upturn at very low temperature. It is getting at 30K and shifts to the lower temperature with applying one tesla magnetic field to 23 K. Fitting the resistivity curves in the metallic regime (T<135K) revealed that the conduction is governed by the contribution of the residual resistivity, the weak localization interaction and the electro-electron interaction. No electron-phonon interaction was detected. Keywords: Simple perovskite manganites, structure, morphology, electrical resistivity, magneto-transport properties, magnetoresistance. 1- I. A. Abdel-Latif , J. Phys. 1, 15 (2012). 2- T.A. Kaplan, S.D. Mahanti, Physics of Manganites, Springer Science and Business Media 1999.

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PP28 Electrical impedance spectroscopy (EIS) as a tool to investigate the complexation process of Gum Arabic and Chitosan solution: a review S. Zaima, b, +, R. EL Mozninea*, R. Nmilab, H. Rchidb aLaboratory Physics of Condensed Matter (LPMC). University Chouaib Doukkali, El Jadida, Morocco. bLaboratory of Biotechnology and Valorization of Vegetal Resources. University ChouaibDoukkali, 24000, El Jadida, Morocco.

+ Author for correspondence: [email protected] and [email protected]

Electrical impedance spectroscopy is a powerful technique to investigate the electrical properties of a large variety of materials. This technique has been used by Yadav et al. [1] to study the complexation process between gum Arabic and chitosan in bulk solution. EIS data were obtained for different mass ratios (RGA/Ch) at frequencies ranging from 1Hz to 1000 Hz. Randles circuit was used to fit experimental data and to estimate resistance and capacitance parameters as a function of RGA/Ch. These parameters showed sharp changes at the isoelectric point of the complex coacervates. The capability and accuracy of the EIS were compared with that obtained via traditional potential measurements. The results indicated that the EIS technique can be used at specific frequency ranges as a practical method for monitoring the complexation process between biopolymers. However; it seems that the analysis of the impedance data was limited only to the complex impedance function. Therefore; this paper presents a review for a deep investigation on various electrical properties such as complexes impedance; modulus; admittance and capacitance. In this study; a simulation was performed in order to generate impedance complex data using electrical parameters extracted from the equivalent circuit since this latter showed a good fit for the experimental data. Moreover; an extrapolation in the low-frequency region was carried out to further investigate the behavior of the relaxation and the diffusion process. The analysis of impedance data using the bode plot allowed us to the identification and the de-convolution of a different process. Other electrical functions such as complex conductivity and permittivity were investigated using the Bode plot to further investigate the different processes. This review could provide considerable information about the user and guidance for the analysis of various electrical complexes functionsas well as for monitoring the complexation process between biopolymers. Keywords: Complexation process; Electrical impedance spectroscopy; Equivalent circuit; Complexes impedance; modulus; admittance and capacitance.

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1-C. Roldan-Cruz, J. Carmona-Ascencio, E.J. Vernon-Carter, J. Alvarez-Ramirez. Colloids and Surfaces A: Physicochem. Eng. Aspects 495 (2016) 125–135

PP29 Electrical studies of reduced graphene oxide/epoxy polymer nanocomposites Y. Niouaa, B. M. G.Melob, P. R. Prezasb, M. E. Achoura, M. P. F. Gracab, L. C. Costab, A. Fattoumc aLASTID Laboratory, Department of Physics, Sciences Faculty, University Ibn Tofail, BP 133, 14000, Kenitra, Morocco bI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal cResearch Unit of Materials, Environment and Energy, Sciences Faculty of Gafsa, 2112 Gafsa, Tunisia + Author for correspondence: [email protected]

In this work, we present an analysis of the d.c. and a.c. electrical conductivities of a composite material synthesized by mixing reduced graphene oxide (rGO) particles in an epoxy resin polymer (DGEBA), in the 240 to 400 K temperature range and 102 to 106 Hz frequency [1]. We found that the d.c. electrical conductivity of the samples is strongly related

to the rGO content, indicating a percolating behavior, with a critical percolation threshold, c ≈ 4 %. The critical behavior of the d.c. electrical conductivity as a function of the temperature indicates a strong positive temperature coefficient (PTCR) and a negative temperature

coefficient (NTCR) [2] of resistivity, below and above the transition temperature Tg, respectively. Moreover, the results showed that the d.c. conductivity obeys the Arrhenius law and the a.c. electrical conductivity is both frequency and temperature dependent and follows the Jonscher‘s power law. Keywords: Composites materials, graphene; electrical conductivity; PTCR, NTCR; Glass Transition. 1- Nioua. Y, El Bouazzaoui. S, Melo. B.M.G, Presas. P.R, Graca. M.P.F, Achour. M.E, Costa. L.C, Brosseau. C. J Mater Sci. 52 (2017) 13790. 2- Costa. L.C, Chakki. A, Achour. M.E, Graca. M.P.F. Physica B. 406 (2011) 245. 3-

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PP30 Numerical simulation of combined heat transfers through hollow bricks wall B. Jamal, M. Boukendil*, L. El Moutaouakil, A. Abdelbaki LMFE, Department of Physics, Cadi Ayyad University, Faculty of Sciences Semlalia, B.P. 2390, Marrakesh, Morocco + Author for correspondence: [email protected]

The present study aims to investigate coupled heat transfer by natural convection, conduction and surface radiation through hollow bricks wall. The outside vertical surface is submitted to an incident solar flux and outdoor environment temperature while the inside surface is submitted to indoor environment temperature. The effects of the incident solar flux, the thermal conductivity and emissivity on the heat transfer through the considered structure were examined. The results show that the thermal conductivity and emissivity have a strong impact on the overall heat transfer through the wall. the use of hollow bricks with low thermal emissivity and low conductivity of solid walls, which will greatly help in reducing the energy consumption in buildings.

Keywords: hollow bricks wall, combined heat transfer, natural convection, thermal conduction, surface radiation, thermal resistance, numerical simulation

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PP31 Studies on the Electrical and Thermal properties of PMMA/Carbon-dots nanocomposites Z. El Ansarya, I. Bouknaitira, S. S. Teixeirab, L. Kreita, A. Pannielloc, P. Finic, M. Striccolic, L. C. Costab, M. E. Achoura,+, M. El Hasnaouia a LASTID Laboratory, Physics Department, Faculty of Sciences, Ibn Tofail University, B.P:133, 14000, Kenitra, Morocco. bI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal. cCNR-IPCF-Bari Division, c/o Chemistry Department, University of Bari, Via Orabona 4, 70126, Bari, Italy + Author for correspondence: [email protected]

Studies of thermal and electrical properties of original nanocomposite materials, based on poly(methyl methacrylate) loaded with synthesized colloidal carbon dots nanoparticles were performed. Differential scanning calorimetry allowed to identify the glass transition temperatures of heating and cooling which decrease with carbon-dots nanofillers concentration, showing a plasticizing effect on the polymer structure. The frequency dependent of AC electrical conductivity shows a change in behavior at a specific frequency, which was modeled using the Jonscher‘s power law. The Nyquist representation of the electric modulus permits to identify two dielectric relaxations. The first one, appearing at low-frequency domain, was attributed to the Maxwell–Wagner–Sillars polarization whereas the second one, appearing at high-frequency domain, was associated to the α-relaxation contributed by main-chain movements in PMMA polymer. The activation energies calculated from the electrical conductivity and relaxation processes were calculated using the Arrhenius equation.

Keywords: Carbon-dots, polymer matrix, electrical conductivity, Havriliak-Negami model.

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PP32 Design the antenna with new dielectric substrate for new generation (5G) Y. El Hasnaoui, T.Mazri Electrical System and Telecommunication Engineering, National School of Applied Sciences, Ibn Tofail University; Kenitra, Morocoo + Author for correspondence: [email protected], [email protected]

Recent research has shown that choosing the right substrate for dielectric materials can enhance the antenna performance for the next generation of wireless communications. In this work, we presentthe results of the comparative studies on the performances of the microstrip antennas for the new generation (5G) based on specific characteristics of a dielectric substrate. The main objective of this work is to choose the best properties of a dielectric material to design antennas with the best characteristics. The results obtained are discussed and the performance comparison (gain, bandwidth, directivity and radiation pattern) of a rectangular patch antenna is established in order to show the effect of certain parameters of the antenna on its characteristics. Keywords: Antenna, dielectric substrate, new generation (5G).

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PP33 Phase transition in high-mobility Si MOSFETs L. LimounyA,+, A. EL KaaouachiA, S. DlimiA aPhysics Department, University Ibn Zohr, Faculty of Sciences, B.P 8106, Hay Dakhla, 80000 Agadir, Morocco. Author for correspondence: [email protected]

We study the electrical conductivity of high-mobility Si-MOSFETs, in the vicinity of the 11 -2 critical carrier density nsc of the metal-insulator transition where nsc ≈ 0.72 x 10 cm .

Around nsconboth sides of the metal-insulator transition, the conductivity shows strange linear temperature (T) dependence. Analysis of data of the extrapolated conductivity from the linear

T dependence at T = 0K ζ0 as a function of the carrier density nsreports existence of two modes with different ζ0(ns) dependence. This result demonstrateexistence oftwo different phases. A severe transition between these two regimes occurs at nsc. We suggest the existence of a possible phase type of transition in these Si-MOSFETs. Keywords: Metal-insulator transition, electrical conductivity, high-mobility 2D Si-MOSFETs, critical carrier density, percolation transition, phase transition. 1- V. M. Pudalov, G. Brunthaler, A. Prinz, G. Bauer, JETP 68, 442 (1998). 2- P. Brussarski et al., NatCommun 9, 3803 (2018). 3- S. V. Kravchenko, G. V. Kravchenko, J. E. Furneaux, V. M. Pudalov, M, D‘Iorio, Phys. Rev. B 50, 8039 (1994). 4- T. Knighton et al., Phys. Rev B 97, 085135 (2018). 5- S. Das Sarma and E. H. Hwang, Phys. Rev. B 69, 195305 (2004).

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PP34 Structural, electrical, and impedance spectra analysis of PMMA/PPy composite materials N. Ariboua,+, S. Barnossa, Y. Niouaa, M. El Hasnaouia, M.E. Achoura, L.C. Costab aLASTID Laboratory, Physics Department, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco bI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal. + Author for correspondence: [email protected]

Structural characterization and dielectric properties of poly(methylmethacrylate)/polypyrrole composites were performed. The results of X-ray diffraction permitted to calculate the crystallinity index, showing a remarkable increase with filler concentrations. The impedance spectra and electrical conductivity of the composites, for filler fractions above the apparent percolation threshold, were analyzed using Cole-Cole modeland Jonscher power law, respectively, in the frequency range from 100 Hz to 1 MHz and temperature from 290 to 380 K. The dependence of temperature of bothn and α exponents give an idea about the transport mechanisms related to these composites. Whereas, the variation of DC conductivity and relaxation time as a function of temperature were analyzed using the Arrhenius equation, showing the thermal activated process.

Keywords: Composite, Structural characterization, Cole-Cole model, Jonscher power law.

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PP35 Structural, optical, dielectrical and electrical properties of Aloe Vera leaf exudate: Application as natural dye in solar cell S. K. Hnawia,b, A. Nayadb, H. Aitdadsa, A. Agdada,M.Afqirc, L. Nkhailia, L. EL Firdoussib, A. Oueriagliaand M. Ait Alib, + aLaboratory of Nanomaterials, Energy and Environment (LNEE), Cadi Ayyad University, Faculty of sciences Semlalia (UCA-FSSM), B.P. 2390 - 40000 Marrakech, Morocco. b Coordination Chemistry Laboratory (LCCC), Cadi Ayyad University, Faculty of sciences Semlalia (UCA-FSSM), B.P. 2390 - 40000 Marrakech, Morocco. c Laboratoire des Sciences des Matériaux Inorganiques et Leurs Applications, Faculté des Sciences Semlalia (UCA-FSSM), B.P. 2390 - 40000 Marrakech, Maroc. *Corresponding author. E-mail: [email protected] .

In this study, the Aloe vera leaf exudate as yellow-orange solid (EAS) collected from the leaves of Aloe Vera plant (aloe barbadensis miller) was used as a cheap and natural sensitizer thin film to build a planar heterojunction solar cell with zinc oxide (ZnO) thin film as an electron selective layer. Optical and structural properties of the films were analyzed using X- ray diffraction, UV-Vis absorption and Fourier Transform Infrared (FT-IR) spectroscopy. Dielectrical properties were analyzed by impedance spectroscopy. The ZnO/EAS solar cell was fabricated by direct deposition of silver (Ag) contacts on the EAS films. The band gap was found to be 1.88 eV. The electrical properties of the cells investigated by current– voltage (I–V) measurements showed an important open circuit voltage (Voc) of 0.74 V and a great fill factor (FF) of 0.70. Keywords: natural dye, solar cell, aloe vera exudate, planar heterojunction, Current–voltage (I–V), Capacitance-Voltage (C-V).

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PP36 SANS characterizationand impedance spectra analyses of polyester/graphite composite R. Belhimriaa, S. Boukheira,b, Z. Samira, A. Lenc,d, M. El Hasnaouia,+, M.E. Achoura, N. Ébere, L.C. Costaf, A. Oueriaglib aLASTID Laboratory, Physics Department, Faculty of Sciences, Ibn-Tofail University, BP 133, 14000 Kenitra, Morocco. bLaboratoire LN2E, Faculté des Sciences, Université Cadi Ayyad, B.P. 2390, 40000 Marrakech, Morocco cNuclear Analysis and Radiography Department, Centre for Energy Research, H-1525, Budapest, P.O.Box 49, Hungary dCivil Engineering Department, Faculty of Engineering and Information Technology, University of Pécs, BoszorkányStr 2, 7624 Pécs, Hungary. eComplex Fluids Department and Neutron Spectroscopy Department, Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, H-1525, Budapest, P.O.Box 49, Hungary fI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal + Author for correspondence: [email protected]

This work presents a study on the electrical and structural properties of composites based on graphite dispersed into a polyester matrix. Their structural characterisation was performed using small-angle neutron scattering (SANS), providing information about the dispersion of fillers within the matrix. Electrical measurement was carried out in the frequency range from 1 Hz to 10 MHz and temperature from 30 to 100 °C.It was found that when the filler concentration is above the percolation threshold, the positive temperature coefficient in resistivity phenomena is identified.The mechanism responsible for this behavior was attributed to the tunneling effect. The Nyquist representations of the complex impedance spectra were modeled using the Cole-Cole model. The obtained values of the α exponent that gauges the broadening of the loss spectrum are near zero, suggesting a behavior close to a model of a single relaxation time. Furthermore, the relaxation time versus temperature follows an Arrhenius behavior. Keywords: Composite, small angle neutron scattering, impedance spectra, Cole-Cole model.

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PP37 Thermal and dielectric behaviorof ternary composites Carbon nanotubes/Graphite/Polyester Z. Samira,+, R. Belhimriaa, S. Boukheira,b, S. SoretoTeixeirac, M.E. Achoura, A. Anson- Casaosd, M.El Hasnaouia, L.C. Costac, A. Lene,f, J.M. Gonzalez-Dominguezd aLaboratoire LASTID, Faculté des Sciences, Université Ibn Tofail, B.P. 133, 14000 Kénitra, Morocco bLaboratoire LN2E, Faculté des Sciences, Université Cadi Ayyad, B.P. 2390, 40000 Marrakech, Morocco cI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal dInstituto de Carboquímica ICB-CSIC, Miguel Miguel Luesma Castán4, 50018 Zaragoza, Spain eNuclear Analysis and Radiography Department, Centre for Energy Research, H-1525, Budapest, P.O.Box 49, Hungary fCivil Engineering Department, Faculty of Engineering and Information Technology, University of Pécs, BoszorkányStr 2, 7624 Pécs, Hungary + Author for correspondence: [email protected]

Ternary composites composed of a polyester matrix were synthesized with the combined inclusion of two types of fillers, namely, multi-walled carbon nanotubes and graphite.Thermal analysis was performed, using thermogravimetric analysis and differential scanning calorimetry, which allowed us to observe changes in the glass transition temperatures and degradation temperatures of the composites. Electrical and dielectric measurements were carried out in a frequency range from 100 Hz to 1 MHz and temperatures from -33 to 107 ºC. The dielectric response was analyzed using the electrical modulus Cole-Coleformalism, depending on the temperatures and on the concentration of filler in the polymer matrix. Keywords: Ternary composite, polyester, carbon nanotube, graphite, Cole-Cole.

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PP38 Electrical and Dielectric Properties of Gt/CNT/Engine Oil Nanofluids S. Barnossa, B. M. G. Melob, M. El Hasnaouia, +, M.E. Achoura, L.C. Costab, M.P.F. Graçab, aLASTID, Department of Physics, Faculty of Sciences, University Ibn Tofail, BP 133, 14000 Kenitra, Morocco bI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal + Corresponding author: [email protected]

Studies on the electrical and the dielectric properties of nanofluids based on commercial engine oil loaded graphite (Gt) and carbon nanotubes (CNT) nanoparticles have been performed. The electrical conductivity and impedance spectra were measured in the frequency range from 100 Hz to 1 MHz and temperatures from 300 and 400 K using impedance spectroscopy. The frequency-dependence of the electrical conductivity is analyzed using the Jonscher‘s power law and the Nyquist representations of the complex impedance spectra are modeled using the Cole-Cole model. The results suggest that the presence of the nanotubes greatly affect the dielectric properties of the oil as a result of polarization phenomenon induced by these nanoparticles. The temperature dependence of both DC conductivity and relaxation process behaviors, using the Arrhenius equation indicates that the conduction processes is thermally activated. Keywords: Nanofluids, Carbon nanotube, Impedance spectroscopy, Dielectric relaxation, Jonscher power law, Cole-Cole model.

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PP39 Analysis of the dielectric function of Aluminum (Al) in bulk and nanometric states. B. A. Hammoua ,A. El kaaouachia,+ , A. El Oujdi b, A. Echchelhb , S. Dlimic aMaterials and Physicochemistry of the Atmosphere and Climate Group, Faculty of Sciences of Agadir, BP 8106, 80000 Agadir, Morocco b Laboratory of Energetic Engineering and Materials, Faculty of Sciences Ibn Tofail, Kenitra, Morocco cPhysics Department, Faculty of Sciences of Agadir, BP 8106, 80000 Agadir, Morocco. + Author for correspondence: [email protected]

In this work, we model the dielectric function of Aluminum (Al). The modeling has been performed on Al in bulk and in nanometric states. The dielectric function is presented as a complex number with a real part and an imaginary part. First, we will model the experimental measurements [1] of the dielectric constant as a function of the pulsation ω by appropriate mathematical functions in an explicit way. In the second part we will highlight the contributions to the dielectric constant value due to intraband and interband electronic transitions. In the last part of this work we model the dielectric constant of this metal in the nanometric state using several complex theoretical models such as the Drude Lorentz theory [2] and the Drude two-point critical model [3]. We shall comment on which model fits the experimental dielectric function best over a range of pulsation.

Keywords: Modeling bulk and nanometric dielectric constant, Aluminum, interband transitions, intraband transitions, IR pulsations.

1- Aleksandar D. Rakić, Aleksandra B. Djurińić, Jovan M. Elazar, and Marian L. Majewski, Applied Optics 37, 5271-5284 (1998). 2- A.Vial and T. Laroche, J. Phys. D. Appl. Phys. 40,7152-7158 (2007). 3- A. Vial and T. Laroche, Appl. Phys. B 93, 139-149 (2008)..

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PP40 Structural, dielectric and impedance spectroscopy analysis of lead free (Ba0,85Ca0,15Zr0,1Ti0,9O3) ceramics synthesized by sol-gel method a a b a a a S.Khardazi , D.Mezzane , Y.Gagou , M.Amjoud ,S.Ben moumen ,S.Belkhadir a Laboratoire de la matière condensée et nanostructures LMCN, F.S.T.G. Université Cadi Ayyad, BP 549, Marrakech, Morocco b Laboratoire de physique de la matière condensée LPMC, Université Jules Verne de Picardie, 33 rue Saint-Leu, 80039 Amiens Cédex, France + Author for correspondence: [email protected]

In recent decades, there is an increasing attention paid to ferroelectric and ecological materials, both in scientific research and technology developments. In the present work, a lead free ceramics Ba0,85Ca0,15Zr0,1Ti0,9O3 (BCZT) was prepared by sol-gel method. Morphological and structural properties of BCZT were investigated by SEM and XRD technique confirmed by Raman spectroscopy at room temperature, respectively. Dielectric characteristics were analyzed by Impedance spectroscopy. Rietveld refinement indicates the formation of a single phase compound with a tetragonal structure of space group P4mm. The ceramics sintered at 1350°C exhibits a dense microstructure. The dielectric measurements of BCZT were studied as a function of temperature in the frequency range of 100Hz-500 kHz. The variation of dielectric constant (ε‘) shows a maximum value of ~4700 at the ferroelectric-paraelectric phase transition (Tc= 64°C). The Diffuse nature of the transition is well described by Santos– Eiras phenomenological model. Impedance spectroscopy analysis over the frequency range of 100Hz to 500 kHz presents mainly grain and grain-boundary contribution above 266°C. Keywords: Ferroelectric materials, Sol-gel Method, dielectric measurements. 1- P. Dubois, P.Clair, Phys. Rev. 120, 622 (2015). 2- O. Vendik, G., Zubko, Journal of Applied Physics, 88 (2000). 3- K. T. Goto T., Shintani, Journal of American Ceramic Society, 74, 4, 849 (1991).

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PP41

Anisotropy of conductivity and nonlinear effects in ε-GaSe crystals M. Al-hattab,a K. Rahmani,a,+ L. Moudou,a M. Khenfouchb a Department of Physics, Faculty of Polydisciplinary (ERPTM), B.P 503, 23000, Beni Mellal, Morocco. b Africa Graphene Center. + Author for correspondence: [email protected]

In this paper, we have calculated the optical conductivity of the ε-GaSe layer. The calculation is based on the DFT method using the CASTEP code. This study is carried out in a field which extends energetically from 10 meV to 35eV, and they were measured for a polarization // and ⊥ with the axis c. The position of the main peaks is different for these two cases, which shows an anisotropic optical behavior of this material, because of the symmetry of a single layer, rather by the symmetry resulting from the stacking of the layers.

Keywords: ε-GaSe, conductivity, Anisotropy.

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PP42

Study on the effect Er dopant on the optoelectronic properties of nanostructured ZnO M. Achehboune,a,b,+ M. Khnefouch,b,c I. Boukhoubza,a,b B M. Mothudi,c, I. Zorkani,a A. Jorioa a Sidi Mohammed Ben Abdellah University, Faculty of Sciences Dhar el Mahraz, Laboratory of Solid state Physics, Group of Nanomaterials and Renewable Energies, PO Box 1796 Atlas Fez 30 000, Morocco. b Africa Graphene Center, Physics department, Eureka building, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue Florida 1709, Johannesburg, South Africa. cDepartment of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa. + Author for correspondence: [email protected]

Undoped and Rare earth (Er) doped ZnO nanorods was studied with an aim to enhance and control its multifunctional properties for various optoelectronic properties. After synthesizing well-defined Er doped ZnO nanorods by hydrothermal method, evaluation of structural and optical characterstics of synthesised ZnO nanorods was performed. The results obtained by XRD spectrum indicated the presence of hexagonal (wurtzite) structure for both pure and Er doped ZnO NRs with additional cubic phase of Er2O3 that appeared in the doped sample. The size and lattice strain of particles have increased after doping with Erbium. The SEM images showed that the samples have flower-like ZnO nanorods. The optical investigations showed a strong absorbance in UV region. The optical band gap energy (Eg) of ZnO nanostructures has been determined from the analysis of UV absorbance spectra and found to be decreased with increasing Er doping concentration.

Keywords: ZnO nanorods, Erbium, hydrothermal method, Band gap energy.

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PP43

Graphene oxide coated flower-shaped ZnO NRs for UV detection application I. Boukhoubzaa,d,+, M. Khenfouchb,d, M. Achehbounea,c, L. Leontiec, A. Carlescuc, C. Dorofteic, B. M. Mothudib, I. Zorkania and A. Jorioa a Sidi Mohammed Ben Abdellah University, Faculty of Sciences Dhar el Mahraz, Laboratory of Solid state Physics, Group of Nanomaterials and Renewable Energies, PO Box 1796 Atlas Fez 30 000, Morocco b University of South Africa, Department of Physics, Private Bag X90, Florida, 1710, South Africa cAlexandru Ioan Cuza University of Iasi, Faculty of Physics, Bulevardul Carol I, nr. 11, Iasi 700506, Romania d Africa Graphene Center, Department of Physics, College of Science, Engineering and Technology, Science Campus, University of South Africa, Cnr Christiaan de Wet & Pioneer Avenue Florida 1709, Johannesburg, South Africa. + Author for correspondence: [email protected]

The influence of graphene oxide coating on optical and photoluminescence properties of zinc oxide nanorods (ZnO NRs) has been investigated. The structural, morphological, optical and luminescence properties of the films were investigated . As revealed by XRD analysis, composites display a hexagonal wurtzite type structure with a (101) preferred grain orientation. The average crystallite sizes decreases from 45 to 40 nm after GO coating. The SEM study confirms successful coating of GO layers on flower-like ZnO nanostructures. The Raman analyses validated the hybridization of nanocomposite and the strong interaction between ZnO NRs and GO. The band gap of the ZnO NRs: GO nanocomposite is lower (2.95 eV) compared to that of ZnO NRs (3.11 eV), as determined from the analysis of UV absorbance spectra. The ZnO NRs:GO nanocomposite exhibits a broad PL band, from ~450 nm to ~750 nm, with a nearly white-light integrated emission and a chromaticity coordinate of (0.25, 0.34). Gaussian deconvoluted broad PL band exhibits three distinct sub-bands, associated with radiative recombinations in ZnO and GO.

Keywords: ZnO nanorods, graphene oxide, nanocomposite, optical properties

[1] I. Boukhoubza, et al. Graphene oxide/ZnO nanorods/graphene oxide sandwich structure: The origins and mechanisms of photoluminescence, Journal of Alloys and Compounds. 797 (2019) 1320–1326. [2] X. Ye, et al. A novel photoconductive UV detector based on ZnO/RGO composite with enhanced photoresponse performance Materials Letters 150 (2015) 126–129

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PP44 Effect of conduction band non-parabolicity on the intersubband transitions in GaInN/AlInN quantum well heterostructures L. Moudoua+, M. AL-Hattaba, K. Rahmania, M. Khenfouchb aFaculté Polydisciplinaire-Béni Mellal, ERPTM, Université Sultan Moulay Slimane, BP 592, 23000 -Morocco. b Africa Graphene Center Author for correspondence: moudou1993@@email.com

Quantum well heterostructures are the basic constituents of most optoelectronic devices. The main interest of this type of structure is the confinement of the carriers in the quantum well according to the direction of growth, which gives a discretization of the energy levels accessible to the carriers of charge. The bursting between these levels will determine the different transitions energy. The energy and the number of the confined levels depend on various parameters defining the structure namely: the thickness of the well, the thickness of the barrier, the energy of gap, the doping and the offset: the energy shift between the different bands of the well and the barrier. Under certain conditions, the confinement of electrons and holes in the same region of space leads to very significant quantum and optical efficiencies. The resulting devices (Led's, LD, QCL, QWIPs, ...) are used in various fields of application (Medicine, Telecom, Security, Military, Astronomy ...) We theoretically studied quantum confinement in the unstressed GaN / AlInN heterostructure, working within the framework of the envelope function model by adopting the approximation of the parabolic bands [1]. We used a finite difference numerical method to determine the energies and envelope functions of the hétérostructure [2,3]. The objective is the determination of the geometries whose intersubband transitions energies would allow the design of unipolar optoelectronic devices for applications in the terahertzic domain (0.4— 41.33 meV) on the one hand and on the other hand in the field of optical fiber telecommunications (800—933 meV) [4]. Our results show that it is necessary to consider geometries generating 4 confined levels to reach wavelengths for telecommunications applications. Indeed, the transition E14 allows us to have wavelengths λ = 1.44-1.54 μm for well widths Lw = 20-45 Å and the barrier Lb = 60 Å. And the transition E34 allows us to have a transitions of frequency ʋ = 9.86 THz corresponding to the terahertzic radiations for the critical geometry 6 / 2.5 / 6 nm. This geometry would thus satisfy the two desired domains. Keywords: Quantum well, absorption, confinement, telecommunications; 1- G.Bastard, « Wave Mechanics Applied to Semiconductor Heterostructures » les éditions de Physique, Paris, (1988). 2- A. Helman, «Puits et boites quantiques de GaN/AlN pour les applications en optoélectronique à λ≈1.55 μm », Thèse de l‘Univercité Paris VI Orsay (2004).

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3- N. Grandjean, B. Damilano, S. Dalmasso, M. Leroux, M. Laügt, J. Massies, J. Appl. Phys. 86, 3714(1999). 4- T. Takeuchi, S. Sota, M. Katsuragawa, M. Komori, H. Takeuchi, H. Amano, I. Akasaki, J. Appl. Phys. 36, L382(1997).

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PP46

Optical and electrical properties of some skin of tomatoes, apple and peppers C. N. Abouloula a, I. Bouknaitirb, A. Oueriagli a, L. C. Costa c, M. E. Achour b,+ aNanomaterials for Energy and Environment Laboratory (N2EL), Facultyof Sciences, Semlalia, P.O Box. 2390, 40000 Marrakesh, Morocco bLASTID Laboratory, Physics Department, Faculty of Sciences, Ibn Tofail University, B.P:133, 14000, Kenitra, Morocco cI3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal + Corresponding author: [email protected]

Vegetable skins have many properties that can be used to produce new materials. In this study, our work looks to exploit the bio-resources in the industry. This study reports the optical property of fresh and dried skin of tomato, potato and pepper. The study was carried out in the frequency range between 100 Hz and 1 MHz, at the temperature range from 300 K to 400 K. The optical transmittance measurements were performed using a Shimadzu UV-PC spectrophotometer in the 200–2800 nm range. Keywords: Optical poperties, electrical propeties, Skin, Tomatoes, Pepper, Apple

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PP47 Investigating the electrical transport mechanisms of natural phosphate/ pentafunctional epoxy resin composites A. Taoufik a, R. Hsissoub, S. S. Teixeirac, M. El Hasnaouia.+, M. E. Achoura, L. C. Costac, A. Elharfib 1LASTID Laboratory, Department of Physics, Sciences Faculty, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco 2 Laboratory of Agricultural Resources, Polymers and Process Engineering (LARPPE), Department of Chemistry, Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra,Morocco 3 I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal + Corresponding Author: [email protected]

An investigation on electrical transport mechanisms of composites materials based on novel pentafunctional epoxy resin matrix reinforced with different concentrations of natural phosphate (NPh) particles has been presented. The electrical properties were measured in the frequency domain 100 Hz - 1 MHz and temperature range from 200 to 400 K. The frequency- dependence of the electrical conductivity is analyzed using the Jonscher power law and the Nyquist representation of the electrical modulus spectra is modeled using the Cole-Cole model. The calculated relaxation parameters show that, with the increasing of the NPh particle concentrations, the composite becomes more heterogeneous. Furthermore, the relaxation time and the electrical resistivity were analyzed using the Arrhenius equation. Keywords: Composite, natural phosphate, electrical properties, Jonscher power law, Cole-Cole model

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PP48 Estimating of dew yield from the calcite dew condenser 1 1 2 M. Benlattar* , M. Mazroui , E. M. Oualim and A. Jalal

a Hassan II University, Faculty of Sciences Ben M‘sik, Department of Physics, 7955 Sidi Othman Casablanca. bHassan 1er University, High School of Technology of Berrechid, BP 218 Berrechid – Morocco + Corresponding author. E-mail: [email protected]

With the possibility of harvesting the coldness of the atmosphere as an inexhaustible thermodynamic resource, passive radiative cooling technology is used for many applications such as refrigeration, renewable energy harvesting and dew condensation. However, in this study, we focus on dew harvesting as a new-researched area. This paper presents an energy balance modelling approach to predict the nightly water yield from meteorological data in semi-arid region (Mirleft, Southern Morocco). The proposed approach provides a comprehensive report on a thin film of calcite mineral (CaCO3) that can be used as a selective shield allowing dew condensation during the night. The increased cooling of the exposed shield (condenser) was exploited using high IR emissivity of the calcite in the atmospheric window (8-13 microns). The dew harvesting happens when the temperature of a shield is below the dew point temperature. The average daily dew yield obtained varied from 0.75 to 1.2 L/m2 per night. The main goal of this paper was to estimate dew harvesting with high yield as a function of condenser temperature and thickness condenser. Keywords: Condensation, radiative cooling, Calcite, Harvesting dew, Dew yield

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PP49 Diamagnetic susceptibility, polarisabilityand photoionization cross section of a single dopant in GaAs core/shell Quantum Dot.

S. M’Zerd1,2,+, I. Zorkani1, E. Feddi2, M. Khenfouch3 1Groupe des Nanomatériaux et EnergiesRenouvelables, L P S, FSDM, BP 1796, Université Sidi Mohamed Ben Abdellah-Fès-Morocco 2LaMScI,Group of Optoelectronicof Semiconductorsand Nanomaterials, ENSET, Rabat, Morocco 3Africa Graphene Center, Physicsdepartment, Eureka building, CSET, UNISA-Florida Campus, Roodepoort, 1709. Gauteng. South Africa. + Corresponding author. E-mail: [email protected]

This paper reports a recent study on the diamagnetic susceptibility, polarisabilityand photoionization cross section (PCS) of a single dopant in GaAs core/shell Quantum Dot. The numerical calculations are performed for GaAs with Spherical and cylindrical shape, considering the position of the impurity and an infinite deep potential. Our numerical calculations reveal that all these fundamental parameters are deeply dependent on the core and shell radii The results show that the diamagnetic susceptibility increases with the reduction in dot sizes, strongly depends on size of the nanostructure, decreases with increasing the quantum dot size and tends towards the bulk limit (-1,1 a.u.). The study of the localization of the impurity inside the core/shell indicates that the Stark shift is more important when the impurity is positioned at the core/shell center and becomes less important when the donor moves toward the boundaries of the shell layer. In order to understand the optical responses during the photoionization of the donor dopant, we investigated the PCS under electric field, ionized donor position, and core/shell sizes. Keywords: core shell Quantum Dots , Diamagnetic Susceptibility, polarizability, photoionization cross section, Magnetic Field, Impurity.

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PP50 Resonant optical properties of AlGaAs/GaAs multiple-quantum-well under the effect of hydrostatic pressure

Y. Chrafih1,*, Kh. Rahmani1, M.Khenfouch2, O.Bajjou3, I. Zorkani4 1Faculty of Polydisciplinary, (ERPTM), BP 590, 23000 Beni Mellal-Morocco 2Department of Physics, University of South Africa, Private Bag X90, Florida, 1710, South Africa. 3Faculty of Sciences and Technologies, (LPM), BP 592, 23000 Beni Mellal-Morocco. 4Faculty of Sciences Dhar Mehraz, (LPS), Fès-Morocco Email: 1,* [email protected]

In this work, we investigated the effect of hydrostatic pressure on reflection in a heterostructure composed of N multiple quantum wells. The super-cellular structure is formed of a GaAs-based quantum well (QW) sandwiched by relatively thin AlxGa1-xAs barriers with a high x = 74% Al content. In our study, we evaluated the effect of changing the number of quantum wells on reflection. And calculate the theoretical transition energies for different excitons in the sample. The multiple quantum well structure used in this work formed by GaAs quantum wells separated by AlGaAs barriers. Bragg resonance was tuned and satisfied for normal light incidence.

Our results show that, due to the interference with light reflected from the bottom, the resonant part slightly distorted from the Lorentzian form. By increasing the number of wells N, the resonant part is obviously different from the Lorentzian form. Since the resonance, the levels of the different QW are electronically isolated. This spectral evolution is entirely due to the dependence of the radiative correction, which becomes more and more important as N increases. Under the effect of pressure, the reflection coefficient moves towards the high frequencies. We showed its effect on inter-band transitions. These optical properties also depend on the dopant concentration ratio and the quantum well width.

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PP51 Structural, and dielectric properties of BaO-K2O-TiO2-P2O5 glasses and its associated glass-ceramics E. Haily a, c +, L. Bih a,b, S. Yousfi a, A. El bouari c, B. Manoun d,e aEquipe Physico-Chimie la Matière Condensée (PCMC), Faculté des Sciences de Meknès, Maroc. b Département Matériaux et Procédés, ENSAM Meknès, Université Moulay Ismail, Meknès, Maroc. c Laboratoire Physico-Chimie des Matériaux Appliquées (LPCMA), Faculté des Sciences Ben M‘sik Casablanca, Maroc d Université Hassan 1er, Laboratoire Rayonnement-Matière et Instrumentation, (S3M), FST Settat, Morocco. e Materials Science and Nano-engineering, Mohammed VI Polytechnic University, Lot 660 Hay Moulay Rachid, Ben Guerir, Morocco. * Corresponding author: [email protected]

The glasses in the BaO-K2O-TiO2-P2O5 quaternary system were elaborated by conventional quenching method. The structure of the glasses was studied by density and molar volume measurements, and Raman spectroscopy. The results revealed that the BaO penetrates the glassy network as a modifier, and helps the closeness of the glassy structure. The controlled crystallization of the glasses was carried out to develop the glass-ceramics. X-ray diffraction was then used to identify the crystallized phases formed in the glass-ceramics. Dielectric and conductivity parameters of the glass-ceramics are performed by impedance spectroscopy in the temperature range of 300 to 573 K under various frequencies from 100 Hz to 1 MHz. The results obtained showed that the BaO gives, a stability behavior of εr and Tan δ as a function of frequency and temperature, and a dielectric isolation behavior to the glass-ceramics by increasing the dielectric constant and reducing the dielectric losses.

Keywords: Phosphate glasses; Glass-ceramics; Raman spectroscopy; Optical absorption; Dielectric properties. ²

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PP52 Effect of tin doping on structural, optical and electrical properties of ZnO thin films prepared by sol–gel method N. Al armouzi,1 , Hikmat. S.HILAL2, M. Mabrouki,1 aIndustrial engineering laboratory, Faculty of science and technology, Department of physics, Beni mellal, Morocco. 2SSERL, Chemistry, An-Najah National University, Nablus, Palestine + Author for correspondence: [email protected]

In this paper we have prepared ZnO:Sn by sol gel method and deposited under thin films onto glass substrate via spin coating technique. The goal of this work was to study the effect of incorporation of Sn in zinc oxide in the electrical, optical and structural properties. We have used different characterization techniques of ZnO thin films namely: UV-visible, XRD, AFM and I(V). From the results, it revealed that the electrical resistivity and the thickness of the film decrease by increasing the Sn concentration. In the optical properties we have found that in the visible range above 400 nm a high transmittance for ZnO is observed and then deceases with Sn concentration. The calculated band gap of zinc oxide thin films also decreases with increasing doping concentration (0-3%). Sn doped ZnO exhibits clearly improved surface roughness, enhanced crystallite size, reduced resistivity and consequently improved conductivity. Among all of the tin doped zinc oxides that we have prepared, the doped films with 1.5 at. % Sn concentration present the best properties. Keywords: Sol gel, Zinc oxide, Electrical resistivity 1- M. B. Agarwal, A. Sharma, M. Malaidurai, R. Thangavel.. Superlattices and Microstructures 117 (2018) 342–350 2- M. Kumar, V. Bhatt, A.C. Abhyankar, J. Kim, A. Kumar, Y. Ju-Hyung. Sensors and Actuators A: Physical 270 (2018) 118–126 3- N.H. Sheeba Sunil C. Vattappalam, J. Naduvath, P.V. Sreenivasan, S. Mathew, R. R. Philip. Chemical Physics Letters, 6351(2015), 290-294.

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PP53 Field Electron Emission from Carbon Black Nanotips: Characterization and Analysis H. A. Albraikata, M. M. Allahama, M-Ali H. Al-Akhrasb, M.S. Mousaa,+ a Department of Physics, Mu'tah University, Al-Karak 61710, Jordan. b Department of Physics, Jordan University of Science and Technology, Irbid, Jordan. + Corresponding author: [email protected]

As a cold field electron emitters, Carbon Black (CB) nanoparticles [1] will be investigated in this study under several conditions. To fabricate the emitter, tungsten blunt tips are prepared by electrochemical etching process [2]. Coating the blunt tip with a thin layer of epoxy (URP-4 resin) and Mounting the CB nanoparticles on the tungsten tip surface. The current – voltage characteristics of the samples were studied. Fowler – Nordheim and Murphy – Good plots were used to analyze the results [5, 6]. The relaxation and baking methods for samples were considered in this experiment under pressure of (10-7 mbar). Field emission microscope used to study the shape and intensity of emitted current on a fluorescent screen. More sophisticated processes may enhance the adhesion of particles and exploit the low size and high surface area of them to reach a highest emitted current subjected to the lowest applied voltage. Keywords: Carbon Black, Tungsten tip, Field emission, Field electron emission, Murphy-Good plot, Fowler- Nordheim plot. 1- Koga, T., Takenaka, M., Aizawa, K., Nakamura, M. and Hashimoto, T. Langmuir, 21(24), pp.11409-11413 (2005). 2- R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys., 19, 699 (1986). 3- M. S. Mousa, Surf. Sci. 94/95, 129 (1996). 4- M. S. Mousa., Surf. Interface Anal., 39, 102 (2007). 5- R. G. Forbes, J. H. B. Deane, A. Fischer and M. S. Mousa, Jo. J. Phys. 8, 125 (2015). (2012) 6- R.G. Forbes, Proc. R. Soc. Open Sci. 6, 190912 (2019)

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PP54 Field Electron Emission from W – Tips Coated with various Thicknesses of Polystyrene – Characteristics & Analysis M. Alabtha,+, M. Shatnawia, M. M. Allahamb, M. S. Mousab aDepartment of Physics, The University of Jordan, Amman, Jordan. b Department of Physics, Mu'tah University, Al-Karak 61710, Jordan. + Corresponding author: [email protected]

This paper studies and analyzes the characteristics of cold field electron emission from clean Tungsten tips coated with an insulating layer [1 – 3] of polystyrene [4] using various thicknesses. The process testing the samples has been done under high vacuum conditions (10-8 mbar). Clean W – tips were prepared using electrochemical etching process. The current – voltage characteristics of the samples before and after being coated were studied, analyzed using the Fowler – Nordheim [5] and Murphy – Good plots [6] and were tested using the field emission orthodoxy test [7, 8]. Scanning electron micrographs for the samples under investigation have been imaged. Additionally, the electron emission patterns, before and after the coating process, are included here, in order to compare the results being obtained which enables us to study the effect of the coating. The results obtained should improve performance that will be presented and analyzed. Keywords: Polystyrene risen, Tungsten tip, Field emission, Field electron emission, Murphy-Good plot, Fowler- Nordheim plot, Millikan-Lauritsen plot. 1- R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys., 19, 699 (1986). 2- M. S. Mousa, Surf. Sci. 94/95, 129 (1996). 3- M. S. Mousa., Surf. Interface Anal., 39, 102 (2007). 4- S. Parveen, A. Kumar, S. Husain and M. Husain, Phys. B Cond. Mat. 505 (2017). 5- R. G. Forbes, J. H. B. Deane, A. Fischer and M. S. Mousa, Jo. J. Phys. 8, 125 (2015). (2012) 6- R.G. Forbes, Proc. R. Soc. Open Sci. 6, 190912 (2019) 7- R. G. Forbes, Proc. R. Soc. Open Sci. 469, 20133027 (2013) 8- M.M. Allaham, R.G. Forbes, A. Knápek, M.S.Mousa, J. Electr. Eng. Slovak, 73 (1), 37 (2020)

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PP55 A sample method to control the growth of copper oxide nanowires for solar cells and catalytic applications L. Nkhaili+, A.Narjis , A. El kissani , A.Oueriagli , A. Outzourhit Nanomaterials for Energy and Environment Laboratory, Physics Department, Faculty of Sciences Semlalia. Cadi Ayyad University. PO Box 2390, Marrakech 40000. Morocco + Corresponding author: [email protected]

Copper oxide Nanowires (CuO NWs) are very promising for nanotechnology. CuO NWs were synthesized by thermally oxidizing copper flms at various heating rates. It has been shown that both monoclinic CuO and cubic Cu2O phases were grown on the copper surface with NW diameters of almost 100 nm for all samples Structural properties have been studied by X ray Diffraction (XRD) technique. Optical properties (especially the refractive index, absorption coefficient and optical band gap) were investigated by optical transmission measurements in the Ultraviolet-Visible-Near Infrared (UV-Vis-NIR) wavelength range. The morphological properties of the CuO NWS have been studied using scanning electron microscopy (SEM) .

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PP56 Influence of Polystyrene layer on the Performance of Field Electron Emission from Nano-Apex Carbon Fiber Emitters Saleh H. Fawaeera,+, Moneeb Shatnawia, Mohammad M. Allahamb and Marwan S. Mousab a Department of Physics, The University of Jordan, Amman, Jordan. b Department of Physics, Mu'tah University, Al-Karak 61710, Jordan.

+ Corresponding author: [email protected]

This research deals with the process of field electron emission from the surface of carbon fibers before [1 – 5] and after coating with polystyrene insulating layer [6] under high vacuum conditions. Polyacrylonitrile carbon fibers of type VPR – 19, thermally treated at 2800°C were used in this work. This investigation includes the current-voltage ( ) characteristics, Fowler – Nordheim ( ) and Murphy – Good ( ) plots [7, 8]. Scanning electron micrographs have been obtained in addition to the field electron emission patterns has been recorded. Comparison between the emission process obtained from clean and composite emitters is reported. Significant improvement on the characteristics recorded from the emitters after being coated is observed.

Keywords: field electron emission, Fowler – Nordheim plots, Murphy – Good plots, carbon fiber field emission cathode, polystyrene insulating layer, composite cathodes.

1. R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys. 19, 699 (1986). 2. M. S. Mousa, Surf. Sci. 94/95, 129 (1996). 3. M. S. Mousa, T. F. Kelly, Ultramicroscopy 95, 125 (2003). 4. V. S. Baker, A. R. Osborne, J. Williams, J. Phys. D: Appl. Phys. 7, 2105 (1974). 5. A. M. Almasri, M. J. Hagmann, M. S. Mousa, Applied Microscopy, 47 (1), 55 (2017). 6. S. Parveen, A. Kumar, S. Husain and M. Husain, Phys. B Cond. Mat. 505 (2017). 7. R. G. Forbes, J. H. Deane, A. Fischer, Jo. J. Phys. 8, 125 (2015). 8. R.G. Forbes, Proc. R. Soc. Open Sci. 6, 190912 (2019).

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PP57 Observations on the effect of coating Nano-Tip Apex with a thin layer of dielectric material on both electron and Ion Emission Mechanisms A. Al Souda, T. Bollb, A. Knápekb, M. S. Mousaa,,+ a Surface Physics and Materials Technology lab, Department of Physics, Mutah University, Al-Karak 61710, Jordan. b Institute of Applied Materials, Karlsruhe Institute of Technology, Karlsruhe 76344, Germany c Institute of Scientific Instruments of the CAS, 147, 612 64 Brno, Czech Republic + Corresponding author: [email protected]

This paper analyses the differences that occurred on field electron emission and ion emission after coating some tungsten tips with a thin layer of dielectric material. Additionally, the mechanism of emission of electrons through channels forming in the dielectric material is described. For the purposes of analysis, the emitters were prepared by coating a tungsten tip with a layer of Epoxylite® resin. A high-resolution scanning electron microscope (HRSEM) was used to scan the tip profile and measure the coating thickness. Field electron microscope (FEM) and Field ion microscope (FIM) have been used to study both: the emission-current distribution and the emission-ions distribution from the composite emitters. Two forms of emission patterns have been observed: a multi-spot pattern, from the clean emitters with irregularity in the substrate, and a bright single- spot pattern, from coated emitters with a high substrate. Key words: Field electron emission, Field ion emission, Epoxylite resin. 1 - Forbes, Richard G, (2003), Ultramicroscopy 95: 1-18. 2 - R. V. Latham and M. S. Mousa, (1986), J. Phys. D: Applied Physics 19, 4, 699. 3 - M. S. Mousa, (1987),Le Journal de Physique Colloques, Vol.486, C6-109. 4 - Knápek, A., & L. Grmela, (2013), Methods of preparation and characterisation of experimental Field- emission cathodes. Vysoké učení technické.‏. 5 - Sergeev, E., Knapek, A., Mikmekova, S., Grmela. L, & Klampar, M. (2015), Carbon. Volume 6, PP 46-68. 6 - Boll, T., Al-Kassab, T., Yuan, Y., & Liu, Z. G., (2007). Ultramicroscopy, Vol. 107, P. 796-801. 7 - Boll, T., Unocic, K. A., Pint, B. A., & Stiller, K. (2017), Microscopy and Microanalysis, Vol. 23, P. 396-403.

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PP58 Temperature Influence On The Density Of Two Dimentinnal Electron Gas in Al0.18Ga0.82N/GaN HEMT F.DJELTI1,+ , A. OULD-ABBAS1 1 Research unit of Materials and Renewable energies (URMER), University Abou Bakr Belkaïd, B.P. 119, Tlemcen, Algeria + Corresponding author: [email protected]

A promising sensing technology utilizes AlGaN/GaN high electron mobility transistors (HEMTs). HEMT structures have been developed for use in microwave power amplifiers due to their high two dimensional electron gas (2DEG) mobility and saturation velocity. The conducting 2DEG channel of AlGaN/GaN HEMTs is very close to the surface and extremely sensitive to adsorption of analytes. High- temperature effects on the electrical behavior of AlGaN/GaN HEMTs have been evaluated. dc measurements have been performed for different illumination and temperature conditions. The unpassivated devices present a good ohmic contact technology up to 550 °C in air. These high-temperature electrical measurements have also shown the existence of electrical traps. These traps are sensitive to the bias point, the illumination, and the temperature.

[1] Oussama Zeggai, Amaria Ould-Abbas, Mama Bouchaour,Phys. Status Solidi C 11, No. 2 (2014) [2] C. S. Chang and H. R. Fetterman, Solid-State Electron. 30, 485 (1987). [3] m.j. wang,b. shen,f.j. xu,y.Wang, j. xu,s. huang, z.j. yang,Appl. Phys. A 88, 715–718 (2007)

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PP59

Growth of Cu2NiSnS4 Films by a Sol-gel Spin-coating Method for Photovoltaic Application- Effect of sulfur concentration D. Ait el haja,b,+, A. El kissania, H. Chaibb,A. Oueriaglia ,A. Outzoughita aNanomaterials for Energy and Environment Laboratory, Cadi Ayyad University, PB 2390, Marrakech, Morocco. bMaterials and Energy Laboratory, Ibn Zohr University, Agadir, Morocco PB 32/S. + Corresponding author: [email protected]

In this study, the copper iron tin sulfide Cu2FeSnS4 (CFTS) thin films have been prepared by the sol-gel method without a sulfurization step. The effect of annealing time under nitrogen atmosphere on the structural, morphological, compositional, and optical properties of CFTS thin films based on earth abundant and nontoxic elements has been presented. X-ray diffraction and Raman spectroscopy analysis revealed the formation of a pure phase of the annealed thin film at 400 °C for 40 min, with majors and intense peaks without secondary phase. The crystallite size was increased, according to the increase of annealing time; it becomes 60 nm at 400 °C for 40 min. Scanning electron microscopy analysis show uniform, smooth, dense and pinhole free of the annealed thin film at 400 °C. The optical band gap decreases by annealing, it becomes 1.4 eV at 400 °C, and the absorption coefficient is higher than 104 cm-1 in visible regions, suggesting its potential use in low-cost thin film solar cells. In addition, the CFTS-based solar cell was fabricated and characterized. Keywords: Copper Fer tin sulfide; sol-gel spin-coating; structural; morphological; optical; solar cell thin film

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PP60 Optimization photoelectrochemical of the cuprous oxide (Cu2O), by electrodeposition E. Floric Rakotonarivoa, C. N. Abouloulaa, A. Narjisa, L. Nkhailia, F. Brouilletteb, A. Oueriaglia,* a Laboratoire des Matériaux de l’Energie et de l’Environnement (LaMEE, ex-LN2E), Faculté des Sciences Semlalia, Université Cadi Ayyad, BP 2390, 40000, Marrakech, Maroc b Institut d'Innovations en Écomatériaux, Écoproduits et Écoénergies, à base de biomasse (I2E3), Sciences et Génie des Matériaux Lignocellulosique, 3351 Forges Boulevar, Trois- Rivières (Québec) G8Q 4M3, Canada. + Corresponding author: [email protected]

The control of structural properties of the cuprous oxide is an available way to optimize the condition of their deposition for better performance in solar cells and electrodes for PEC hydrogen production. In this study, series of Cu2O thin films were synthesized using electrodeposition method while varying the pH of the electrolyte, the applied potential. The found results reveal that with a pH of 12 and a potential of -0.35 V lead to obtain the smallest band-gap energy with the best crystallinity.The effect of OH- ions concentration on the atomic ratio Cu:O and the energy levels in the electronic configuration of cobalt are assumed to be the underlying causes to interpret this optimization. The DRX analysis showed that all samples synthesized by applying a potential of -0.4 V and varying the pH value, varying the applied potential and setting the ph=12, all spectra exhibit the cubic structure of pure Cu2O, with a preferential peak (111), according to JCPDS:05- 0667. The UV-Vis measurements allowed us to visualize the optical properties of the film, notably the transmission spectra, and the band-gap energy Eg.

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PP61 Electrochemically Deposited Thermoelectric Binary bismuth selenide Thin films M. Khadiri1,+, M. Elyaagoubi2, R. Idouhli1, M. El Mabrouki3, A. Abouelfida1, A. Outzourhit2

(1) Laboratoire de physico chimie des materiaux et environnementFaculté des Sciences Semlalia Marrakech, Maroc, Université Cadi Ayyad, BP 2390, Maroc (2) Laboratoire de Génie Industriel Appliquée (GIAA) FST Béni-Mellal, BP 523, 23000 Maroc (2) Laboratoire de Nanomatériaux pour l’énergie et l’environnement (LNEE) Faculté des Sciences Semlalia Marrakech, Maroc, Université Cadi Ayyad, BP 2390, Maroc + Corresponding author: [email protected] Bi2Se3thin filmswere electrochemically deposited from a solution composed of BiCl3, SeO2 in 1M HCl/dimethyl sulfoxide (DMSO) (90/10 v/v)on FTO (INDIUMTIN OXIDE)as a working electrodes at 30oC. The concentrations of selenium and bismuth were equal to5.10-3M. A conventional three-electrode cell was used with for electrodeposition process.Electrodeposition was successfully carried out in a range of applied potential extending from 200 to -350 mV/SCE. The obtained films were characterized by classical and grazing incidence X-Ray diffraction as well as Raman spectroscopy. In addition, the composition and the morphology of the obtained films were investigated by scanning electron microscopy and EDX. It is found that the colours of the obtained films change with applied potential, from grey at - 200 to -250 mV/SCE to black coloursbetween -300 to -350 mV/SCE. Also, the adherence of the film decreases with increasing applied potential. Bi2Se3 form was obtained at -250 mV. This result is confirmed by grazing incidence X-ray diffraction. Raman spectroscopy showed -1 tree bands at 74, 132 and 174 cm ,which are characteristic of Bi2Se3 with excitation source of 532 cm-1 when the electrodepositing potential is -250 mV/SCE. At more negative potentials, the Raman spectra revealed that the obtained filmspresent a mixture ofbismuth selenideand bismuth oxide.

The Bi2Se3films obtained at -250 mV/SCE showed an n type conduction as revealed by the

Mott-Schottky plots performed in 0,1 Na2SO4 at room temperature under 1kHz excitation signal frequency.

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PP62

Preparation and characterization of copper oxide thin films by RF sputtering for solar selective absorbers application

Hind El Aakib1,*, N. Rochdi2, J.F. Pierson3, A. Tchenka1, A. Agdad1, A. Outzourhit1 1Solid state physics and thin films laboratory, Faculty of Science Semlalia, Cadi Ayyad University, PO Box: 2390, 40000 Marrakech, Morocco 2Research Laboratory for Materials Science, development and functionality of thin layers, 3Institute Jean Lamour, Lorraine University, Parc de Saurupt, CS 50840, 54011 cedex, NANCY, France * Corresponding author. E-mail: [email protected]

Due to its unique electrical, optical, chemical and favorable capacitive properties, cobalt oxide (CuO) thus making it a promising candidate for application, including fuel cells, supercapcitors, sensor technologies, catalysis and selective absorber for photothermal conversion. The optimization of the deposition parameters of CuO thin films remains a challenge to produce high quality films. Reactive RF-sputtering method was used to study the effect of oxygen pressure on structural, morphological and optical properties of sputtered CuO thin films in order to find the optimal parameters that improve the performance of CuO in these applications.

[1] H. El Aakib, J.F. Pierson, M. Chaik, C. Samba Vall, H. Ait Dads, A. Narjis, A. Outzourhit, ―Evolution of the structural, morphological, optical and electrical properties of reactively RF- sputtered cobalt oxide thin films with oxygen pressure,‖ Vacuum, vol. 159, pp. 346–352, Jan. 2019. [2] H. El Aakib, J. F. Pierson, M. Chaik, H. Ait Dads, C. Samba Vall, A. Narjis, and A. Outzourhit ―Nickel doped copper oxide thin films prepared by radiofrequency reactive sputtering: study of the impact of nickel content on the structural, optical and electrical properties,‖ Spectrosc. Lett., pp. 1–8, Feb. 2019. [3] H. El Aakib, M. Elyaagoubi, M. Ait Ali and A. Outzourhit, ―Influence of the Deposition Parameters on the Optical and Structural Properties of CuO Thin Films Deposited by RF Sputtering,‖ 31st Eur. Photovolt. Sol. Energy Conf. Exhib.proceedings, pp. 139–141, Nov. 2015.

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PP63tric

Dielectric relaxation in biocomposite material based on green microcrystalline cellulose reinforced vinyl resin matrix

L. Kreit1,+, A. Zyane2, I. Bouknaitir1, M. El Hasnaoui1, M. E. Achour1 , L. C. Costa3, A. Belfkira2

1LASTID Laboratory, Sciences Faculty, Ibn Tofail University, B.P. 133, 14000 Kenitra, Morocco 2Laboratoire de Chimie Bioorganique et Macromoléculaire (LCBM), Faculty of Sciences and Technics, Cadi Ayyad University, Marrakech, Morocco 3I3N and Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal + Corresponding author. E-mail: [email protected]

In this study microcrystalline cellulose (MCC) was used to improve the dielectric properties of a commercial vinylic resin (VR) by using a green method. The impedance spectroscopy technique was used to measure the dielectric parameters of the VR/MCC composite over the temperature range from 240 to 400 K and frequency range from 100 Hz to 1 MHz. Two relaxations processes were identified. The first one appears at low frequency region, and it is ascribed to a α-relaxation associated with the glass transition of the vinyl resin matrix. The second one, appearing above glass transition and low frequencies, was attributed to the interfacial polarization effect (MWS-relaxation) due to the accumulation of charges at the cellulose microcrystal/matrix interface. The relaxation parameters were evaluated from isothermal runs of the dielectric spectra by applying the Bergman model.

Keywords: Microcrystalline cellulose; Vinyl resin, Dielectric relaxations, Thermal behavior.

1. A. Elmelouky, A. Mortadi, El. Chahid, R. Elmoznine. Heliyon 4 (2018) e00536. Recherche Scientifique et Technique) for the financial support. 2. R. Bergman. Journal of Applied Physcs 88 (2000) 1356–1365.

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s in biocomPP64 Durability study of solar mirrors by an outdoor exposure in a desertic site

Sara Lakhouil1,+, Sofia Boukheir1, Abdelouahed Chbihi1, Amal Matal1, SanaeNaamane1

1Moroccan foundation for Advanced Science Innovation and Research (MAScIR)-Rue Mohamed Al Jazouli, Rabat, Morocco + Corresponding author: [email protected]

The profitability of concentrating solar power plants (CSP) is conditioned by the durability of solar reflectors because of their main function to reflect solar radiations towards receivers. But operating sites undergo different climatic aggressions like wind, sand storms and rainfall which weaken reflectors over time. So the durability study and the lifetime prediction of solar mirrors is very important.

The lifetime of solar mirrors is conditioned by several factors: • Exposure conditions: Inclination angle, Orientation after the cardinal points... ;

• Environmental conditions: Irradiation, Temperature, wind sand storms, snow...;

• Nature of mirrors: glass mirrors, polymeric mirrors, aluminum mirrors...; • Manufacturing process of coating: anti-soiling, hard coating...; • Protective back side coatings.

This work aims to study the effect of orientation and inclination on the solar reflectors durability in correlation with wind speed and direction by an outdoor exposure in a desertic site. ed on green microcrystalline cellulose reinforced vinyl resin matrix s in biocomposite

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Part C Abstracts submitted to ISyDMA’5 “Normal Edition”” Marrakech- Morocco

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ISy1 High resolution 1h nmrstudies to investigate the kinetics and the mechanism of the dissociation, ionization and the acidity of the fluoroquinolone antibiotics (ofloxacin) in body fluids and biological membranes M-Ali H. Al-Akhras (AL-Omar) a,+, Marwan S. Mousab A. Telfahc, Haya M. Alshheamata aDepartment of Physics, Bio-Medical Physics Laboratory, Jordan University of Science & Technology (JUST), P.O. Box 3030, Irbid 22110, Jordan bVice President of Mutah University, Al-Karak-Jordan cLeibniz Institute for Analytical Sciences (ISAS) in Dortmund Germany + Author for correspondence: [email protected]

The aim of the study is to know the Ofloxacin (C18H20FN3O4) antibiotic that fights bacteria in the body. The purpose of this investigation was to understand the Ofloxacin antibiotics ionization in body fluids and biological membrane, is very much relevant to the antibiotic activity and the antibiotic failures in some biological situation. Physical, chemical and bio-medical properties of the Ofloxacin-artificial-tier-solution (ATS) and Ofloxacin-water will be investigated in this intended master studies, such as dissociation constant (pKa), acidity (pH), micro-viscosity (), self-diffusion (D), hydrogen bonding network, and local molecular motion, which are essential factors for drug activity. These properties can be investigated via high-resolution 1H NMR spectral analyses, spin lattice relaxation time (T1) and self-diffusion (D) with the addition to the UV-vis and FTIR measurements. Hydrogen bond network in the aqueous Ofloxacin antibiotic solutions can be defined based on NMR chemical shift evolution with changing solution mole fraction. The hydrogen bond network structure plays significant rules in antibiotic activity due to the formed molecular structures, for example, Cage-like structure formed by hydrogen bond network can prevent antibodies molecules to get access to some sites in the body fluids and biological membranes, which might be relevant to explain the antibiotic failures in performance degradation in some biological environments. Keywords: Ofloxacin; antibiotic; dissociation constant

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ISy3

Properties of Tungsten – Polyethylene Composite Material as a Modified Source of Electron Emission N. A. Nijima,+, M. Shatnawia, M. M. Allahamb, M. S. Mousab a Department of Physics, The University of Jordan, Amman, Jordan. b Department of Physics, Mu'tah University, Al-Karak 61710, Jordan. + Author for correspondence: [email protected]; [email protected] The objective of objective of this work is to study modifications that occur to the properties of the electron emission mechanism from tungsten emitters with varioustip radii [1 – 3]. The emitters are etchedfrom pure tungsten 0.1 mm wires and have been coated by layer of variable thicknesses of polyethylene [4]. For this purpose, a number of tungsten tips with various apex radii have been prepared using electrochemicaletching techniques that has been characterized before and after coating. The measurements obtained during the experiments include the current – voltage( )characteristics, Fowler – Nordheim ( )[5] and

Murphy – Good plots ( )[6], scanning electron microscope images for the emitters apexbefore and after coatingwith the polyethylene layers.Additionally, the spacial distributions have been also recorded using from the field emission microscope. The results obtained fromthe experiments are tested using the field emission orthodoxy test [7, 8]. Keywords: Field electron emitter, polyethylene Dielectric layer, Composite emitter, Field electron microscope, Scanning electron microscope, Murphy – Good plots, Fowler – Nordheim plots.

1- R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys., 19, 699 (1986). 2- M. S. Mousa, Surf. Sci. 94/95, 129 (1996). 3- M. S. Mousa., Surf. Interface Anal., 39, 102 (2007). 4- M. Husain, G. R. Davies, I. M. Ward,Polymer,42 (8), 3679 (2001). 5- R. G. Forbes, J. H. B. Deane, A. Fischer and M. S. Mousa, Jo. J. Phys. 8, 125 (2015). 6- R.G. Forbes, Proc. R. Soc. Open Sci. 6, 190912 (2019). 7- R. G. Forbes, Proc. R. Soc. Open Sci. 469, 20133027 (2013). 8- M.M. Allaham, R.G. Forbes, M.S. Mousa M.S., Jordan J. Phys. (in press, 2020)

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ISy5 Molybdenum Oxide Thin Films Grown On Flexible Ito-Coated Pet Substrates A. Marciela,b, J. Borgesc, A. C. Bastosa, J. Suresh Kumarb, M. Peres d, K. Lorenzd,e, L. Pereira b, F. Vaz c, M. P.F. Graçab, R. F. Silvaa a CICECO - Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal b I3N, Physics Department, University of Aveiro, Campus de Santiago, Aveiro, Portugal c Centro de Física, Universidade do Minho, Portugal d IPFN, Instituto Superior Técnico (IST), Campus Tecnológico e Nuclear, Estrada Nacional 10, P-2695-066 Bobadela LRS, Portugal e Instituto de Engenharia de Sistemas de Computadores-Microsystems and Nanotechnology (INESC-MN), IST, Lisboa, Portugal + Author for correspondence: [email protected]

Thin film coatings on polymeric substrates are found in some practical technologies such as flexible electrochromic devices, flexible electronic devices, solar cells, organic LEDS, among others. Products or devices are obtained using organic or inorganic thin films grown mainly by physical or chemical vapour deposition techniques, depending on thermal sensitivity of the substrates. Despite the progress made in the past decades, new or improved thin film materials with superior performance are still being required to meet electrical, optical, mechanical and chemical stability specifications.

In the present work, molybdenum oxide (MoOx) films were deposited onto ITO-coated PET substrates by reactive DC magnetron sputtering, using a metallic Mo target in Ar+O2 plasma. The total pressure during the deposition was kept at 4x10-1 Pa and the current density applied to the molybdenum target was kept at 88 Am-2. The depositions were performed in a grounded and no heated substrate. The only parameter changed was the deposition time in order to obtain samples with different thicknesses. The as-deposited films are transparent and have an amorphous nature.

Fig. 1 Thin film of molybdenum oxide in coloured and blenched state Optical measurements showed transmissions higher than 80% in the visible range. Those films present thicknesses between 130 and 260 nm and a compact/dense and featureless morphology. XPS and RBS revealed different oxidation states and stoichiometries, respectively. Raman spectra of MoOX thin films are in accordance with XRD studies. The electrical measurements showed that dielectric constant and losses are similar for both films.

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The cyclic voltammograms showed reversibility and reproducibility in the electrochromic performances demonstrating the viability of the films for electrochromic applications.

Keywords: Molybdenum oxide (MoOx), PET, Electrochromic response

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ISy6 Energy Gap Tuning of New Materials Fabricated Through Low Intensity Laser Radiation to Polystyrene Silver Nanocomposites M. Arif BIN AGAMa,+ aFaculty of Applied Sciences and Technology, University Tun Hussein, Onn, Malaysia + Author for correspondence: [email protected]

New strategies, materials and techniques fortunable photoconductivity materials are attracting scientists concern especially in finding ways to preservethe world environment, especially in finding ways to new pollutants such as Polystyrene. Polystyrene is use in fabricating everyday materials such as for food packaging, toys and electronic and electrical appliances. Tuning photoconductivity or the energy bandgapof materials and recycling of Polystyrene, in producing tunable solar cell materials have become the theme of this presentation. Recently, doping Polystyrene and low-intensity laser irradiation enablestuning of Polystyrene/Silver Nanocomposites (PS/Ag NCs) energy bandgap, where new materials are fabricated that can be as an insulator, semiconductor and conductor materials. The tuning abilities of propose strategies to (PS/Ag NCs) and later extended to (PS/TiO2 NCs) areinvestigated through FESEM, XRD, UV-Vis, EDX, AFM, FTIR, and Raman spectroscopy. The tuning of the energy bandgap is in the range of 3.5 eV to 2.7 eV. The potential applications of this research include research in optoelectronics, microwave absorbance, and electronic device fabrication. Keywords : Polystyrene, Laser irradiation, Photoconductivity, Energy Band Gap

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ISy7 LNS – perspective material for energy application T. Petkova+, Z. Slavkova, O. Kostadinova Institute of Electrochemistry and Energy Systems Acad.E.Budevski, Bulgarian Academy of Sciences Bl.10 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria + Author for correspondence: [email protected]

The progress of the hydrogen technology is of key importance for the successful conversion to low carbon economy. The fuel cells development is supplemented with efforts towards reduction of the costs and increase of the durability of the devices. Cost could be reduced by lowering the operating temperature of the solid oxide fuel cell (SOFC), which is usually above 800⁰ C. A very good approach for development of SOFCs is using highly conductive proton materials. In this respect, lithium sodium sulphate (LNS) is a promising material. Experiments with LNS as an additive to functional layer have been reported and results reveal an increase of the conductivity. A very ordinary method of synthesis, mechanical ball milling of initial materials LiSO4, LiNO3 and Na2SO4 , has been chosen in our study. The obtained powder has been examined by X-ray diffraction in the temperature range 25 - 600oC. The LaNaSO4 undergoes phase transition from β to α phase in temperature range 500-550 C proved by the diffraction study. The DSC and combined DTA/TGA study exposes the thermal effects occurred in the material with temperature. Pellets of the LNS powder have been prepared at 240 oC and 10 atm pressure. The pellets with evaporated golden electrodes have been studied by means of electrochemical impedance spectroscopy from room temperature up to 600⁰C. The results indicate that the dc conductivity of LNS reaches 10-1 S/cm at higher temperature most likely due to both Li+ and Na+ charge carriers present in the material under study.

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ISy8

In2O3 thin filmsdoped with Asas active layer in position sensitive structures P. Petkova, V. Zhelevb, T. Petkovab aInstitute of of Electrochemistry and Energy system, Bulgarian Academy of Science, 1113 Sofia, 10 "Acad. G. Bonchev” Blvd., Bulgaria. bUniversity of Chemical Technology and Metallurgy, Department of Physics, 8 Kl. Ohridski Blvd., 1756 Sofia, Bulgaria + Author for correspondence: [email protected]

Transparent and conductive thin films of As-doped In2O3 have been deposited on glass and silicon substrates by spray pyrolysis technique, using as starting materials InCl3 and

3As2O5.5H2O. The effects of As concentration on the resistivity of the films have been investigated. The films obtained were characterized by X-ray diffraction, UV-VIS spectroscopy, scanning electron microscopy and atomic force microscopy. The application of the films in the position sensitive structures Si-SiO2-In2O3 acting on the base of lateral photo- effect has been examined.

Keywords: Thin films, Metal oxide layers, Spray pyrolysis, Position sensitive photodetector

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ISy9 Synthesis of Natural Dye Sensitized Solar Cell M. Nagarbawdia, S. Bagwanb a Department of Physics, Poona College, Camp, Pune – 411001. India. b Dept. of Physics, Abeda Inamdar Senior College, Camp, Pune-411001, India + Author for correspondence: [email protected];

Solar energy is turning out to be the most reliable energy source with its abundance and availability. Solar cells are thus assuming significance in the changing scenario. The efficiency of the solar cells is the most challenging factor in fabricating them. Attempts are made to improve the efficiency while capping costs and other environmental effects. Gratzel et al showed some promise in solar energy conversion by utilizing dye-sensitized solar cell (DSSC). Natural dye-sensitized solar cells (NDSSC), are also gaining importance for having good light harvesting pigments. In our present work, we have used curcumin and aminothymoquinone as natural dyes. Both these dyes have good phototoxicity for bacterial film which shows promise against environment degradation. Electron transfer capability of these dyes changes with different solvents. It contains trace elements and most important form of calcium which is ionic calcium. The UV spectroscopy yielded expected results which are described in the paper. Also curcumin has good anchoring with TiO2 semiconductors. The morphology surface roughness, absorption characteristics were studied. The cells‘ photovoltaic cell performance was tested with standard illumination. For curcumin short- circuit current density (Jsc), open circuit voltage(Voc), Fill factor and Effeciency are 0.187 mA/cm2 , 0.30V ,0.36, 0.0259 % and for Aminothymoquinone it is ,2.27 mA/cm2. 0.54V 0.48, 0.71% respectively. The antioxidant properties of these dyes increase the scope for them (with different solvents) to be used in NDSSC.

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ISy10 Large K thin films fabricated using PZN-PT nanoparticles structural, ferroelectric and dielectric characterization R. Ndioukanea, M. Touréa, N.C.Y. Falla, D. Kobora,+, L. Lebrunb, W. Wilhemc aLaboratoire de Chimieet de Physique des Matériaux (LCPM), Université AssaneSeck de Ziguinchor, BP 523, Ziguinchor, Senegal bUniv Lyon, INSA-Lyon, LGEF, EA682, 8 rue de la Physique, F-69621, Villeurbanne, France, cESRF, ID12,71 Avenue des Martyrs, 38000, Grenoble France + Author for correspondence: [email protected]

PZN-PT single crystals showed properties up to 10 times more interesting than those of the ferroelectric perovskite materials currently used. However, the greatest difficulty to use PZN- 4.5PT single crystals on electronic devices is to achieve them in thin layers form because of their incongruent melting property. In this work we successfully fabricatethin films by dispersing these nanoparticles in a gel. The as fabricated thin films showed colossal dielectric permittivity large than 105. However, we found from SEM images the formation of non- identified hexagonal microcrystals, which could be the origin of such excellent properties.SEM images and EDX analysis permitted to identify such components as PbNb2O6, PbPO5 and SiO2 oxydes. Dielectric permittivity temperature dependence measurements showed a ferro-ferro and ferro-para transition improvement from 124 °C and 168 °C to 178 °C and 315 °C for PZN-4.5PT bulk and nanoparticles thin film respectively what make them very interesting and facilitate their integration in electronic devices.

Figure 1: SEM image of PZN-4.5PT nanoparticles thin film showing the hexagonal microcrystals growth on the surface Keywords: nanoparticles, perovskite, ferroelectric, dielectric, diffraction Topic: Nanodielectrics, metamaterials, piezoelectric, pyroelectric and ferroelectric materials.

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ISy11

Possible Bose-Einstein Condensation of Polygonal Clusters in 2D-Materials A. Boudiara,+ aDepartment of Material Sciences, SESNV-Faculty, Tébessa University, Tébessa, Algeria + Author for correspondence: [email protected]

This study investigates the possibility of Bose-Einstein condensation (BEC) in 2D- nanoclusters. A ground state equilibrium structure involves the single phonon exchange approximation. At critical temperature, the specific heat, entropy, and free energy of the system can be determined. The results support the existence of BEC in nanoclusters, and they lead to predictions of the behaviour of 2Dmaterials at low temperatures [1]. Keywords:2D-Materials, nanoclusters, condensation. 1- A. Boudiar, Solid State Phenomena. 297, 204 (2019).

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ISy12

Assessment of optical transmission using correction of chromatic dispersion S. Kherisa, B. Bouabdallahb a Department of Electronics, Faculty of Electrical Engineering, University of Djillali Liabès, Sidi Bel Abbès, Algeria b Department of Materials and Sustainable development, Faculty of Exact Sciences, University of Djillali Liabès, Sidi Bel Abbès, Algeria. + Author for correspondence: [email protected]

One of the major factors that limit the performance of a transmision system is dispersion chromatic. Use of Dispersion Compensating Fiber (DCFs) is the most common method for dispersion compensation in transmission systems. In this paper, dispersion compensating fibers (DCFs) are used to compensate the positive dispersion accumulated over the length of the fiber of DCF. Three schemes (Pre-compensation, post-compensation and symmetrical- compensation) of dispersion compensation with DCF are proposed. The simulated transmission system has been analyzed on the basic of different parameters by using OptiSystem simulator. Are analyzed in terms of BER and Q factor. The influence of EDFA power and increase in length of each type of fiber has been studied to evaluate the performance of optical communication systems.The EDFA is the gigantic change happened in the fiber-optical communication system; the loss is no longer the major factor to limit the fiber optical transmission. Since EDFA works in 1550 nm wave band, the average Single Mode Fiber (SMF) dispersion value in that wave band is very big, about 15-20ps / (nm.km- 1)[1].The results of three dispersion compensation methods are compared in terms of two parameter, which are Q-factor, BER, The simulation Results are validated by analyzing the Q-factor .According to test ,when Q=6,the BER is about 10-10; when Q=7,the BER is about 10-12. Input power is taken as 9-10 db,The corresponding BER is better. It is observed that the symmetrical-compensation scheme performs better than pre-post –compensation [2-3].

Keywords: Dispersion compensating fiber (DCF), pre, post & symmetrical compensation, BER, Q-factor. 1- G.P.Agrawal,FiberOptic communication Systems, Wiley-Interscience, (1997). 2- Bo-ning HU, Wang Jing, Wang Wei, Rui-mei Zhao, ―Analysis on Dispersion Compensation with DCF based on Optisystem‖. 2nd International Conference on Industrial and Information Systems pp. 40-43 (2010). 3- Y. Malhotra, R.S. Kaler, ―Compensating spectral loss variations in EDFA amplifiers for different modulation formats‖, Optik 122 pp 435–439. (2011)

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ISy13 Impact of zinc substitution on the structural and ferroelectric properties of tungsten bronze ceramics A. Bendahhoua, M. Abou-Salamab, P. Marchetc, K. Chourtid, M. Loutoue,f , S. El Barkanye a,b,dLaboratory of Physical Chemistry of Natural Resources and Environment, Faculty of Sciences Oujda. cUniversity of Limoges, IRCER, UMR 7315, Limoges F-87068, France e,fDepartment of Chemistry, Faculty Multidisciplinary Nador, University Mohammed Premier Oujda

+ Author for correspondence: [email protected]

The quadratic bronzes of tungsten (TTB) of general formula[(A1)2(A2)4C4][(B1)2(B2)8]O30(Z=1)[1]; Among the large classes of ferroelectric type materials that exist, are widely used in different fields such as nonlinear optics, piezoelectric, capacitors, electromechanical transducers, infrared radiation detectors, because of their interesting properties and very varied. These materials are therefore of great technological interest[2], and have been studied extensively by several researchers and by various physico-chemical methods, for example optical, calorimetric and dielectric constant measurements as a function of different factors (temperature, frequency, chemical composition,), x-ray diffraction, electrons and neutrons.

Zinc substituted quadratic bronze ceramics of generic formula Ba5CaTi2-xZnxNb8O30(x =0,0, 0,02, 0,04, 0,06 et 0,08) have been successfully synthesized by the solid state reaction method.X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDAX) were used to examine the various structural parameters and elemental compositions. X-ray diffraction data were refinedusing the Rietveld methodusing Jana2006 software. Studies of density and porosity as a function of sintering temperature were taken into consideration in determining the appropriate sintering temperature. Impedance spectroscopy indicated that the synthesized compounds are conventional ferroelectric and the curie temperature depends on the zinc content incorporated into the structure.

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1- S. Lanfredi, D.H. Gênova, I.A. Brito, A.R. Lima, M.A. Nobre, Structural characterization and Curie temperature determination of a sodium strontium niobate ferroelectric nanostructured powder, Journal of Solid State Chemistry, 184 (2011) 990-1000. 3- H.Ohsato, Science of tungstenbronze-type like Ba6–3xR8+2x Ti18O54 (R= rare earth) microwave dielectric solid solutions, Journal of the European Ceramic Society, 21 (2001) 2703-2711. 4-

ISy14 Silicon Carbide particles dispersion Effect on the sintering behavior and damage characterization of Yttrium Oxide Composites Ceramics T. AL Omrana,+ aKarrada ,Jaderiha ,University of Baghdad ,College of Science ,Physics departmentt Baghdad, Iraq + Author for correspondence: [email protected]

Yttria, silicon carbide powders of (99.99) purity having (40-60) µm grain size were used to form different combinations of the system Y2O3- SiC. Silicon carbide particles were added in weight percent ranging (5,10,15and 20), dry milling were done for all the combinations at 12 hours. Samples of disc shape were fabricated and sintered at different sintering temperature (800,1000,1200 and 1400) ˚C, respectively under static air and for three hours as soaking time. XRD test reflect the formation of new phase which is Y5Si3C (Unique). SEM test shows the sintering behavior after the sintering proses. Sintered samples were mechanically tested by hardness and fracture strength. Improvement was noticed for all the combinations after adding the dispersed SiC particles detected especially at the combination (Y2O3 80- SiC20) Wt. %, sintered at 1400 ˚C.

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ISy15 Development of Catalyst From Waste Egg Shell For Biodiesel Production from Waste Vegetable Oil E. Victor Chinecherema, N. Raphael Ezeb,+ aDepartment of Chemical Engineering, University of Benin, Edo State Nigeria1 bDepartment of Food Technology, Akanu Ibiam Federal Polytechnic, Unwana Ebonyi State Nigeria + Author for correspondence: [email protected]

The increase in price of petroleum and environmental concerns has made the search for alternative fuels to gain importance. Biodiesel is one of several alternative fuels that is renewable and can be manufactured from vegetable oils. The main objective of the research is to produce biodiesel from waste vegetable oil using activated egg shell waste as solid catalysts. Transesterification reaction was performed for the conversion to biodiesel. Waste eggshells were calcined at 700°C, 800°C and 900°C for a time period of 3hrs for the preparation of renewable catalyst. The calcined waste eggshell catalyst was characterized using X-Ray Florescence (XRF) Spectroscopy which revealed CaO as the major constituent (90.86%), this was further confirmed by X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR) analyses. The prepared catalyst was used for transesterification reaction and the effects of calcination temperature (700 to 900°C), DES loading (3 to 18 wt. %), WES catalyst loading (6 to 14 wt. %) on the conversion to biodiesel were studied. The yield of biodiesel using waste eggshell catalyst (91%) is comparable to conventional catalyst like sodium hydroxide with a yield of 80-90%. The maximum biodiesel production yield was obtained at a specific oil-to methanol molar ratio of 1:10, a temperature of 65°C and a catalyst loading of 14g-wt%. The biodiesel produced was characterized as being composed of methyl

Tetradecanoate (C14H28O2) 30.92% using the Gas Chromatographic (GC-MS) analysis. The fuel properties of the biodiesel (Flash point 138oC) were comparable to commercial diesel and hence it can be used in compression-ignition engines. The results indicated that the catalysts derived from waste egg shell had high potential to be used as biodiesel production catalysts in transesterification of waste vegetable oil with the advantage of reusability and also not requiring water washing steps. Keywords: Egg Shell, Vegetable oil and Biodiesel 1- Amir M.D., 2010, ―Developing Biochar-Based Catalyst for Biodiesel Production‖ M.Sc., The University Of British Columbia, Vancouver. 2- Birla, A., Singh, B., Upadhyay, S.N. & Sharma, Y.C., 2012, ―Kinetics studies of synthesis of biodiesel from waste frying oil using heterogeneous catalyst derived from snail shell.‖ Bioresource Technology, 106:95-100. 3- Niju, S., Meera, K.M., Begum, S. &Anantharaman N. 2014. Modification of egg shell and its in biodiesel production. Journal of Saudi Chemical Society, 18 (5): 702-706.

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ISy16 Structural and Mössbauer studies of Sr1.5Ca1.5Fe2.25Mo0.75O9–δ and Sr1.92Ca1.08Fe2.04W0.96O9–δ double perovskites A. El Hachmia,+, B. Manouna,b, Y. Tamraouib, L. Bihc, M. Sajieddined and P. Lazore aUniv Hassan 1er, Laboratoire des Sciences des Matériaux, des Milieux et de la modélisation (LS3M), 26000 FST Settat, Morocco bMaterials Science and nano–engineering (MSN), University Mohammed VI Polytechnic, Lot 660 Hay Moulay Rachid, 43150 Ben Guerir, Morocco cDépartement Matériaux et Procédés, ENSAM Meknès, Université Moulay Ismail, Meknès, Maroc. dMaterial Physics Laboratory, Faculty of Sciences and Techniques, Sultan Moulay Sliman University, B.P. 523, 23000 Beni–Mellal, Morocco eDepartment of Earth Sciences, Uppsala University, SE–752 36, Uppsala, Sweden

+ Author for correspondence: [email protected] Materials family of A3B‘2B‘‘O9 (A = alkaline–earth metal ions with valence +2, B‘ and B‘‘ = transition metal ions with valences +3 and +6 respectively) were subjected to extensive studies, and have attracted significant interest owing to their physical properties and technological applications. The discovery of colossal magnetoresistance (CMR) in the ordered A2B‘B‘‘O6 double perovskite oxides has given rise to many recent research [1–3].

Sr1.50Ca1.50Fe2.25Mo0.75O9–δ and Sr1.92Ca1.08Fe2.04W0.96O9–δ double perovskites have been synthesized in polycrystalline form by solid–state reaction route in air, and have been studied at room temperature using the techniques of XRPD, Raman and Mössbauer spectroscopies. Rietveld refinement analysis reveals that both compounds adopt a tetragonal system with space group I4/m, with the lattice parameters a= b= 5.5176(1) Å and c= 7.8065(2) Å for

Sr1.50Ca1.50Fe2.25Mo0.75O9–δ, and a= b= 5.5453(1) Å and c= 7.8388(1) Å for

Sr1.92Ca1.08Fe2.04W0.96O9–δ. Raman spectra are consistent with group theoretical analysis predicted for tetragonal symmetry I4/m. 57Fe Mössbauer spectra recorded at room temperature show a paramagnetic behavior for Sr1.50Ca1.50Fe2.25Mo0.75O9–δ, and magnetic ordering for

Sr1.92Ca1.08Fe2.04W0.96O9–δ. The isomer shift (δ) and quadrupole splitting (Δ) values are characteristic of the high–spin Fe3+ in distorted octahedral–coordination. Keywords: Double perovskite, X–ray diffraction, Mössbauer spectroscopy, Raman spectroscopy. 1- K.I. Kobayashi, T. Kimura, H. Sawada, K. Terakura, Y. Tokura, Nature, 1998, 395, 677–680. 2- M. García–Hernández, J.L. Martínez, M.J. Martínez–Lope, M.T. Casais, J.A. Alonso, Phys. Rev. Lett., 2001, 86, 2443. 3- W.R. Branford, S.K. Clowes, Y.V. Bugoslavsky, Y. Miyoshi, L.F. Cohen, J. Appl. Phys., 2003, 94(7), 4714– 4716.

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ISy17 Electronic and photoelectronic properties of 2- (aryl) -2- (7 (4) - (arylsulfonyl) oxime-1-ethyl-1H-indazol-4-ylidene) acetonitrile molecules: DFT / TD-DFT study S. Lakrikha,+, L. Laallama, A. Jouaitia aLaboratory of Sustainable Development, Faculty of Sciences and Technologies, Sultan Moulay Slimane University, Beni Mellal, Morocco + Author for correspondence: [email protected]

In this work, we use theoretical methods DFT B3LYP/6-31G(d) density functional theory to calculate the electronic properties of the eight molecules based on of 2-(aryl)-2-(7(4)- (arylsulfonyl)oxime-1-éthyl-1H-indazol-4-ylidene)acétonitriles, for an example of these parameters: energies of HOMO , Energies of LUMO and Egap which are very interesting in the photovoltaic field. At the same time, we explore our result to achieve our goal of treminations the electronic and spectroscopic properties of these organic molecules through the use of TDDFT/B3LYP/6- 31G(d), to determine the wavelengths of the molecules and to trace the visible, ultra-violet spectrum and to determine the transition states. From our result of the electronic properties and the wavelengths of the molecules shows that these molecules could be used in photovoltaic field. Keywords: DFT, TD-DFT, Energies LUMO and Energies HOMO and Gap, UV-Vis.

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ISy18 Photopolarization processes in crystals Bi12SiO20 V. T.Avanesyana,+, A. V.Nadoyana aThe Herzen State Pedagogical University of Russia, St. Petersburg, Russia, 48, Moika Emb., 191186 + Author for correspondence: [email protected]

In this paper, we present the experimental results of studying the process of dielectric polarization of Bi12SiO20 bismuth silicate crystals under their illumination [1]. Studies were performed on optically transparent crystals grown by the low-gradient Czochralski method. An increase in dielectric constant and dielectric losses values was observed, that is, a photodielectric effect occurred. The frequency dependences of the dielectric parameters in the dark and light measurement modes, which are characterized by the dispersion of the most noticeable in the low frequency range, were experimentally obtained. In the initial region of the frequency range under study, there is a good separation of the photocapacity and dark capacitance curves (Fig. 1).

Figure 1. Frequency dependence of capacitance for the dark (1) and light (2) measurement mode. With increasing frequency, this difference decreases and is practically leveled out in the high- frequency region. In the process of photoexcitation of the investigated crystals, optical recharging of deep and shallow local states in the band gap is likely. The factors that stimulate the appearance of local centers in the structure can be, in particular, the states of lone electron pairs belonging to Bi3+ ions and defects formed by their presence [2]. The light excitation of relaxators with the content of this pair leads to a high polarization activity of the crystal structure in the low frequency range and, accordingly, the realization of quasi-dipole polarization. The observed frequency dispersion of dielectric losses when illuminating the crystals under study can be associated with photoconductivity processes on alternating current. Keywords: photodielectric effect, bismuth silicate, polarization, Czochralski method, capacity 1- V.T. Avanesyan, K.I. Payma, V.M. Stozharov. FTT, 59 (6), 1056 (2017). 2- V.T. Avanesyan, N.M. Abramov FTT, 57 (6), 1084 (2015).

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ISy19 Investigating Ofloxacin Antibiotic Ionization and Dissociation Kinetics in Body Fluid Model by Using High Resolution 1H NMR and UV-Vis Spectroscopies M. Ali AL-Akhras+, S. Marwan Mousa, Haya Al Shheamat+, InshadJum'h, A. Telfah, M. Al Wahsh, J. Lambert, R. Hergenröder

aDepartment of Physics, Bio-Medical Physics Laboratory, Jordan University of Science & Technology (JUST), P.O. Box 3030, Irbid 22110, Jordan. + Author for correspondence: [email protected]; [email protected]

Ofloxacin is a fluoroquinolones antimicrobial agent that is inhibit bacterial enzyme topoisomerases, including Deoxyribonucleic acid (DNA) gyrase. Binary solution mixtures of Ofloxacin-artificial-tears (ATs) have been prepared at different Ofloxacin concentrations in order to investigate Ofloxacin antibiotic ionization and dissociation kinetics in ATs as a model for body fluids. Physicochemical and bio-medical properties of the Ofloxacin-ATs binary has been investigated by employing the high-resolution 1H NMR spectral analysis, UV-Vis as well as viscometer and pH meter. The high resolution 1H NMR spectral analysis, self-diffusion coefficients (D), UV-Vis spectra, acidity (pH) and viscosity (η) provide essential information about the physicochemical properties and specifically the hydrogen bonding network which are essential factors for drug activity. Chemical shifts and linewidths, self-diffusion coefficients which have been investigated and plotted with incremental Ofloxacin concentrations showed the non-linearity of Ofloxacin dissociation in ATs (protic solvents). Chemical shifts and self-diffusion coefficients in the 1H in hydroxyl group shows strong deviation by adding ATs. The self-diffusion coefficients of the non-exchangeable molecules in the binary system decreases with increasing Ofloxacin concentration until 0.6 Ofloxacin mole fractions and it decreases for the above concentrations reflecting the dynamicity of the hydrogen bonding network. The self-diffusion curve behaves in a reciprocal trend of the viscosity curve indicating that both processes originating and driven by the hydrogen-bonding network. Acidity (pH) data followed the same trend of the viscosity and self-diffusion NMR reveal strong indication of the hydrogen ion (proton) concentrations with different Ofloxacin concentration is a function of hydrogen bonding network and vice versa.

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ISy20 Effect of irradiation of bacteria strains, Erythrocytes, and cell lines by the influence of Photosensitzation M. Ali H Al-Akhras (AL-Omari)a,+ aDepartment of Physics, Bio-Medical Physics Laboratory, Jordan University of Science & Technology (JUST), P.O. Box 3030, Irbid 22110, Jordan. + Author for correspondence: [email protected]

Since the beginning of humankind, extracted pigments from medicinal plants have been used to treat several diseases. Natural pigments could be an important source as a photosensitizer in photodynamic therapy (PDT). Different natural pigments as a novel drug substitute have been investigated under the influence of light. Effect of irradiation on bacterial strains, Erythrocytes, and cell lines sensitized with several dye has been investigated. This study consists of sensitizing natural dye to biological samples with and without light exposure. The light exposure is sourced with radiation power of 60 J/cm2. The results of this study showed that Gram-positive strains are more resistant to photo-inactivation than Gram-negative strains. In general, the results demonstrated that the viable counts decrease with increasing pigments concentration in the presence of light and increases in the absence of light (in dark). The behavior in the growth and mortality rates of bacterial strains are found to be structural cell wall metabolism dependent. Our finding suggests that natural pigments incorporated with light could be used as a potential drug in infection control and in controlling the decrease in the susceptibility of bacteria to antibiotic. In addition, the overall results demonstrated that natural pigments could play a major rule for the higher rate of photo-inactivation.

Keywords: Rose Bengal, photo-inactivation, photosensitization

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ISy21 High temperature X-ray diffraction study of Tantalum behaviour A. Arezkia,+ aUSTHB , Faculté de chimie, BP 32 El-Alia, Bab-Ezzouar, Alger – Algerie + Author for correspondence: [email protected]

Heated tantalum pellets progressively underwent reaction under continuous pumping or under controlled monoxide pressure in a graphite resistance high temperature X-ray diffractometer up to 2300K. A thermodynamic analysis showed that this brought into play the formation of Ta2O, Ta2O5 (low temperature modification) and Ta2C likely to be formed between 293 and 2300K, in accordance with a reaction mechanism which we found to take place in four stages.

ISy22 In -situ X-ray Diffraction Study of Alumina α-Al2O3 Behavior H. Chikh-afira,+ aUSTHB , Faculté de chimie, BP 32 El-Alia, Bab-Ezzouar, Alger – Algerie + Author for correspondence: [email protected] We determined the crystalline characteristics of the hexagonal α-alumina phase by X-ray diffraction at high temperatures between 293 and 2308K under dynamic vacuum. Our experimental values allow us to deduce an anisotropy of the ‗c‘ direction compared to the ‗a‘ direction of approximately 12% in the range of 293K - 1760K: Such an anisotropy is related to internal constraints in the alumina structure which may cause plastic deformation. There is quite a difference in the range 1760K – 2308K : no further anisotropy remains. The perfect isotropic expansion of the alumina cell leads us to conclude the absence of any internal constraint above 1760K. As the anisotropy which characterizes the alumina structure is a direct consequence of the fact that the aluminum atoms occupy two thirds of the octahedral sites in the compact hexagonal subnetwork formed by the oxygen atoms, we believe that the isotropy in question must surely translate an equal occupation for all octahedral sites so that the site contains statistically 2/3 Aluminium atom.

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ISy23 First-principles study of high-pressure phases of silver iodide S. Louhibi-Faslaa,+, H. Rekab-Djabria,b aLaboratory of Micro and Nanophysics (LaMiN), National Polytechnic School Oran, ENPO- MA, BP 1523, El M’Naouer, 31000, Oran, Algeria bFaculty of Nature and Life Sciences and Earth Sciences, Akli Mohand-Oulhadj University, 10000, Bouira, Algeria. + Author for correspondence: [email protected], [email protected] We report study of high-pressure phases of silver iodide compound, using a recent version of the full potential linear muffin-tin orbitals method (FPLMTO) which enables an accurate treatment of the interstitial regions. The Exchange-correlation has been accounted for within both the local density approximation (LDA) [1] and the generalized gradient approximation (GGA) [2]. Calculations are given for lattice parameters, bulk modulus and its first derivatives in the NaCl (B1), CsCl (B2), zinc-blende (B3), wurtzite (B4), HCP(A3), PbO

(B10), NiAs (B81) and β-Sn (A5) structures. The results of these calculations are compared with the available theoretical and experimental data. The most important result is the prediction of the possibility of two phase transitions firstly from B1 to B2 at pressure of around 55.58 GPa, and then from B2 to A3 at pressure of around 95.03 GPa, respectively. Keywords: AgI, structural properties, phase transition,DFT, FPLMTO. 1- J.P. Perdew, Y. Wang, Phys. Rev. B 46 (1992) 12947. 2- J.P. Perdew, S. Burke, M. Ernzerhof, Phys. Rev. Lett. 77 (1996) 3865.

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ISy24 Fabrication and characterization of heterojunction based on extracts of Aloe_vera plants and nanostructured Zinc oxide L. Nkhailia,+, A. El kissania, H.Ait Dadsa,b, M. Ait Alib, A. Outzourhita aLN2E Laboratory , Faculty of Sciences, Sémlalia, Cadi Ayyad University, Marrakech, Morocco bLaboratory of coordination chemistry and catalysis Faculty of Sciences Semlalia, Cadi Ayyad University PO Box: 2390, Marrakech,Morocco + Author for correspondence: [email protected]

In this work, ZnO thin films and nanowires were deposited by RF-sputtering and electrodeposition respectively. Extracts of Aloe_vera plants (EAVP) thin films were deposited by spin coating technique on ZnO seed layer and on ZnO nanowires. ITO/ZnO(buffer)/ EAVP /Al and ITO/ZnO(buffer)/ZnO nanowires/ EAVP /Al cells were completed by deposition Al circular on the film. The optical, structural and morphological properties of the as-deposited materials were measured. The current–voltage characteristics of these devices were measured in the dark and under illumination and indicatif a photovoltaic activity. The measured I-V characteristics in the dark showed a rectifing behavior and were analyzed with Shockley equation.

Keywords: hybrid solar cell, ZnO nanowire, I-V characteristics, RF sputtering

Fig: The SEM images of ZnO nanorods grown on rfsputterd (200W) ZnO seed layer

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ISy25 On the study of the effects of doping of NiO, CuO and MnO nanoparticles on photocatalytical properties of methylene blue for energy applications M. Ghamniaa,+, S. Boulilab, A. Ouhaibia,b, C. Fauquetc, V. Heresanuc , D. Tonneauc aLaboratoire des Sciences de la Matière Condensée (LSMC), Université Oran 1 Ahmed Ben Bella, 31100, Oran, Algérie bCentre CDTA, Baba Hacen, Alger cCentre CINAM-CNRS, Université d’Aix-Marseille, campus de Luminy, 13009, Marseille, France + Author for correspondence: [email protected] This work reports on the photocatalytical properties of pure and doped metal oxides as NiO, CuO and MnO nanoparticles synthesized on glass substrates heated at 400°C using a gentle and simple chemical method such spray pyrolysis. The nanofilms were prepared from different solution concentrations obtained from pure chlorate and nitrate powder salts in distilled water. The structure and the morphology of NiO, CuO and MnO nanofilms were investigated by means of X-ray diffraction (XRD) and atomic force microscopy (AFM). Exploitation of the XRD spectra has made to determine the size of the oxides nanoparticles. AFM observations revealed textured and rough surfaces. Optical transmittance measurements reveal transparent films. Determination of optical band of NiO, CuO and MnO show values in agreement with the literature and are slightly dependent on the doping. The photocatalytic degradation of methylene blue (MB) aqueous solution under UV irradiation carried out using uv-visible spectrometer shows an absorption peak around 670 nm that decreases with the increase of the UV-illumination time. Under the effect of uv-irradiation, the color of the initial MB solution was drastically attenuated. More than 80% of MB is consumed after 300 min UV irradiation for the high level doped NiO, CuO and MnO catalyst. Keywords: Spray pyrolysis method, NiO, CuO, MnO nanofilms; doping, optical properties; Photocatalytical properties

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ISy26 Phosphates Ca9-xZnxLa(PO4)7:Ln3+ as a material for luminescence in near IR Y.Y. Dikhtyara,+, D.V. Deynekoa, K.N. Boldyrevb aMoscow State University, Moscow, Russia, bInstitute of Spectroscopy of the Russian Academy of Sciences (ISAN), Troitsk, Russia +Author for correspondence: [email protected]

Ions Er3+, Ho3+in a certain matrix are promising activators as a biological label.An interesting crystalline matrix for doping with REE ions is phosphates with the structure of the mineral 3+ whitlockite.Phosphate with composition Ca9-xZnxLa(PO4)7:Ln (Ln = Ho, Er) are isostructural to the mineral whitlockite and crystallize in the polar (R3c) or centrosymmetric (R c) Fedorov‘s groups, depending on the content of cations Zn2+. These compounds are considered as promising materials for the design of materials capable of luminescing in the near infrared range, which will allow their further use for theranostic purposes. In this work, we studied the effect of Zn2+ and Sr2+ cations on the luminescence properties of whitlockite-like solid solutions doped with Er3+, Ho3+ cations. The obtained samples were characterized by the method of XRD, second-harmonic generation, and luminescence. The dielectric properties of compositions with Er3+ were studied for a more detailed determination of the spatial symmetry group — noncentrosymmetric R3c, or centrosymmetric R c, since these symmetry groups are indistinguishable in a laboratory X-ray experiment.

The presented figures show a change in the shape of the spectrum depending on the concentration of Zn2+ ions. Multiple peaks are visible for the main transitions, which is associated with the Stark structure of the ground and excited states of each of the

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luminescence centers (3 in the case of the R3c group and 2 in the case of the R c group). The monotonic redistribution of transition splitting is associated with a different influence of the crystal field, which also varies depending on the concentration of Zn2+ ions. Keywords: ISyDMA’2019, Symposium, Dielectric Materials and Applications

ISy27 Simulation of the major Risks of the nanometric TiO2 Prepared by Sol Gel Method A. Merouania,+ aResearcher/Consultant Algeria

+ Author for correspondence: [email protected] The wear of nanomateriaux is a subject which was not before approached. It is a subject very delicate, because nano sciences are at the dawn of their presence among the news scientific researches, and the humanity thus expects from resultats vouchers of these materiaux and especially in the long term. Actualy, we have as researcher in this domain, thought of determiner the maximum of risk that could cause these materials in the future, especially in their renewable application in energy and in the electronics industry. The risks that we revealed in our researches concern: Keywords: Nanomaterials, TiO2, risks, medecine, nuclear field 1- The effects of heat in damp environment, on the electronics states of nanomolecules. 2- The indesirables effects of the use of nano materiaux it curative medecine. 3- The risks energetiques in case of utiisation of a nano molecule in the nuclear industry.

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ISy28 Zn0.99V0.01O Transparent Conductive Oxide obtained using a novel green and low cost process K. Medjnoun a,b,+, K. Djessas a,b, S. Grillo a,b, R. Magnan a,b, M. Belaqziz a,b,c,L. Gaudy a,b, F. Massines a a Laboratoire Procédés, Matériaux et Energie Solaire (PROMES)-CNRS, Tecnosud, Rambla de la thermodynamique, 66100 Perpignan, France b Université de Perpignan Via Domitia (UPVD), 52 avenue Paul Alduy, 68860, Perpignan Cedex9, France cLaboratoire Procédés, Métrologie, Matériaux pour l’Energie et Environnement (LP2M2E), Université Cadi Ayyad, Faculté des Sciences et Techniques, département de physique appliquée, Marrakech, Maroc + Author for correspondence: [email protected]

The aim of this work was to elaborate a new low cost Transparent Conductive Oxide (TCO) as a window layer in photovoltaic solar cells, using a novel green process. To achieve this, thin films were deposited by Rf-magnetron sputtering using Zn0.99V0.01O nanoparticles, previously synthesized by the sol-gel method, as targets. The originality in our approach consists in making the synthesis of these nanoparticles more environmentally friendly by replacing the pollutant solvent with a new, less expensive solvent that is more respectful of the environment. In order to achieve this, an optimization of the synthesis of these nanoparticles was performed by testing different kinds of solvents.

Zn0.99V0.01O nanoparticles obtained using various solvents were sputtered on rigid and flexible substrates held at room temperature, using a sputtering power of 60 W. The structure, composition and morphology of nanoparticles and thin films have been studied using X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDX) and scanning electron microscopy (SEM). The optoelectronic properties of the thin layers were studied by spectrometry (UV-Vis-PIR) and by the four-point probe method. Our results show that

Zn0.99V0.01O nanoparticles can be successfully synthesized using a non-toxic solvent. By using them as targets, thin films have been deposited whose properties meet the criteria required for TCOs.

Keywords: TCO; Zn0.99V0.01O; nanoparticles; thin films; green process

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ISy29 Effect of doping concentration and thickness on the front layer Of InGaN solar cell A.Mammeri a,+, B.Benyoucef a a Unity of Research on Materials and Renewable Energy (URMER) AbouBakr Belkaid UniversiyB.P. 119 Tlemcen, Algéria. + Author for correspondence: [email protected]

The aim of this study is to optimisephysical parameters (current and efficiency) across P-N/

In0.65Ga0.35N solar cell through computer simulation. Geometrical parameters such as thickness and doping concentration of an In0.65Ga0.35N nanostructure on electrical parameters are investigated using SCAPS software. InGaN p-n Junction solar cells with various doping concentration and thickness of upper p- InGaN and lower n-InGaN junctions are theoretically investigated. The physical properties of InGaN p-n junction solar cells, such as the short circuit current, open circuit voltageand conversion efficiency (η) are theoretically calculated and simulated by varying the device structures and doping concentration. With this simulation study we find an efficiency η near 25%.

Additionally, we clearly demonstrate that In0.65Ga0.35 N material has the potential to realize high efficiency of solar cells.

Key words: Nanomaterials, Simulation, Solar cell, Efficiency and Energy

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ISy30 Effect of hydrothermal aging on the electrical properties of PVC insulated cables H. Ait ouazzou a, M. Nedjar a, +, A. Chaibi b, I. Ben saidj a, A. Lamali a, F. Chaouche a a Laboratoire de Génie Electrique, Université Mouloud Mammeri, Tizi-Ouzou, Algérie b Les Câbleries Electriques d’Alger, Gué de Constantine, Alger, Algérie. + Author for correspondence: [email protected]

This investigation deals with the effect of hydrothermal aging on electrical properties of polyvinyl chloride used in high voltage cables. The specimens were elaborated in introducing the base resin (PVC) and the different additives which are mainly plasticizer, filler, stabilizer and lubricant. Several circular specimens of 7.5 cm in diameter and 2 mm in thickness were put in a container filled with water. The whole was put within regulated and ventilated oven at 100°C. The aging time reached 10000 h. We studied the evolution of dielectric loss factor, permittivity, and volume resistivity in function of aging time. The curves show the presence of several peaks. The variations of dielectric loss factor and permittivity versus temperature were investigated. These curves generally point an increase of dielectric loss factor and permittivity with temperature. The curve of volume resistivity versus the inverse of absolute temperature is a straight line. The values of activation energy were determined for each aging time. The activation energy varies versus aging time. The study shows that the properties of the polymer are affected by the hydrothermal aging. At the beginning of aging the degradation is mainly due to a progressive evaporation of the plasticizer. At more advanced stages of aging, the degradation is attributed to a deterioration of the stabilizer followed by a change in color and a release of hydrochloric acid. This phenomenon results in a material crosslinking and a reduction of the volume of samples.

Key words: PVC, hydrothermal aging, electrical properties, degradation.

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ISy31 Weibull statistics in breakdown voltage of polyesterimide submitted to hydrothermal aging I. Ben Saidj a, M. Nedjar a,+, F. Belabbas b, H. Ait Ouazzou a, F. Chaouche a, A. Lamali a a Laboratoire de Génie Electrique, Université Mouloud Mammeri, Tizi-Ouzou, Algérie b Entreprise des Industries Electrotechniques, Azazga, Tizi-Ouzou, Algérie + Author for correspondence::[email protected]

The purpose of this investigation is to evaluate hydrothermal aging influence on breakdown voltage of polyesterimide used in electrical machines. Hydrothermal aging was performed on twisted pair specimens of copper wire insulated by a polyesterimide layer. The aging time attained 7500 h. The test of breakdown was executed under DC voltage. A statistical analysis of breakdown data was carried out by using the two-parameter Weibull distribution. The best linear fit was determined by an estimation based on the method of maximum likelihood. The 90% confidence intervals of Weibull plots were calculated. The study shows that breakdown voltage varies versus aging time. Its increase is allotted to a polymer crosslinking inducing a diminution of mean-free path of charge carriers leading thereby to a mobility decrease, whereas its decrease is attributed to the viscosity diminution expressing a weakening of molecular bonds and a mobility increase of charge carriers. Shape parameter change in function of aging time. Its increase is ascribed to an arrangement of the molecular structure, whereas its decrease is due to an augmentation in the size of defects. The breakdown voltage and the scale parameter depend on the polarity of applied electrical field. This finding was ascribed to the ratio difference of space charge accumulated under the two polarities. The polymer degradation is characterized by a change in color and a presence of cracks.

Keywords: Polyesterimide, hydrothermal aging, breakdown voltage, Weibull statistics

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ISy32 Development of Dielectric Materials Based on Cellulose and Thermoplastic and / or Biobased Polymers A. A. Khouaja,a B. A. Koubaa,b,+ C. H. Ben Daly c aUniversity of Quebec in Abitibi-Temiscamingue, Rouyn-Noranda, Canada bCanada Research Chair in Wood Valuation, Characterization and Processing; University of Quebec in Abitibi-Temiscamingue, Rouyn-Noranda, Canada c Director of the University Mission of Tunisia in North America, National School of Engineers of Sousse, Tunisia + Author for correspondence:[email protected]

The project explores strategies for upgrading paper fibers in new bioproducts. In fact, cellulose fibers bring multiple advantages to thermoplastic matrices in terms of mechanical, physico-chemical, thermal and dielectric properties. Our project aims to upgrade cellulose in order to develop wood-plastic composites (WPC) based on thermoplastic matrices for high added value products such as dielectric materials. These composites perform very well for some properties such as stiffness but perform less well for other properties like impact resistance and ductility. Although wood-plastic composites have advanced mechanical properties, there is a lack of information on their dielectric behavior. The bioproducts developed must have better dielectric properties and good ductility in order to be able to apply them as insulators in electrical cables. Thus, composites will be developed with three types of cellulosic fibers: kraft fibers,microcrystalline cellulose and cellulose filaments with different proportions. The matrices considered are high-density polyethylene (HDPE) and plasticized cellulose acetate (CA). For the characterization of our materials, the mechanical properties (traction, bending and impact energy), the fiber/matrix adhesion mechanisms and the fracture mechanisms of the WPC will be studied. The thermal properties (thermal stability, thermal conductivity, etc.) of fibres and composites will be determined. In addition, the rheology of CBP will be studied. The crystallinity of composites will also be measured. The dielectric properties (electrical resistivity, dielectric constant, dielectric losses, etc.) of the CBP will be measured using the dielectric spectrometer. Keywords: Cellulose fibers, biosourced matrix, CBP, dielectric properties, physico-mechanical properties

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ISy33 The mechanism study of the breakdown process of air near the flashover discharge M. Hamouda,a A. Menasriaa a Laboratoire de développement durable et d’informatique, Université Ahmed Draia, Adrar, Algeria. + Author for correspondence: [email protected] The phenomenon of flashover observed on the insulators of the airlines of the high voltage polluted is the result of a process, which proceeds in successive stages well defined. The origin of this phenomenon is related to the covering of the surface of the insulators of a layer of conducting pollution. This layer is not deposited in a uniform way, its distribution along the creepage distance present of fluctuating dimensions. The majority of the equipment of the high voltage are installed in the open air in atmospheres aggressive and polluted such as the zones tropical, Arctic, littoral. Each one of these areas is characterized by a climate and a specific pollution. For this reason, the pollution of the insulators associated with the presence with moisture decreases the level of insulation of the system. Indeed the contribution of water on the level of the deposit of pollution causes the dissolution of salts and conduit to the formation of an electrolytic layer. A leakage current, circulates then in the surface layer by causing a local draining of the electrolyte, which causes to increase the conductivity of the medium. Surface discharges appear on surface, which under favorable conditions lengthen along the insulator and connect the high voltage to the mass, this phenomenon is called flashover [1-3]. This work concerns the study of the electric vicinity of the air under the influence of certain parameters: resistivity, polarity, initial current of the discharge as well as the electric field. We made an experimental study on the rupture of the air in an interval between a discharge and an electrolytic surface of which the goal to clear up the mechanism of evolution of the discharge of skirting. The experimental results of this handling are exceptional from the point of view influences local discharge (trigger) on the effect of the polarity of the breaking stress of the principal interval [4-6]. Keywords: Discharge, Flashover, Insulator, Pollution, High voltage 1- F.Obenaus ―Die uberschlagspannung verschmutzter isolatoren‘‘ ETZ, vol.56, 1935, p.p. 369-70. 2- J.C. Labadi ―Etude de la validité du modèle électrique du contournement des isolateurs haute tension pollués‖ Thèse de spécialité. Université Paul Sabatier Toulouse. 1971 3- H.Matsuo, T. Yamashita and W.D. Shi, ―Electrical contact between a local discharge on an electrolyte solution and the solution surface, IEEE Trans. On Dielectric and Elect. Insul., Vol. 7, pp. 360-365, 2000. 4- S.Flazi, H.Hadi, K.L.Rabah, M.Hamouda, A.Boudjella ―Dynamic aspect of the direct current flashover on rectangular and new disk models‖. I.E.E.E/ CEIDP‘2001, Kitchener, On, Canada, oct.14-17,2001. 5- S. Flazi, M. Hamouda ―Influence of the electric field to the neighborhood of the discharge on its propagation to flashover‖ ELECO‘99, Turkey. 6- Slama, M. E. A., & Beroual, A. (2015). Behavior of AC High voltage polyamide insulators: Evolution of leakage current in different surface conditions. Advances in Electrical and Electronic Engineering, 13(2), 74.

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ISy35

Structural, electronic and elastic properties of WSe2 compound using ab- initio calculation H. Abbadi, S. Malki, L. El Farh LPTPME, Faculty of science, Mohammed Premier University, OUJDA, Morocco Author for correspondence: [email protected]

In this work, we have perform first-principle calculations to investigate the structural, electronic and elastic properties of WSe2 compound, using the density functional theory DFT [1] within the full-potential linearized augmented plane wave method (FP-LAPW) implemented in the code WIEN2k. The Generalized Gradient Approximation (GGA) was used to describe the exchange- correlation potential; and so to obtain the structural properties to assess the total energy of the system for different values of the primitive mesh and determining the volume at equilibrium, the compressibility modulus and the energy of the ground state. The electronic properties were obtained by calculating the band structure and the density of state DOS by using two approaches: GGA and modified Becke-Johnson (mBJ). The calculated energy bands indicate that WSe2 is an indirect band gap semiconductor and the value of gap is 0.95 eV using GGA and 1.12 eV by mBJ. This last band gap value is the closest of the experimental result of 1.2 eV [2]. The elastic constants (C11, C12, C13, C33, and C55) were determined by the IRelast package [3] integrated in WIEN2k code, they allow to deduce several physical quantities related to mechanical properties of materials in particular the Bulk modulus, the Shear modulus, the Young modulus and the Poisson‘s coefficient.

Keywords: WSe2, DFT, GGA, mBJ, IRelast, WIEN2k. 1- W.Kohn, L.J. Sham, Int. Phys. Rev. 140, A 1133. (1965). 2- T.Finteis et al .Phys. Rev. B. 55,10400. (1997) 3- M.Jamal, M.bilal, Iftikhar Ahmad,S.Jalali- Asadabadi . J.Alloy and Comp.469-579,735.(2018) 4-

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ISy36 Dielectric and energy storage properties of BaO-Na2O-Nb2O5-P2O5 glass- ceramics A. Ihyadna, A. Lahmarb, D. Mezzanea, L. Bihc,d, A. Alimoussaa, M. Amjouda, M. El Marssib aLaboratory of Condensed Matter and Nanostructures, Cadi Ayyad University, Marrakesh, Morocco b Condensed Matter Physics Laboratory, University of Picardie Jules Verne, Amiens, France cDépartement Matériaux et Procédés, ENSAM Meknès, Université Moulay Ismail, Meknès, Maroc. d Equipe Physico-Chimie la Matière Condensée (PCMC), Faculté des Sciences de Meknès, Maroc. + Author for correspondence: [email protected]

Glass–ceramic dielectrics have been considered as the most promising candidate for energy storage capacitors, because they have high dielectric constant and high breakdown strength. In this context, glass-ceramics based phosphate glasses x(2BaO-0.5Na2O)–2.5Nb2O5–1P2O5 (x=0.7, 0.8, 0.9 and 1) designated as B7, B8, B9, B10 respectively, were prepared with controllable crystallization by technology for heating processing. Subsequently, the obtained glass-ceramics were investigated by X-ray powder diffraction (XRD), Raman, impedance spectroscopy, and the P-E hysteresis loops. It was found that the dielectric properties were enhanced with the increase of x due to the crystallization of Ba2NaNb5O15 from the glass matrix. The samples exhibited a stable dielectric constant over the temperature range of 25°C to 150°C. Room temperature energy storage property was performed using P-E hysteresis loops of the glass-ceramics. The optimum discharge density was obtained for B10 with an energy efficiency of 92.5% at 50kV/cm. Keywords: Phosphate; Glass-ceramics; energy storage density; dielectric properties.

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ISy37 Effect of crystallizable glass addition on microstructures and energy storage properties of BNN ceramics A. Ihyadna, A. Lahmarb, D. Mezzanea, L. Bihc,d, A. Alimoussaa, M. Amjouda, M. El Marssib aLaboratory of Condensed Matter and Nanostructures, Cadi Ayyad University, Marrakesh, Morocco b Condensed Matter Physics Laboratory, University of Picardie Jules Verne, Amiens, France cDépartement Matériaux et Procédés, ENSAM Meknès, Université Moulay Ismail, Meknès, Maroc. d Equipe Physico-Chimie la Matière Condensée (PCMC), Faculté des Sciences de Meknès, Maroc. + Author for correspondence: [email protected] The Ba2NaNb5O15 (BNN) dielectric ceramics with different amounts of BaO-Na2O-Nb2O5-

P2O5 (BNNP) glass content were prepared via the conventional solid-state method. The effect of glass content on structural, microstructure, dielectric and energy storage properties was investigated. The XRD results showed that no secondary phase was formed after adding glass. The samples exhibited a stable dielectric constant over the temperature range of 25°C to 150°C°. It was found that the addition of BNNP glass could significantly improve the dielectric constant of ceramics. It was also found that the energy storage density of the ceramics increased gradually with increasing glass concentration. The optimum discharge density of (100-x)BNN-xBNNP (wt%, x=0, 2.5, 5, 7.5, 10) ceramics was obtained for B10 (x=10) with an energy efficiency of 78.4%. Keywords: Energy efficiency; dielectric properties; phosphate glasses.

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ISy38 Effect of intercalated anions on the electrical and dielectric properties of 2- - - NiAl-X layered double hydroxide (X=CO3 , NO3 and H2PO4 ): Investigation by impedance spectroscopy F.Z. Bouragbaa,+, W. Elhatimi a, R. Lahkale a, E.M. Moujahid a and E. Sabbar a a Faculty of Science – Chouaib Doukkali University, Chemistry Department, Laboratory of Physico -Chemistry of Materials, 24000 El Jadida –Morocco

+Author for correspondence: [email protected]

LDH are a class of (2D) anionic clays with positively charged brucite-like layers and intercalated charge balancing interlayer anions. The low cost and flexibility in LDH composition and method of preparation, and the fact that the gallery anions may be exchangeable, have attracted the interest of many investigators on the application of LDH and their nanocomposites in a variety of fields. NiAl LDH has been the most promising candidate in a variety of fields due to its properties making it favorable for different applications[1-2]. However, experimental studies interested in the investigation of electric and dielectric properties of these materials are revealed with difficulty and therefore are still scarcely discussed. The present work is focused on the study by impedance spectroscopy, of NiAl LDH intercalated with three different oxyanions.The successful intercalation was confirmed by XRD, FTIR, TGA and ICP. Using complex impedance spectroscopy measurements, equivalent circuit consisting of three serially connected R-CPE units was established for each sample which allowed the determination of their electrical parameters. The adjustment of experimental data of conductivity by the double power law allowed the determination of ζdc and other conductivity parameters and therefore the investigation of the effect of intercalated anions on NiAl LDH electrical behavior. Dielectric properties were also investigated by studying the effect of the three oxyanions on dielectric constant and tangent of dielectric loss (tanδ). Keywords: NiAl layered double hydroxide; intercalated anions; impedance spectroscopy; electrical equivalent circuit; ionic conductivity; dielectric properties.

1- Huili L, Tingting Y, Dongqin S, Zehua T, Junhao Z, Yuanjun L et al 2017 Ceram. Int.43 14395 2- Yan W, Zexiang C, Hai L, Jijun Z, Xinyu Y, Kun J et al 2016 Electrochim. Acta222 185

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ISy39 Investigation of the effect of in-situ polymerization on electrical and dielectric behavior of NiAl layered double hydroxide intercalated by vinyl benzenesulfonate F.Z. Bouragbaa,+, W. Elhatimi a, A. Assekouri a, E.M. Moujahid a, E. Sabbar a aFaculty of Science – ChouaibDoukkali University, Chemistry Department, Laboratory of Physico -Chemistry of Materials, 24000 El Jadida –Morocco

+Author for correspondence: [email protected]

In the past two decades, much research has been devoted to the inorganic-organic polymer assembly[1]. In fact LDH nanocomposites have caused great interest either in theoretical aspects or practical applications. LDHs are hostguest materials consisting of positively charged metaloxide/hydroxide sheets with intercalated anions and water molecules [2]. It has been found that the presence of polymer may drastically modify the morphology of LDH .Another approach is to take advantage of the presence of the two components and to combine their properties. In the present work, our aim is to study the effect of in-situ polymerization of vinyl benzenesulfonate on the electrical and dielectric behavior of NiAl layered double hydroxide. For this, the VBS intercalated LDH was synthesized by the conventional co-precipitation method. Then the resulting component was treated at 180 °C to obtain the polystyrene sulfonate between LDH layers. The successful intercalation of VBS and its in-situ polymerization were confirmed by XRD, FTIR, TGA and ICP. Using complex impedance spectroscopy measurements, equivalent circuit were established for each sample which allowed the determination of their electrical parameters. The adjustment of experimental data of conductivity by the double power law allowed the determination of ζdc and other conductivity parameters and therefore the investigation of the effect of in-situ polymerization on NiAl LDH electrical behavior. Dielectric properties were also investigated by studying this effect on dielectric constant and the maximum of tangent of dielectric loss (tanδ).

Keywords: NiAl layered double hydroxide; in-situ polymerization; impedance spectroscopy; electrical equivalent circuit; ionic conductivity; dielectric properties.

1- Special Issue of Chemistry of Materials: Organic-Inorganic Nanocomposite Materials 2001, Vol. 13. Ruiz- Hitzky, E. Adv. Mater. 2- You YW, Zhao HT, Vance GF. J Mater Chem 2002;907.

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ISy40 Stability analysis of blue TADF OLEDs using impedance spectroscopy A. Soo Jong Park,a B. Yooji Hwang,a C. Byeong-Kwon Ju a,+ a Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul 136- 713, Republic of Korea + Author for correspondence: [email protected]

Thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have been widely researched and developed for next generation display due to the high internal quantum efficiency (IQE). [1-2] TADF OLEDs show high IQE, but the stability of the device is generally poor compared to that of phosphorescent OLEDs. Therefore, the lifetime of blue TADF OLEDs is still poor, and there have been attempts for improving the operational stability of blue devices. In this study, impedance spectroscopy analyzes the capacitance-voltage characteristics of blue TADF OLEDs to investigate their degradation characteristics. Charge accumulation occurs in blue device; to diversify the type of devices analyzed, the hole-injection barrier of the emissive layer (EML) was controlled by varying the hole transport layer (HTL) materials. Comparisons of the peak capacitance values of reference devices with those of aged devices demonstrate that the peak capacitance drop is related to the operational stability of the devices. Because the interface between the HTL and EML affects the capacitance value, the stability of this interface in turn affects the operational stability of the devices. Consequently, operational stability of the blue TADF OLEDs can be predicted by using the impedance spectroscopy method. Keywords: organic light-emitting diodes, thermally activated delayed fluorescence, blue device, stability, impedance spectroscopy 1- H. Uoyama, K. Goushi, K. Shizu, H. Nomura, C. Adachi, Nature, 492, 234 (2012). 2- J. W. Sun, J. –H. Lee, C. –K. Moon, K. –H. Kim, H. Shin, J. –J. Kim, Adv. Mater. 26, 5684 (2014). 3- D. Zhang, M. Cai, Y. Zhang, D. Zhang, L. Duan, Mater. Horiz. 3, 145, (2016).

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ISy41 Multiferroic properties of barium and manganese co-doped bismuth ferrite ceramics M. Escobar Castillo,a,+ P. H. Yap,a V. V. Shvartman,a D. C. Lupascua a Institute for Materials Science and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Universitätsstr. 15, 45141 Essen, Germany + Author for correspondence: [email protected] Bismuth ferrite, BiFeO3, has attracted a significant attention as one of a few room temperature single phase multiferroics. However, its modulated spin structure coupled with inherent antiferromagnetic order prevents a sizeable coupling between the polarization and magnetization, namely the magnetoelectric effect in this material. Doping of bismuth ferrite on the A -or B-sites of the perovskite structure is a promising approach to vary its ferroelectric and magnetic properties and improve the magnetoelectric effect. We report on the effect of co-doping by Ba (Bi-site) and Mn (Fe-site) on the properties of BiFeO3. The ceramics were synthesized by the solid state reaction method. Their phase purity and rhombohedral crystalline symmetry have been proven by x-ray diffraction. Frequency- and temperature dependences of the dielectric permittivity were investigated. The material shows enhanced dielectric properties in comparison to undoped bismuth ferrite. PFM measurements confirm the ferroelectric nature of the materials. Magnetic properties were investigated by SQUID measurements. Keywords: Doped bismuth ferrite, dielectric permittivity, multiferroic

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ISy42 Study of anion exchange effect of chloride by dodecyl sulfate on the electrical and dielectric behavior of the Zn2Cr-Layered Double Hydroxide using complex impedance spectroscopy W. Elhatimi,a, + F. Z. Bouragba,a R. Lahkale,a A. Assekouri,a M. Siniti,b E. Sabbar,a a Laboratory of Materials’s Physical – Chemicals, Departement of Chemistry, FS-UCD El Jadida -Morocco. b Team of Thermodynamics, Catalysis and surface reactivity, Departement of Chemistry, FS- UCD El Jadida -Morocco. + Author for correspondence: [email protected] The impedance spectroscopy is an analysis technique which is widely used in many fields of research in industrial application. The method involves applying a sinusoidal disturbance of potential to the sample, and then measuring the response allows us to have the magnitude of the impedance and the phase difference of the two signals as a function of the signal frequency applied [1, 2]. 2+ The Layered Double Hydroxide (LDH) can be described by the general formula of [M 1- 3+ x+ m- 2+ 3+ m- xM x (OH)2 ] [A x/m, nH2O]. Where M is divalent metal, M is trivalent metal and A represents an anion intercalated in the interlayer space [3]. For the ability to modify the properties of (LDH) by varying the layer composition and the intercalation of other anions. In the present work, two compound precursor and hybrid have been synthesized, their structure and composition have been characterized using powder x-ray diffraction (PXRD), Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA). Also, the electric and dielectric proprieties were investigated by Modulab MTS analysis (Solartron Analytical) in a frequency range from 1Hz to 1MHz at room temperature and atmospheric humidity. This work is focused on the modeling of the experimental data of the complex impedance by an equivalent electrical circuit whose goal of determining the electrical parameters associated with each compound such as resistance, pseudo-capacitance, coefficient of dispersion and relaxation frequency. The study of the effect of the interfoliar anion (chloride and dodecyl sulfate) on the electrical and dielectric properties of Zn2Cr-LDH is focused on the analysis of the electrical conductivity at alternating current using the adjustment of these experimental data by the double power law. This adjustment makes it possible to determine the degree of interaction of the charge carriers with their environments. In addition, the analysis of the dielectric behavior was carried out through the dielectric constant and the loss tangent. The results obtained allow us to know the electrical and dielectric performance of LDH.

Keywords: Zn2Cr-layered double hydroxide; electrical equivalent circuit; ionic conductivity; complex impedance spectroscopy; dielectric loss tangent.

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1- Impedance spectroscopy –J.Ross.Mac Donald-(John Wiley&Sons) New York 1987 2- Méthode Electrochimique et mesure d‘impédance –Claude Gabrielli –CNRS-UMPC Paris. 3- Hydrotalcite-type anionic clays: Preparation, properties and applications. Journal of Catalysis Today, 11, 173–301 (1991). ISy43 Modeled the mobile robots by multi agents system for optimizing coverage area N. Benyettou1a, +, M. A.Mamieb, Faycel Khalfi b

a SIMPA Laboratory USTOMB, university Polytechnic school of Oran ENPO Algéria b RIIR Laboratory, Faculty of Exacts and Applied Sciences, University Of Oran1, Algeria

+ Author for correspondence: [email protected] The coverage of an open area with several mobile robots necessity the cooperation and coordination of several robots. We propose in this article a new model using a heuristic algorithm to optimize the coverage of several robots, while maintaining connectivity between them. The proposed algorithm is based on the multi agent system for wave propagation with robots on a regular basis. a random agent-robot initiates a position detection request for these neighboring robots to assign their next destinations. These agent-robot cooper and communicates so that each ocupped his new ideal position. This process allows to build a wave it around it by using appropriate neighbor agents. each agent-neighbor in turn launches the process to all these neighboring agents to create several new wave in parallel. The process repeats until all the mobile robots have an optimal position.

Keywords: mobile robots, multi agent system, ; Area coverage; Navigation; Optimization; Communication; Cooperation; Maintaining connectivity; Robot.

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ISy44 Technique of Elaboration by Sintering and Analysis of the WC-Co-TiC Cermet R. Harouz a, A. Lakehal b, K. Khelil c, S. Boudebane d a Mohamed Chérif Messaadia University, , Algeria., b Department of Mechanical Engineering, Mohamed Chérif Messaadia University, P.O. Box 1553 Souk-ahras, Algeria c Department of Electrical Engineering, Mohamed Chérif Messaadia University, P.O. Box 1553 Souk-ahras, Algeria d Department of Metallurgy, Badji Mokhtar Annaba University, Algeria a Author for correspondence: [email protected]; [email protected]

This article presents the findings from a study of the technique of elaboration by sintering and analysis of the WC-Co-5%TiC cermet. The techniques used successively during the development of a component can be summarized by preparation of the powder, densification and shaping, sintering and characterization of hardness and micro-hardness. The sintering operation consists in heating the part to a temperature such that the grains of powder are welded together we speak then sintering with liquid phase. The results examined the impact of TiC addition on the oxidation behavior of the WC-Co cermet, following the appearance of complex oxides (W-Ti-O) which are more stable and more adherent than WO3 oxide, volatile at medium temperature. The cermets WC-Co-5%TiC is explored by characterizing micro- structures using a SEM microscope shows clearly the different constituents and their distribution in the structure Also, the microstructure shows the formation of a mixed carbide (W, Ti) C of « core-rim » type morphology. Key words: Cermet, WC-CO- 5% TiC, resistance to oxidation, morphology core-rim 1- S. Cardinal, A . Malchère, V. Garnier, G. Fantozzi, Microstructure and mechanical properties of TiC – TiN based cermets for tools application, Int. J. Refract.Met. Hard Mater. 27 (2009) 521– 527 2- H. Zhang, J. Yan, X. Zhang, S. Tang, Properties of titanium carbonitride matrix cermets, Int. J. Refract. Met. Hard Mater. 24 (2006) 236– 239. 3- J. Russias, S. Cardinal, Y. Aguni, G. Fantozzi, K. Bienvenu, J. Fontaine, Influence of titanium nitride addition on the microstructure and mechanical properties of TiC-based cermets, Int. J. Refract. Met. Hard Mater. 23 (2005) 358– 362. 4- C. C. Onuoha, C. Jin, Z. N. Farhat, G. J. Kipouros, and K. P. Plucknett, ―The effects of TiC grain size and steel binder content on the reciprocating wear behaviour of TiC-316L stainless steel cermets,‖ Wear 350-351 (2016) 116– 129. 5- S. Abkowitz, et al., CermeTi® discontinuously reinforced Ti-matrix composites: manufacturing, properties, and applications, JOM 56 P.37–41 (2004). 6- W. C. Sun, P. Zhang, P. Li, X. L. She, Y. J. Zhang ,X. G. Chen, Effect of short carbon fibre concentration on microstructure and mechanical properties of TiCN-based cermets J.Advances in Applied Ceramics P 216- 223.(2016). 7- Z. M. Shi et al., "Tribological Behavior of Ti(C, N)-Based and Functionally Gradient Ti(C, N)-Based Cermets ", Advanced Materials Research, Vols. 97-101, pp. 1097-1103, 2010. 8- Lauri Kolloa, Jüri Pirsob and Kristjan Juhanic Effect of Sinter/HIP Technology on Properties of TiC-NiMo Cermets, - Materials Science Forum Vols. 534-536 (2007) pp 1169-1172 9- E. R. Strutt Æ E. A. Olevsky Æ M. A. Meyers Combustion synthesis/quasi-isostatic pressing of TiC–NiTi cermets: processing and mechanical response J Mater Sci (2008) 43:6513–6526

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10- Chenggang Pan, Dudu Liu, Chuanxiang Zhao, Qingming Chang and Peng He Corrosion and Thermal Fatigue Behaviors of TiC/Ni Composite Coating by Self-Propagating High-Temperature Synthesis in Molten Aluminum Alloy, Coatings, 2017, 7, 203 11- Y. Li, N. Liu, Z. Zhang, and C. Rong, ―Effect of WC content on the microstructure and mechanical properties of (Ti, W)(C, N)–Co cermets,‖ International Journal of Refractory Metals & Hard Materials 26 (2008) 33–40. 12- T. L. Stewart, and K.P. Plucknett, ―The sliding wear of TiC and Ti(C,N) cermets prepared with a stoichiometric Ni3Al binder,‖ Wear 318 (2014) 153– 167. 13- Y. Qiao,Y. Liu, Traugott E. Fisch.‖erSliding and abrasive wear resistance of thermal- sprayed WC-CO coatings‖ Journal of Thermal Spray Technology, Volume 10, pp 118–125 March 2001. 14- X. Wang, Z. Zou, M. Zhang , and S. Qu, ―Microstructure and wear properties of WC–TiC–Co/CuZnNi composite surface coating,‖ Journal of Materials Processing Technology 172 (2006) 188–194. 15- J.SAVKOVÁ, Ń.HOUDKOVÁ, M.KAŃPAROVÁ. HIGH TEMPERATURE TRIBOLOGICAL PROEPRTIES OF THE HVOF SPRAYED TIC-BASED COATINGS. METAL, Brno, Czech Republic, EU 23- 25. 5. 2012 16- D. Duman, H. Gökçe, and H. Çimenoğlu, ―Synthesis, microstructure, and mechanical properties of WC– TiC–Co ceramic composites,‖ Journal of the European Ceramic Society, 32 (2012) 1427-1433. 17- Y. Li, N. Liua, X. Zhang, and C. Rong, ―Effect of WC content on the microstructure and mechanical properties of (Ti, W)(C, N)–Co cermets,‖ International Journal of Refractory Metals & Hard Materials 26 (2008) 33–40. 18- OP Modi, BK Prasad, AK Jha, VP Deshmukh, AK Shah,‖ Effects of material composition and microstructural features on dry sliding wear behaviour of Fe–TiC composite and a cobalt-based stellite ― Tribology Letters, V 17, pp 129–138 2004. 19- Tõnu ROOSAAR, Jakob KÜBARSEPP, Heinrich KLAASEN, Mart VILJUS, Wear Performance of TiC- Base Cermets MATERIALS SCIENCE (MEDŅIAGOTYRA). Vol. 14, No. 3. 2008. 20- S. Lemboub, S. Boudebane, F.J. Gotor, S. Haouli, S. Mezrag & all, ―Core-rim structure formation in TiC-Ni based cermets fabricated by a combined thermal explosion/hot-pressing process‖, Int. J. of Refractory Metals & Hard Materials 70 (2018) 84–92.

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ISy45 Mixed oxide derived from Layered Double Hydroxide: Synthesis, characterization and analysis by impedance spectroscopy of solids R. Lahkalea, +, W. Elhatimia, F.Z. Bouragba a, A. Assekouri a, E. Sabbar a a Laboratory of Material's Physical- Chemicals. Department of Chemistry, Faculty of Sciences, Chouaib Doukkali Univrsity, El Jadida, Morocco. + Author for correspondence: [email protected] Layered Double Hydroxides (LDH), also called anionic clays, are lamellar compounds described by the general formula: , where x is equal to molar ratio of M3+/(M2++M3+), M2+ and M3+ are divalent and trivalent metal cations, respectively, At- is the counter ion with t valence and m is the hydration degree of LDH [1]. The calcination of these materials at moderate temperatures conducts to derived mixed oxides with formula: .

In this work, the impedance spectroscopy of solids was used to investigate the electrical and dielectric behaviors of a mixed oxide derived from a synthesized and characterized LDH. The electrical modeling allows establishing the equivalent circuit and the frequency dependence of conductivity, dielectric constant and dielectric loss tangent were also reported and discussed. Keywords: Mixed oxides, Layered Double Hydroxides, Impedance spectroscopy of solids. 1- A. Vaccari, Appl. Clay Sci. 14, 161, (1999).

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ISy46 Impedance spectroscopy, electrical relaxation and Ac conductivity studies of an organic-inorganic hybrid compound: C12H14N2CuCl4 M. Belhouchet, W. Wamani Laboratoire Physico-Chimie de l’Etat Solide, Département de Chimie, Faculté des Sciences de Sfax, B. P. 1171, 3000 Sfax, Tunisia. Corresponding autor: [email protected]

The Ac conductivity of the C12H14N2CuCl4 compound has been reported in the temperature and frequency range from 373 to 423 K and 209 Hz – 5 MHz, respectively. Differential Scanning Calorimetry and Thermogravimetric analysis indicate the presence of a phase transition at 400 K. The Z‘ and Z‘‘ versus frequency plots are well fitted by using equivalent circuit model. The circuits consist of the parallel combination of bulk resistance Rp and constant phase element CPE. Analysis of the experimental data based on the jump relaxation model, showed that the translation motion of the charge carrier and reorientation hopping between equivalent sites of the metal chloride anion and the cations groups are responsible for the observed Ac conductivity in the temperature regions I (373–400 K) and II (400–423 K). The frequency dependence of the conductivity is interpreted in terms of Jonscher's law: σ (ω) n = σdc +A ω . The conductivity follows the Arrhenius relation. Keywords: Organic–inorganic hybrid, Thermal behavior, Electrical impedance spectroscopy, Equivalent circuit, AC conductivity.

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ISy47 Effects of annealing temperature magnetic properties of electrodeposited CoFe2O4 nanowires N. Labchir,a,b,+ A. Hannour,b H. Mouhib,b A. A. Hssi,b D. Vincent,a K. Abouabassi,b A. Ihlal,b M. Sajieddinec aUniv Lyon, UJM-Saint-Etienne, CNRS, Institut d’Optique Graduate School, Laboratoire Hubert Curien UMR 5516, F-42023, Saint-Etienne, France bMaterials and Renewable Energies Laboratory, Faculty of Science, Ibn Zohr University, Agadir, Morocco cMaterials Physics Laboratory, University of Sultan Moulay Slimane, 23000, Béni Mellal, Morocco + Author for correspondence: [email protected]

This work demonstrates the synthesis of CoFe2O4 onto alumina nanoprous membrane at room temperature via electrodeposition technique which was conducted in a solution containing iron and cobalt species [1]. The duration and the temperature of annealing were ranging from 24, 500 oC to 30, 700 oC in order to investigate their effect on the physico-chemical properties of CoFe2O4 nanowires. The characteristics of electrodeposited CoFe2O4 nanowires were investigated via x-ray diffractometer (XRD), scanning electron microscopy (SEM), and Vibrating sample magnetometer (VSM). The XRD results showed the intensity peak of o CoFe2O4 corresponded to reflection (311) increased when the duration of annealing at 500 C increased to 30 hours. Based on Sherrer's formula calculations, a decreasing of the grain size, from 35 to 26 when the temperature shifted from 500 oC to 700 oC, was reported. The SEM investigations confirm a total filling pores by CoFe2O4 and have an average diameter of 100 nm. VSM characterization revealed an improvement in the Squareness ratio M/Ms and the coercitive field Hc of the nanowires as the time of annealing increased from 20 to 30 hours for both annealing temperature. From this study, the significant effect of annealing temperature on the elaborated nanowires properties was clearly observed and plays an important role to control their magnetic response [2-3].

Keywords: Electrodeposition, CoFe2O4 nanowires, Annealing Temperature 1- O. Aaboubi, K. Msellak, Appl. Surf. Sci. 396, 375 (2017). 2- H. Matsushima, T. Nohira, Y. Ito, Electrochim. Acta. 49, 4181– 4187 (2004). 3- A. Franczak, A. Lavesque, F. Bohr, J. Douglade, J.P. Chopart, Appl. Surf. Sci. 258, 8683 (2012).

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ISy48 Simulation and optimization of perovskite-based solar cell with inorganic hole transporting layer H. Mouhib,a,+ N. Labchir,a K. Bouabida aMaterials and Renewable Energies Laboratory ,Faculty of Science, Ibn Zohr University, Agadir, Morocco. + Author for correspondence: [email protected] This report presents the simulation and optimization of perovskite-based solar cells with inorganic hole transporting layer, several structures have been found in the literature to improve the conversion efficiency of this material. The aim of this report is to improve the performance of the solar cell based on perovskite solar cell. The simulated solar cell is made by the FTO / ZnO / DL1 / / DL2 / stack where ZnO is the electron transport layer (ETL), is the hole transport layer (HTL), is the absorbent layer. However, the absorber thickness, defect density in absorber as well as the defect density at the interfaces and physics parameters of HTL has been modified in order to have better conversion efficiency. The results have shown that a lower defect density in absorber is required to have a good efficiency, the higher defect density at the two interfaces cause more traps and deteriorate the performance of cells, the use film is beneficial for device performance, finally the optimization of the thickness is paramount for IV characteristics while respecting the rang of thickness achieved in the industry. The numerical simulation was carried out by the software SCAPS-1D. Keywords: Perovskite-Based Solar, Hole Transporting Layers, SCAPS, Device Modeling 1- H. Feng et al, Nature Photonics, 8, 489 (2014). 2- A. Niemegeers and M. Burgelman, Proc. 25nd IEEE Photovoltaic Specialists Conference, Washington D.C, 901-904 (1996). 4- A. A. HSSI et al. Materials Today: Proceedings, (2019).

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ISy49 Phase composition and piezoelectric properties of (1-x)PZT–xBFN ceramics with the variation of BFN F. Kahoul,a,b,+ L. Hamzioui,a,b A. Guemache,a M. Aillerie,c,d A. Boutarfaiab a Université de M’Sila, Département Socle Commun ST, Faculté de Technologie, M’Sila 28000 Algérie b Université de Biskra, Département de Chimie, Laboratoire de Chimie Appliquée, B. P. 145, RB-Biskra 07000 Algérie c Université de Lorraine, LMOPS, EA 4423, 57070 Metz, France d Centrale Supelec, LMOPS, 57070 Metz, France + Author for correspondence: [email protected] The (1-x) Pb (Zr0.50 Ti0.50)O3–x Bi (Fe1/3 Nb2/3)O3 (abbreviated as (1-x)PZT–xBFN , where x = 0.01, 0.02, 0.03 and 0.04) ceramics were synthesized by a solid state reaction method. The phase structure, microstructure dielectric and piezoelectric properties were systematically investigated. The analyses of X-ray diffraction and Raman dates show the tetragonal phase structure is obtained in all ceramics at room temperature. The optimum electrical properties of

(1-x)PZT–xBFN such as piezoelectric constant d31 = 215 pC/N, mechanical quality factor Qm

= 705, dielectric constant ɛr = 1155, dielectric loss tan δ = 0.018, bulk density 3 ρ = 7.90 g/cm and electromechanical coupling factor kp = 0.64 were obtained at x = 0.02.

Keywords: Tetragonal, Density (ρ), Piezoelectric constant (d31), Mechanical quality factor (Qm), Electromechanical coupling factor (kp)

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ISy50 The study of a synthesized inhibitor P1 on the corrosion of mild steel in H2SO4 acid medium (0,5 M) N.Setti a, A.Dafali a, K.Cherrak a, N.K.Sebbar b,E.M.Essassi b aLaboratory of Applied Analytical Chemistry, Materials and Environment (L2ACME), Faculty of Science, B.P. 717, 60000 Oujda, Morocco bLaboratory of Heterocyclic Organic Chemistry, (URAC-21), Faculty of Sciences, University of Mohammed V, B.P. 1014, Rabat, Morocco + Author for correspondence: [email protected]

So as to study the new molecules‘ inhibition {4-nonadecyl-2H-benzo[b] [1,4]thiazin-3(4H)- one} (P1) in corrosion inhibitors of the mild steel in H2SO4 acid medium (0,5 M) through gravimetric and electrochemical methods (stationary and transient).The concentration effect was investigated in two different mediums which are : HCl (1M) and H2SO4 (0,5M). Moreover, thermodynamic parameters were calculated using the variation of temperature in weight loss measurements. The inhibition efficiency increaseswith the concentration of the inhibitor to reach 90.6% at 10-3M. The polarization measurement also showed that this inhibitor acts essentially as a mixed one. EIS measurements have revealed that the charge transfer resistance increased with increase in inhibitor concentration.P1 was adsorbed on the surface of the steel according to the Langmuir adsorption model which was by chemisorption.

The efficiency of P1 inhibitor in HCl (1M) medium was higher than IE% obtained in H2SO4 (0,5M) medium.

Keywords: Corrosion inhibition, sulfuric acid, mild steel, polarisation and electrochemical measurements

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ISy51 Tailoring of stable induced domains near a charged domain wall in lithium niobate by probe microscopy I. V. Kubasov+, A. M. Kislyuk, T. S. Ilina, A. V. Turutin, D. A. Kiselev, A. A. Temirov, M. D. Malinkovich, Yu. N. Parkhomenko National University of Science and Technology MISiS, 119049, Moscow, Leninskiy prospekt 4 + Author for correspondence: [email protected] The influence of a charged domain wall on the formation of the induced domain structures in congruent x-cut lithium niobate crystals (LiNbO3, LN) was studied. By diffusion annealing in air ambient near Curie temperature, as well as infrared annealing in oxygen-free ambient bi- and multidomain ferroelectric structures containing charged domain walls ―head-to-head‖ and ―tail-to-tail‖ were formed. By Kelvin probe mode of atomic force microscopy (AFM) surface potential near the charged domain walls was investigated. We studied surface needle-shaped induced microdomains which were formed in a vicinity of the domain boundary and far from it by applying of voltage to the cantilever being in a contact with the surface of the sample. Dependence of morphology of the induced domain structure on the crystal‘s electric conductivity was demonstrated. Screening effect of charged ―head-to-head‖ domain wall on a shape and size of the domain, that was induced near the boundary was shown. We described partition of the single needle-shaped domains formed by AFM cantilever to several microdomains having a shape of several beams based in a common nucleation point. We found an influence of the charged domain wall on the topography of the samples, which consisted in the appearance of a long groove corresponding to the domain boundary after the reducing annealing. Keywords: Lithium niobate, bidomain crystal, charged domain wall, diffusion annealing, piezoresponse force microscopy, surface potential

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ISy52 Silicon-Carbon Films Synthesis by High-Frequency Deposition A. Temirova,+, I. Kubasova, R. Zhukova, D. Kiseleva, M. Malinkovicha, Y. Parkhomenkoa a National University of Science and Technology “MISiS”, 119049, Moscow, Leninskiy prospekt 4

+ Author for correspondence: [email protected]

Silicon-carbon diamond-like thin films are a promising class of amorphous materials. Due to its unique physical properties – high hardness, low coefficient of friction, high chemical resistance and radiation resistance, they find an application in various fields of industry, mainly as protective coatings. There are many methods of synthesis of diamond-like films. However, currently the development of new technologies is an important task. This work presents a method of silicon-carbon films production by high-frequency deposition from the vapor mixture. This method is based on the diamond-like films synthesizing technology described by Parkhomenko et al.1 Here we managed to resolve the main drawback of this technology - the uncontrollable amount of background impurities in the resulting films. The specimens described in this work were investigated by atomic force microscopy and ESCA. The absence of background impurities in the samples, and the presence of the ratio of sp2 and sp3 links, typical for silicon-carbon films. The method of receiving allows creating doped silicon-carbon films with well-defined physical properties, primarily conductivity, eliminating the influence of background impurities. The work was carried out with financial support from the Ministry of Education and Science of the Russian Federation in the framework of increase Competitiveness Program of NUST ‗‗MISIS‖, implemented by a governmental decree dated 16th of March 2013, No 211 (no. В100-Н1-П22).

Keywords: Silicon-carbon film, High Frequency Deposition, Protective coating, Diamond-like film. 1- Yu. Parkhomenko, M. Malinkovich, E. Scryleva, M. Shupegin, (2005) Izvestia vuzov, 3, 12-16. (In Russian) Тезисы: Кремний-углеродные алмазоподобные тонкие пленки являются перспективным классом аморфных материалов. Благодаря своим уникальным физическим свойствам - высокой твердости, низкому коэффициенту трения, высокой химической стойкости и радиационной стойкости, они находят применение в различных областях промышленности, главным образом в качестве защитных покрытий. Существует много методов синтеза алмазоподобных пленок. Однако и в настоящее время разработка новых технологий является важной задачей. В данной работе представлен способ получения пленок кремний-углеродных пленок высокочастотным осаждением из паровой смеси. Этот метод основан на технологии

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синтеза алмазоподобных пленок, описанной Пархоменко и ост. 1. Здесь нам удалось решить главный недостаток этой технологии - неконтролируемое количество фоновых примесей в полученных пленках. Образцы, описанные в этой работе, исследовались методом атомно-силовой микроскопии и ЭСХА. Показано отсутствие фоновых примесей в образцах и наличие отношения sp2 и sp3 звеньев, характерного для пленок кремний-углерод. Способ получения позволяет создавать легированные кремний-углеродные пленки с четко определенными физическими свойствами, в первую очередь проводимостью. Исследование финансировалось Национальным университетом науки и технологий «MISiS» (K2-009-2017). Ключевые слова: кремний-углеродная пленка, высокочастотное осаждение, защитное покрытие, алмазоподобная пленка. ISy53 Magnetoelectric Effect in the Bidomain Lithium Niobate/Nickel/Metglas Gradient Structure A. Turutin, a,b, + I. Kubasov, a A. Kislyuk, a N. Sobolev, a,b O. Sokolov,c M. Bichurinc a National University of Science and Technology MISiS 119049 Moscow, Russia b Department of Physics and I3N University of Aveiro 3810-193 Aveiro, Portugal c Institute of Electronic and Information Systems Novgorod State University 173003 Veliky Novgorod, Russia + Author for correspondence: [email protected] The work describes the magnetoelectric (ME) effect in a gradient laminate structure consisting of a LiNbO3 (LN)/ Ni/ metglas multilayer based on a bidomain lithium niobate single crystal with a y+128°-cut. The main purpose of the work is to obtain a self-biased structure. A theoretical and experimental study is conducted to determine the optimal thickness of the Ni film for creating such a structure. We observed a reduction of bias magnetic field for the bidomain LN/Ni/metglas laminate structure down to 3.5 Oe in comparison with the ME composite without Ni layer (4.9 Oe). The maximum value of ME effect under bending resonance conditions was 577 V/cm·Oe in an optimal bias field of 3.5 Oe for the structure with a 860-nm-thick Ni film. Experimental results were in full agreement with the calculations made on the basis of magnetic circuit considerations, taking into account the magnetization curves of Ni and metglas. The gradient ME composite might be useful in a ME current sensor, due to a shift of the linear portion of αE to the zero-bias field. The use of self-biased structures based on gradient bidomain LN in practical applications will significantly reduce power consumption, weight, and size and increase the sensitivity of ME devices. Keywords: bidomain crystals, gradient structures, lithium niobate, magnetoelectric effect

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ISy54 Study of Fluorine doping physical properties of sprayed ZnO thin films. S. Boulmelh,a L.Saci,a aLEMEAMED laboratory, Department of Electronics, University des frères Mentouri, 25000 Constantine, Algeria. + Author for correspondence: [email protected] This work deals with an analytical study of some physical properties of undoped and Fluorine doped zinc oxide thin films (ZnO:F). The films were deposited by fully automated spray pyrolysis deposition technique (HOLMARC HO-TH-O4) on the microscope glass under selected conditions. The starting solution is a mixture of an equivalent mass of 0.1 mol of zinc acetate-dihydrate [Zn (CH3COO)2, 2H2O ] and previously specified quantity of ammonium fluoride (NH4F), the latter is dissolved in a mixture of deionized water and ethanol with a ratio of 4 : 2 respectively. In order to to know the effect of the F concentration on the various physical properties of zinc oxide, the obtained films were subjected to study with various techniques such as structural, composition and optical characterization. The XRD spectra of all samples shows the appearance of different diffraction peaks at angles 2θ = 31.86°, 34.45°, 36.30°, 48°, 56.86°, 63°, 66.53°,68.10° and 69.24° correspond to zinc oxide phase. This implies that the films are polycrystalline, having hexagonal wurtzite structure (using JCPDS 36{1451) [1]. Raman spectroscopy was also used to study the chemical composition; its low high results showed the presence of the E2 , E2 phonon modes attributed to wurtzite phase of ZnO [2]. On the other hand, the optical study enabled us to measure the transmittance, the latter was used to extract the thickness, band gap, Urbach energy, refractive index n(λ) and extinction coefficient k(λ). Finally, the optical constants such as dielectric constant and dissipation factor were extracted from a study of dielectric function, While that the single oscillator energy (E0) and dispersion energy (Ed) were extracted using the Wemple and DiDomenico model [3]. This study showed that the deposited films can be used in to optoelectronic devices. Keywords: Spray pyrolysis, Thin films, Doped ZnO, XRD, Raman, Dielectric. 1- N. Fujimura, T. Nishihara, S. Goto, J. Xu, T. Ito, Journal of Crystal Growth 130, 269 (1993). 2- T. Tharsika, A. S. M. A. Haseeb, and M. F. M. Sabri, Thin Solid Films, 588, 283, (2014). 3- S. H. Wemple, M. DiDomenico, Phys Rev B, vol. 3, pp. 1338-1351, (1971).

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ISy55 Magnetoelectric Properties of Laminates Based on Y+140°-cut Bidomain Lithium Niobate Crystals A. Kislyuk,a+ A. Turutin,a,b J. Vidal,c I. Kubasov,a M. Malinkovich,a Y. Parkhomenko,a S. Kobeleva,a A. Kholkin,c,d N. Sobolev,a,b a National University of Science and Technology MISiS, Moscow, 119049, Leninsky av. 4, Russia b Department of Physics and I3N, University of Aveiro, 3810-193 Aveiro, Portugal c Department of Physics and CICECO – Aveiro Institute of Materials, University of Aveiro, 3810-193 Aveiro, Portugal d ITMO University, St. Petersburg 197101, Russia + Author for correspondence: [email protected]

Bidomain lithium niobate crystals are a promising material for precise actuators and magnetic sensors based on composite multiferroic structures. Previously it was shown that a magnetoelectric (ME) coefficient of at least 578 V/(cm·Oe) can be obtained under resonance conditions in a laminate composite ―bidomain crystal – metglas‖.A series of bidomain samples was prepared by annealing upon out-diffusion of Li2O from LiNbO3 with a resultant growth of an inversion domain. The best sample for further studies was selected by testing the crystals as cantilevered piezoelectric actuators and measuring the deflection at the voltage of ±500 V. The movement amplitude of the free end of the chosen specimen was only 13% smaller than the theoretically predicted value for an ideal bimorph. This confirmed a high quality of the domain structure. Measurements of the direct ME effect were carried out at room temperature and at a frequency of 110 Hz in the quasi-static regime with an applied modulation magnetic field δH = 0.1 Oe. The maximum measured quasi-static ME coefficient was as large as |αE31| = 1.9 V/(cm·Oe). The dynamic ME coefficient was measured as a function of the modulation frequency with an applied optimum bias field of 5 Oe corresponding to the maximum ME effect as measured in the quasi-static regime. We found giant bending resonant ME coefficients of up to 1704 V/(cm·Oe) at a resonance frequency of 6862 Hz. The ME composite exhibits a giant conversion value of 69.9 V/Oe, and in this case the measured magnetic noise density is only 92 fT/Hz1/2, which is quite respectable for this resonance frequency. We observed a good correspondence between the experimental results and the ones calculated in the framework of the unidimensional model.

Keywords: Magnetic sensors, lithium niobate, bidomain crystals, magnetoelectric effect, cantilever, low frequency

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ISy56 Phase transitions and conduction mechanisms of the organic inorganic hybrid: [NH3 (CH2)8 NH3]Cl2 M.F. Mostafa, A. K. Tammam, D. Gawad Physics department, Faculty of Science, Cairo University, Giza, Egypt + Author for correspondence:[email protected]

The new long chain hybrid [NH3 (CH2)8 NH3]Cl2 shows the following phase transitions which are identified by differential scanning calorimetry (DSC) in the temperature range 170 K- 420 K and confirmed by electrical impedance. (VIII) T6=206 (VII) T5=268 (VI) T4=(274) (PhaseV) T4=(315) (PhaseIV)T3=328 (PhaseIII) T2=393 (PhaseII)T1=402(PhaseI)

Room temperature X-ray powder diffraction indicated a monoclinic P21/c with crystallographic parameters a= 18.179 Å, b= 15.380 Å, c= 4.881 Å and = 109.54(0), V= 1286 (Å)3 , Z=4. The frequency dependent AC conductivity at different temperatures is interpreted in terms of s1 the jump relaxation model and are well fitted to super-linear power law ζtot= ζdc + A1 + s2 A2 . Temperature and frequency dependence of ac- electrical conductivity indicated that, conduction mechanism takes place by quantum mechanical tunneling at low temperature while non-overlapping small polaron is the conduction mechanism in the intermediate temperature range. Correlated barrier hopping (CBH) prevail at high temperatures. Activation energy and its frequency dependence were calculated for the different phases. Minimum hopping distances in the different phases were evaluated from ac-conductivity results.

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ISy57 Synergistic effect of Grated Agave Americana and potassium iodate on AISI 410 corrosion in 0.5N H2SO4 S. Abderrahmane a, R. Boulmerka a Laboratoire d’Ingénierie des Surfaces (L.I.S)- Badji Mokhtar- AnnabaUniversity B.P 12-23000 Annaba Algeria + Author for correspondence: [email protected]

In the dental office, surgical instruments must be sterilized for each patient, after their contamination by saliva and blood. Sterilization repeated cycles cause corrosion. A worn and corroded instrument may cause toxicity to the patient. Our study aim is to improve the corrosion resistance of orthodontic pliers during sterilization using green inhibitors. The behavior of AISI 410 stainless steel with respect to corrosion was studied in 0.5M H2SO4, using synergistic effect of Grated Agave Americana (G.A.A) and potassium iodate (KI) as green inhibitor.The study was conducted by the weight loss method (W.L), stationary electrochemical techniques (polarization curves (PPD)), transients (EIS),the method of zero charge potential (PZC) and microscopic observations by SEM-EDX and AFM.The maximum inhibitor efficacy is 89%at 10% (v/v) of G.A.A alone obtained after 2hours immersion time at 25°C. The addition of potassium iodide (KI) improves the inhibitor efficacy (98%).SEM- EDX and AFM micrographs confirm the obtained results.

Keywords :AISI 410, Corrosion, green Inhibitor ; Synergistic effect, Agave Americana, KI.

1-Oulabbas, A. and Abderrahmane, S. Materials Research Express, 6(1), p.015513, 2018.. 2-Krid, F., Zouaoui, E. and Medjram, M.S. Chemistry & Chemical Technology, 12(3), pp.405-409, 2018. 3-Sameh, ATHMANI, Sihem, ABDERRAHMANE, Fadila, BENACHOUR and Gülfeza, KARDAS. MaterialsResearch Express, 6(1), p.016504,2018. 4-Amensour, M., Application bio-technologique à l‘amélioration de la qualité des produits alimentaires.2010. 5-Bajwa, R., Mukhtar, I. and Mushtaq, S. Canadian Journal of Plant Pathology, 32(4), pp.490-492,2010.

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ISy58 Synergistic effect of grated OpuntiaFicus Indica and potassium iodide on AISI 410 steel corrosionin 0.5N H2SO4 R. Boulmerka*, S. Abderrahmane Laboratory of Surface Engeneering (LIS) ; Badji Mokhtar–Annaba University B.P.12 El Hadjar Annaba ALGERIA. + Author for correspondence: rayhaneboulmerka @email.com

The objective of our study aims to improve the orthodontic pliers resistance to corrosion in

0.5M H2SO4. Among the fighting methods against corrosion, we used green inhibitors, and their synergies with additives. The synergistic effect of grated OpuntiaFicus Indica (OFI) and potassium iodide (KI) on AISI 410 steel corrosion in 0.5N H2SO4,was studied using stationary techniques (polarization curves), transient techniques (EIS), and the zero charge potential method (PZC). The best inhibitory efficacies were obtained at 25°C, for O.F.I alone (90%) at 15% (v / v) after 2 hours immersion and in synergy with KI (93%). The microscopic characterizations by SEM-EDX and AFM confirm well the results obtained by different used methods. Keywords: AISI 410, Corrosion, Green inhibitor, Synergy, OpuntiaFicus Indica, KI. 1-Oulabbas, A. and Abderrahmane, S. Materials Research Express, 6(1), p.015513;2018. 2-Krid, F., Zouaoui, E. and Medjram, M. Chemistry & Chemical Technology, 12(3), pp.405-409;2018. 3- DE LOS RIOS, J.P.F., CARRILLO, M.S., DINO, C.G.N., NAVA, J.G.C., LOPEZ, F.H.E., FLORES, M.A.N. and VILLAFAÑE, A.M.;2015. 4-Sameh, ATHMANI, Sihem, ABDERRAHMANE, Fadila, BENACHOUR and Gülfeza, KARDAS. Materials Research Express, 6(1), p.016504; 2018. 5-Bajwa, R., Mukhtar, I. and Mushtaq, S. Canadian Journal of Plant Pathology, 32(4), pp.490-492; 2010.

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ISy59 Molecular Dynamics Investigations of the optical properties of Magnesium Oxide S.Djailia,b,c , A.Gueddimb , B.Agouna, K.Souleha, A.Amoura, T.Smaina aFaculty of Science,Amar telidji , Laghouat, Algeria bFaculty of Science and Technology,Ziane Achour , , Djelfa, Algeria cPhysics department, ENS-Laghouat, Laghout, Algeria + Author for correspondence: [email protected]

The imaginary part of the dielectric fucntion calculated with used the PP method under the DFT approach with GGA-WC exchange correlation forrock-salt MgO the photon energy. After that we concerned by showing the effects of the temperature variation on the optic properties of rs-MgO. The temperature varies from 50K to 900K . The results was plotted in ( Fig. ) as a fucntion of temperature

Keywords:MgO,abinitio calculation, optical properties.

1- A. Gueddim, N. Bouarissa,, A. Villesuzanne, Optik 124 (2013) Energy levels and deformation potentials for rocksalt MgO 2- A. Gueddim, N. Bouarissa, A. Villesuzanne, Computational Materials Science 48 (2010) Pressure dependence of elastic constants and related parameters for rocksalt MgO 3- Y. Fei, Am. Mineral. 84 (1999), Effects of temperature and composition on the bulk modulus of (Mg,Fe)O, 4- John E. Jaffe, James A. Snyder, Zijing Lin, Anthony C. Hess, PHYSICAL REVIEW B 62 ( 2000), LDA and GGA calculations for high-pressure phase transitions in ZnO and MgO

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ISy60 Spatio-temporal aspects of the domain propagation in a spin-crossover lattice with defect H. Oubouchoua ,R. Traicheb, K. Boukheddadenc 1Ecole Polytechnique d’Architecture & d’Urbanisme Route de Beaulieu, BP 177, 16010 El Harrach, Algeria, 2Laboratoire de solutions solides, Faculté de Physique, Université des Sciences et de la Technologie Houari Boumedienne 16111, Bab Ezzouar, Algiers, Algeria. 3GEMAC, Université de Versailles Saint-Quentin-CNRS, Université Paris Saclay, 45 avenue des Etats-Unis, 78035 Versailles, France ;

+ Author for correspondence:[email protected]

We study the spatiotemporal formation and spreading of the high-spin state (HS) during the cooperative relaxation of the photo-induced metastable high spin (HS) state at low temperature of an elastic lattice, in the presence of a defect injected in the center of the lattice. For that, we designed a 2D rectangular-shaped lattice with discrete spins coupled by springs. The distances between the sites are spin-dependent which prevents any analytical resolution of the present problem. The elastic coupling between the spin-crossover (SCO) sites results in a long-range effective interaction between the spin states from which originates the complexity and the richness of this problem. The numerical resolution of the problem is performed using Monte Carlo simulations on the spin states and the atomic positions. The simulations are restricted to a lattice with a hole (simulating the defect) with a fixed size. The presence of the defect shows the dynamics of the spin-crossover transformations starts from one corner of the rectangular lattice and propagates along the width (shortest distance to the surface). Then a second regime of longitudinal propagation takes place, whose velocity slows down significantly in the vicinity of the defect. Then the interface leaves the defect, where it was pinned at low velocity and accelerates when it approaches the border of the lattice. We have also investigated the spatial dependence of the displacement field, from which we derived the spatial distribution of the divergence, which directly connects to the distribution of the internal strain and elastic energy. Valuable information is derived from the time-dependence of the total elastic energy in particular around the defect.

Keywords: Spin Crossover; phase transition; interface propagation; spatiotemporal effects, defects; elasticity; Monte Carlo Simulations.

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ISy61 Deposition of Ag nano particles on different substrate by modified version of CBD M. Nagarbawadi AKI,s Poona College camp, New Modikhana Camp, Pune India + Author for correspondence: [email protected]

Among thin film deposition methods, successive ionic layer adsorption and reaction method is relatively simple, usually require low operating temperature and offers wide range of advantages over other expensive methods of thin film deposition. The performance of this modified CBD method relays on the properties of materials [1]. Now a day‘s SERS method is becoming a powerful tool for analyzing and detecting Raman active material. In SERS technique target molecule is get absorbed on the surface of plasmonic metal nanoparticles after exposing it to the LASER of appropriate wavelength and we get surface enhanced Raman scattering. Ag nanopaticles are well known for their better SERS enhancement due to their narrow plasmonic width in visible range. Successive ionic layer absorption and reduction SILAR method is simple and low cost method used to grow various metal oxide nanoparticle. In this project work various Ag nanoparticles are grown on various substrates like glass paper metal etc by SILAR method. SERS measurements are performed using Ag nanoparticles grown on various substrates.

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ISy62 Parameters influencing the initiation of corrosion cracking in reinforced concrete: role of local materials SK. Sebsadji +, N. Kaid a LMST Laboratory, University USTO-MB, BP1505 El Mnaouer, Oran, Algeria + Author for correspondence: [email protected]

Corrosion-induced concrete cracking is an important indication of durability for reinforced concrete structures. The evaluation of the kinetics of the degradation by corrosion, more pointedly the prediction of the time of the first corrosion induced concrete cracking, can be a key tool in the evaluation of the lifespan of concrete structures. The aim of this paper is to identify the important parameters for the prediction of the time to corrosion-induced cover cracking in reinforced concrete structures time elapsed since the initiation of corrosion. Accelerated corrosion testing was performed to identify the initiation of corrosion and the role of local materials as the natural Algerian pozzolan, through obtained experimental results. This information is important to use in the manufacture of concrete, and enable engineers to optimize concrete formulation, with a focus on the influence of concrete composition, including the possibility of using local materials natural or by products that can improve the durability of reinforced concrete.

Keywords: corrosion, cover cracking, durability, reinforced concrete, pozzolan, accelerated corrosion

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ISy63 Thermal aging of enamelled wire used in electrical machines a a b a a a F. Chaouche , M. Nedjar , F. Belabbas , I. Ben Saidj , A. Lamali , H. Ait Ouazzou aLaboratoire de Génie Electrique, Université Mouloud Mammeri, Tizi-Ouzou, Algérie b Entreprise des Industries Electrotechniques, Azazga, Tizi-Ouzou, Algérie + Author for correspondence: [email protected];

This work reports on the effect of thermal aging on breakdown voltage of enamelled wire used in electrical machines. Thermal aging is achieved on twisted pair specimens of copper wire. This wire is insulated with a layer. of polyamide imide recovered by another layer of polyesterimide. The composite dielectric is of class C (220°C). The aging is carried out at several temperatures: 210°C, 230°C, 240°C and 250°C. The tests are executed until the degradation of the material is reached. The time dependence of breakdown voltage is studied. The breakdown voltage data are analyzed statistically using Weibull model. The study shows that breakdown voltage varies versus aging time. Its increase is allotted to a crosslinking inducing a diminution of mean-free path of charge carriers leading thereby to a mobility decrease, whereas its decrease is attributed to the viscosity diminution expressing a weakening of molecular bonds and a mobility increase of charge carriers. The thermal endurance graph is a straight line indicating that the degradation is governed by a first-order chemical reaction. Activation energy and temperature index are determined. The degradation is ascribed to the dissolution of copper into the polymer and accelerates its degradation occurring at the polyamide imide – copper interface. Oxygen can diffuse into the material and attack copper resulting in the formation of copper oxide. The degradation of the polymer is caused by the scission of bonds. The process is followed by a change in color, a release of gases and a presence of cracks at more advanced stages.

Key words: Enamelled wire, thermal aging, breakdown voltage, degradation.

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ISy65

Synthesis, crystal structure and antitumor activity of new triazole- nitroimidazole hybrid systems Y. A. Al-Soud, a R. A. AL-Qawasmeh, b and S. O. W. Saber b a Department of Chemistry, Faculty of Science, University of Al al-Bayt, Al-Mafraq, Jordan b Chemistry Department, Faculty of Science, The University of Jordan, Amman, Jordan +Author for correspondence: [email protected]

Imidazole is one of the important heterocyclic compound in the aromatic world of medicinal chemistry. It is also a important constituent of several natural products including purine, histidine and nuclic acid. The application of these nitroimidazole containing drugs has widened in various simple and complex diseases. Nitroimidazole derivative are widely used as the anaerobic anti bacterial, antiprotozoal, antifungal, anti HIV agents, radiosensitizers, hypoxic marker etc. In our previous studies some new compounds containing 4- nitroheterocycles with different substituent's at the C5-position of the imidazole ring were synthesized and evaluated for activity against several viral and tumor species. The introduction of 1,2,4-triazole to the imidazole system is expected to influence the biological activities significantly. However, there are few reports about the 1,2,4-triazole substituted imidazole system, which is considerable interest as potential agricultural or pharmaceutical fungicides. In view of the wide continued interest in the activity spectrum and profile of the nitroimidazoles and in continuation of our research on the synthesis and biological evaluation of imidazole/triazole analogs [1-3]. We envisaged to synthesis of new triazole – nitroimidazole hybrid systems via click chemistry as a potential biologically active motifs. Keywords : Synthesis, Imidazoles, Triazoles and Antitumor. 1- M. R Aouad, M. A. Owayad, M. A. Soliman, S. K. Bardaweel, A. A. Ali, M. Messali, N. Rezki, and Y. A. Al-Soud, Molecules, 23, 2787, (2018). 2- Y. A. Al-Soud, N. A. Al-Masoudi, H. H. Al-Suod, and C. Pannecouque, Z. Natufrorschung, 67b (9), 925. (2012). 3- Y. A. Al-Soud, N. A. Al-Masoudi, H. H. Ghaffori, E. De Clercq, and C. Pannecouque, Acta Pharm., 57, 379, (2007).

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ISy66

Simulation of electron trajectory and effect of some trap-parameters: n0 and  on thermoluminescent curves 

Application to alumina (-Al2O3), material dedicated to energies storage

A. Loukil a, +, Z. Yousfia, M. Ghamniaa

a Laboratoire LSMC, Université Oran 1 Ahmed Ben Bella, BP 1620 El-Ménaouer, 31000, Oran, Algeria +Author for correspondence: [email protected]

In this paper, we study the simulation oftrajectory electron trajectory in dielectric materials using win-x-ray software. We show that the electron trajectory is depending on some parameters as primary energy, defect concentration, atomic number… The presence of point defects in dielectric materials is responsible on the themoluminescent emission. The effect of some trap parameters on the thermostimulated bands is depending discussed. We study in particular the influence of the retrapping-recombination ratio on thermoluminescentcurves.

The number of trap parameters introduced into the intensity equationshows well the difficulty of giving a fair and rigorous interpretation to the detected bands-emission thermostimulated. We have analysed deeply the retrapping-recombination ratio effect on the glow curve which is shown to have a retarding effect on the band emission. The trapped charges were applied to the specific defect usually present in alumina (-Al2O3) considered as adapted material to energies storage.

Keywords: Simulation, Defects, Thermoluminescence, Al2O3, Electron trajectory

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ISy67

Evaluation of Hilhost Model to predict pore electrical conductivity using dielectric methods F. Bouksilaa, M. Personb, R. Berndtssonb, c, A. Bahrid a National Institute for Research in Rural Engineering, Waters and Forests, Box 10, 2080 Ariana, Tunisia. b Department of Water Resources Engineering, Lund University, Box 118, SE-221 00 Lund, Sweden. c Centre for Middle Eastern Studies, Lund University, Box 201, SE-221 00 Lund, Sweden d National Agronomic Institute of Tunisia (INAT), 43 Avenue Charles Nicolle, 1082 Tunis, Tunisia + Author for correspondence: [email protected]

To improve soil and water management, dielectric methods are widely used for real time soil water content (θ) and salinity monitoring. However, low cost Frequency Domain Reflectometry (FDR) sensors readings are often biased in saline soil. In this study, under salinity conditions, we evaluate the performance of Hilhost (2000) model to predict pore electrical conductivity ECp from the observed dielectric permittivity (Ka) and bulk electrical conductivity (ECa) using Time Domain Reflectometry TDR and WET (FDR) sensors. A laboratory infiltration experiment was realized on sandy soil to estimate θ and ECp under different electrical conductivity of soil moisture solutions (0.0053–14 dS m-1). Using WET sensor, the RMSE and the mean relative error MRE of the ECp, estimated by Hilhost model, was 4.15 dS m-1 and 40 %, respectively. However, by replacing the standard soil parameter

(K0) in the Hilhorst model by a third-order polynomial K0-ECa relationship, the RMSE of ECp decreased to 0.68 dS m-1 and the MRE to 8 %. In saline soil, the WET sensor could give similar accuracy to estimate ECp than TDR if calibrated values of the soil parameter were used instead of standard values in Hilhost model.

Keywords: Soil salinity, Dielectric methods, Frequency Domain Reflectometry, Time Domain Reflectometry, Hilhost model

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ISy68 Comparison of two Schiff bases containing O-methyl and nitro substitutes for corrosion inhibiting of mild steel in 1 M HCl solution A.Elyoussfia,+,A.Dafalia,A.Elaatiaouib, Koudad.Mb, N.Benchatb,A.Zarroukc a Laboratory of Applied Analytical Chemistry, Materials and Environment LC2AME - Faculty of Sciences, UniversityMed1st b Laboratory of Materials, Nanotechnology and Environment, Faculty of Sciences, , P.O. Box. 1014, Rabat, Morocco c LCAE-URAC18, Laboratory of applied Chemistry and environment, Faculty of Sciences, UniversityMed1st,M.B.717, Oujda, Morocco. + Author for correspondence : [email protected] (A.Elyoussfi). [email protected] (A. Dafali)

Two new Schiff bases, (E)-2-methoxy-4-(((7-methyl-2-phenylimidazo [1, 2-a] pyridin-3- yl)imino) methyl)phenol(EA1 )) and (E)-N-(7-methyl-2-phenylimidazo[1, 2-a]pyridin-3-yl)- 1-(4-nitrophenyl)methanimine(EA2)), were investigated as corrosion inhibitors for mild steel in 1 M HCl solutionusing weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopymeasurements. The results revealed that the Schiff bases act as effective corrosion inhibitors and the inhibitionefficiency was increased by increasing inhibitors concentration. The adsorption of these compounds obeyedthe Langmuir adsorption isotherm.

Figure 1 Pictorial representation of adsorption of EA1 on carbon steel surface in 1 M HCl solution

The EA1 molecule possessing an electron-donating O-methyl substituteshowed a better inhibition performance in comparison with the EA2 with nitro substitute, because of the positiveeffect of its electron–donating substitute.The theoretical studies, in agreement with experimental outcomes, showed higher

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inhibition efficiency for EA1. It also showed that the EA2molecules oriented not beneficially on metal surface which provided a low surface coverage, and thus, a lowerinhibition performance. Keywords:Corrosion, inhibition, Schiff basesderivatives, adsorption,electrochemical techniques 1- A. Elyoussfi , A. Dafali , H. Elmsellem , H. Steli , Y. bouzian , K. Cherrak , Y. El Ouadi , A. Zarrouk , B. Hammouti J. Mater. Environ. Sci. 7 (9) (2016) 3344-3352. 2- K. Cherrak, A. Dafali, A. Elyoussfi, Y. El Ouadi, N. K. Sebbar, M. El Azzouzi, H. Elmsellem, E. M. Essassi, A. Zarrouk, JMES, 2017 Volume 8, Issue 2, Page 636-647 3.A. Elyoussfi, A. Dafali, H. Elmsellem , Y. Bouzian, R. bouhfid, A. Zarrouk,K. Cherrak, E. M. Essassi, A. Aouniti and B. Hammouti Der Pharma Chemica, 2016, 8(4):226-236 4. AbdelkaderZarrouk, BelkheirHammouti, Ali Dafali , Mohammed Bouachrine , Hassan Zarrok , Said Boukhris, Salem Salem Al-DeyabJournal of Saudi Chemical Society (2014) 18, 450–455 5. 6.Sudheer and Mumtaz Ahmad Quraishi dx.doi.org/10.1021/ie401633y | Ind. Eng. Chem. Res. 2014, 53, 2851-285 A.S.Fouda1,*, Ali H. El-Azaly2, R. S. Awad1, A.M. Ahmed Int. J. Electrochem. Sci., 9 (2014) 1117 – 1131

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ISy69

Electrical Characterization of Cu2SnS3 by Hall effect measurements for photovoltaic applications R. Mahdadi a, b, +, A. Bouloufa a, b a Electronics Department, Faculty of Technology, Ferhat Abbas Sétif-1 University b Electrochemical and Materials Laboratory, Ferhat Abbas Sétif-1 University Maabouda Street Sétif, 19000, Algeria + Author for correspondence: [email protected] Cu2SnS3 single crystal was grown by a melting growth method. The stoichiometric mixture of Cu (99.999%), Sn (99.99%), and S (99.99%) were charged a quartz ampule and was sealed at to a pressure of 2x10-6 Torr. The ampule was then inserted into a carbolite furnace, heated up to 1100 °C in three steps with rates at 0.5, 0.5 and 2 °C/h The molten mixture was kept at this temperature for 24 h. After, it was cooled at a rate of 0.5 °C/h up to 1000 °C and maintained at this temperature for 12 h, then at 0.5C/h to 600 °C. The cooling rate from 600 to 300 °C was 0.5 °C/h. The furnace was then turned off and cooled down to the room temperature. Electrical parameters were carried out by Hall Effect measurements (Ecopia HMS 5300 system). The p-type material was observed. At room temperature, carrier concentration, conductivity and mobility were 9.55x1014 cm-3, 0.194 Ωcm-1 and 1.27x103 cm2/Vs respectively. Measurements at low temperatures (80 K – 264 K), activation energies of 163 meV and 105 meV were determined from Arrhenius plot of ln(σ) versus 1/T in the temperature ranges: 120 - 133 K and 230 K - 264 K, respectively and a band gap energy of 0.92 eV from ln(p) versus 1/T. These results are in good agreement with these published [1- 2].

Keywords: Cu2SnS3, Electrical Properties, Activation energy, band gap

1- A. Kanai, H. Araki, A. Takeuchi and H. Katagiri, Phys. status solidi, 2015, 252, 1239–1243. 2- M. Nakashima, J. Fujimoto, T. Yamaguchi and M. Izaki, Appl. Phys. Express, 2015, 8,042303.

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ISy70

The influence of annealing on the properties of ZnO:Al thin films obtained by sol-gel method for solar cells applications A. Bouloufaa,b,+, R. Mahdadi a,b a Electrochemical and Materials Laboratory, Ferhat Abbas Sétif-1 University, Algeria b Electronics Department, Faculty of Technology, Ferhat Abbas Sétif-1 University, Algeria + Author for correspondance : [email protected]

In this study, We investigated the properties of ZnO:Al thin films grown by sol-gel method obtained by means of annealing treatments [1-3]. The ZnO:Al and ZnO films have similar structure, showing the polycrystalline structure with a preferential orientation along c-axis (002) at low at.%Al concentration. The crystallinity increased obviously with the annealing temperature except at 550 °C. The FWHM was decreased by increasing the annealing temperature. The heavily Al-doped ZnO films could be also obtained the similar order of resistivity for the zinc oxide films doped with less aluminum. The reason may be due to the grain size in this study (30–50 nm) was much smaller. In addition, the conductivity of ZnO:Al film was closely related to crystallinity, carrier concentration and mobility. Electrical and optical properties of the ZnO:Al films improved with increasing Al content. However, too high Al content (≥5%) resulted in deteriorated properties. The lowest resistivity of 6.57x10-4 Ω cm was obtained at Al (2%). The excellent transmission in the visible region decreased substantially at short wavelengths near the ultraviolet range for films prepared at.% Al. The shift of absorption edge was probably attributed to the difference in grain size, which was affected by the annealing temperature. The value of energy bandgap for undopped ZnO is about 3.2 eV, but increases for doped ZnO thin films for various annealing temperatures with increasing Al (%) from 1 to 3%. A maximum value obtained is 3.27 eV. Keywords : ZnO:Al, Sol-gel, Solar cell, Thin film, OTC 1- T. Ivanova, A. Harizanova, T. Koutzarouva, B. Vertrueyen, Superlattices ans Microstructures, 2015, 85, 101- 111. 2- E. Muzavi, M. Khanlary, Z. Khakpour, J. Luminescence, 2019, 216, 116696. 3- S. Aydemir, S. Karakaya, Optik, 2015, 126, 1735-1739.

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ISy71

Investigation about the behavior of curie temperature in lithium niobate doped Zn S. Bouazzaa, B. Mohameda, N. Masaifa aUniversité Ibn Tofail, Département de Physique, Faculté des Sciences, BP 133 Kénitra, Morocco + Author for correspondance : [email protected];

We investigate the curie temperature in lithium niobate doped Zn. In particular, the effect of doping both on lithium niobate structure and curie temperature is studied. However, we have proposed a new chemical formulas models to describe the scheme corporation of Zn in lithium niobate and we have applied the models in the theory of transition for discussing the change behavior of curie temperature.

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ISy72

Removal of nitrate ions from water by electrochemical reduction on Cu- modified multi-carbon walled electrode catalysts H. Nassar, a H. Hilala and A. Zyoud a a SSERL, Department of Chemistry, College of Sciences, An-Najah National University, Nablus, Palestine + Author for correspondence: [email protected]

Purification of water from the hazardous nitrate ions is being studied here. The electrochemical reduction study of nitrate is underway in an undivided electrochemical cell. A new modified nanocomposite electrode, that involves nano-copper particles deposited onto multi-walled carbon nanotubes onto FTO/Glass (Cu/MWCNT/FTO) has been prepared and examined. The electroreduction has been performed at relatively low working potential (~ - 1.8 V) which is advantageous to earlier literature reports. Removal of ~75% of nitrate during the first 120 min, has been observed, which is another virtue for this work.

Key words: Nitrate ion removal; Electrochemical reduction; Electrochemical catalysis; Carbon nano-tubes; Water purification.

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ISy73 Optical and Chemical Investigations of PEOIncorporated with Curcumin Nanoparticles Thin Films: Effect of Film Thickness M-Ali AL-Akhrasa, A. Telfahb, M. Telfaha, M.N. Shakhatreha,+ a Department of Physical Sciences, Jordan University of Science & Technology, P.O. Box 3030, Irbid-22110, Jordan. b Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V. 44139 Dortmund, Germany + Author for correspondence: [email protected]

Nanocomposite thin films of doped Polyethylene oxide (PEO) with curcumin nanoparticles (NPs) have been deposited on oxygen plasma activated quartz substrate using spin coating technique. Mixture of AgNPs-AgNO3 was prepared as a stock solution for completing the doping process of PANI-CSA-PEO by adding sequential dose of the mixture in wt% ratio. A set of samples with differentthicknesses were prepared. Oxygen plasma was used to clean and to activate the quartz substrate surfaces. Scanning Electron Microscope (SEM) was used to study morphological properties.SEM picture show thatCurcumin NPsdue has spherical shapes with an average size less than 100 nm and the agglomeration exhibited by the particles. Fourier Transform Infrared spectroscopy (FTIR)used to study the vibrational bands. Vibrational bands observed at 1023 cm–1and 1120 cm–1 which assigned to stretching of C–O stretching vibration. Optical properties were obtainedby absorbance, transmittance andrefractive index (n) of UV-Vis spectra. Transmittance of PEO-Curcumin decreases with increasing curcumin NPs content. Calculated refractive index (n) from UV-Vis data falls in the range between 1.5 and 2. Band gap energy of PEO thin film was found to be 4.15 eV, while Curcumin NPs has a band gap energy of 2.47 eV. PEO doped Curcumin NPs thin film has a band gap energy of 2.49 eV. Optical band gap decreases when adding Curcumin NPs. Keywords: Thin films, PEO, Spin coating, Nanostructures, Optical properties, Structural properties

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Study of some properties of pure and Mg- doping of MnO nanofilms synthesized by spin coating route M. A. Dahamni1,2,+, F. Keddar1, A. Ouhaibi3 and S. E. Nacri1 1 Laboratoire LSMC, Université Oran 1, 31000, Oran, Algérie 2 Centre Universitaire de Relizane, Relizane, 48000, Algérie 3CDTA, Alger, Algérie + Author for correspondence: [email protected]

In this work, we are interested to the synthesize of MnO nanofilms using spin coating technique. The procedure consists to prepare solution by dissolving Mn chloride in distilled water at 0.3 concentration. The solution was deposited on glass substrates heated at 500°C. The obtained MnO nanofilms were characterized by XPX for checking chemical composition, by atomic force microscope for surface morphology and by uv-visible spectrometer for transparency properties. Mg-MnO doping improves the surface morphology where the roughness is decreasing with increasing of Mg doping. The transmittance yield of MnO nanofilms is decreasing versus Mg doping concentration.

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ISy74 Optical Properties and Photoisomerization Processes of Nanocomposite Thin Films Based on PMMA-BDK-MR doped by Silica NPs T. Mahmouda, + a Department of Physical Sciences, Jordan University of Science & Technology, P.O. Box 3030, Irbid-22110, Jordan. + Author for correspondence: [email protected]

A novel Nano composite thin films based on azo dye methyl red (MR) hosted in polymethylmethacrylate (PMMA) incorporated with Benzyl dimethyl ketal (BDK) as a photo- initiator and doped by silica NPs were prepared by dip coating technique on fused silica substrates. Weight percent ratios of 0%, 2.5% and 5% of silica NPs with respect to MR content have been studied in order to investigate the optical, chemical and thermal properties of (PMMA-BDK-MR)/silica NPs Nano composite thin films by employing UV-Vis spectrometer, Fourier-transform infrared spectroscopy (FTIR) and Thermogravimetric analyser (TGA). The existence of Azo Dye MR in the composite was intentional to perform the cis ↔ trans cycles through illumination ↔ thermal relaxation for Write/Read/Erase optical data storage and UV-light sensors. UV-Vis and FTIR results were tested the hysteresis cycle of trans- and cis-states and found that (PMMA-BDK-MR)/silica NPs thin films could be successfully used in Write/Read/Erase optical data storage and UV-light sensors. Finally, it can be concluded from TGA that the weight loss of the Nano composites is reversibly proportional to the silica NPs concentration indicating the strengthen of physicochemical bonding density by increasing the dopant degree with silica NPs. Keywords: Thin Films, Nano composite, optical data storage, UV-light sensors, SiO2 nanoparticles (silica NPs), Polymethylmethacrylate (PMMA), BenzylDimethylKetal (BDK), Azo Dye Methyl Red (MR), and UV-curing.

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ISy75 Study of some properties of pure and Mg- doping of MnO nanofilms synthesized by spin coating route M. A. Dahamni1,,+2, F. Keddar1, A. Ouhaibi3 and S. E. Nacri1 1 Laboratoire LSMC, Université Oran 1, 31000, Oran, Algérie 2 Centre Universitaire de Relizane, Relizane, 48000, Algérie 3CDTA, Alger, Algérie +Author for correspondence: [email protected]

In this work, we are interested to the synthesize of MnO nanofilms using spin coating technique. The procedure consists to prepare solution by dissolving Mn chloride in distilled water at 0.3 concentration. The solution was deposited on glass substrates heated at 500°C. The obtained MnO nanofilms were characterized by XPX for checking chemical composition, by atomic force microscope for surface morphology and by uv-visible spectrometer for transparency properties. Mg-MnO doping improves the surface morphology where the roughness is decreasing with increasing of Mg doping. The transmittance yield of MnO nanofilms is decreasing versus Mg doping concentration.

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ISy76 Prediction of phosphate ore interfacial adhesion to the various in situ metal supports M.Medkour,a,+ Y.Najih,a J.Bengourram,a H.Latrache,b M.Mabroukia

a Industrial Engineering Laboratory, Faculty of Sciences and Technologies, Sultan Moulay Slimane University, Beni Mellal 23030, Morocco b Bioprocess and Biointerfaces Laboratory, Faculty of Sciences and Technologies, Sultan Moulay Slimane University, Beni Mellal 23030, Morocco

+ Author for correspondence: [email protected]

Phosphate extraction is a basic step in the mining process. In order to guarantee high efficiency, this step must be controlled in a way to reduce or eliminate all forms of losses. Adhesion of phosphate on metal supports is among the major problems that cause significant losses. During transport, for example, losses can reach 25% due to clogging. To understand the macroscopic phenomenon, we performed micro/nano wettability tests at the interface that connects our main compounds.

First, we calculated surface energies [1] of the elements involved: phosphate and metal. Then, we predicted the adhesion of different types of phosphate on different metallic substrates. The initial results show that phosphate is always hydrophilic [2] and that it is the metallic supports which favor or disadvantage the adhesion. At this stage, we already have an idea about the possibilities of adhesion by energetic study. Other parameters remain to be studied, such as surface state of metals (roughness) as well as atmospheric conditions (water content, temperature and pressure).

Keywords: Phosphate, Interfacial adherence, Metals

1- F. Hamadi, H. Latrache (2008): Comparison of contact angle measurement and microbial adhesion to solvents for assaying electron donor electron acceptor (acid-base) properties of bacterial surface. Colloids and Surfaces. B, Biointerfaces, 65(1), 134–9. 2- M. Morra, C. Cassinelli (1997): Bacterial adhesion topolymer surfaces : A critical review of surface thermodynamic approaches. J Biomater Sci Polymer Edn 9 : 55-74.

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ISy77 Optical properties of CuGa0.3In0.7Se2 thin films grown by CSVT technique under various atmospheres A. Bouloufa a,b, M. Lasladj a,b,+ a Electrochemical and Materials Laboratory, Ferhat Abbas University of Sétif-1, 19000, Sétif, Algeria b Electronics Department, Faulty of Technology, Ferhat Abbas University of Sétif-1, 19000, Sétif, Algeria + Author fro correspondence: [email protected]

In this work, we present results obtained by annealing CuGa0.3In0.7Se2 (CIGS) thin films absorbers for solar cells applications in various atmospheres (air, Selenium and Argon) using photoacoustic spectroscopy technique [1-2]. Absorbers were deposited on soda-lime glass and Mo/ soda-lime glass substrates by a low cost close-spaced vapor transport (CSVT) technique at various substrate temperatures (440 °C and 500 °C) [3-4]. Solid iodine was used as the transporting agent and it is kept in the lower-temperature region. The schematic drawing of the CSVT system is shown. The zone of reaction consists of a graphite cell placed in a quartz reactor by placing a CIGS graphite source block in close proximity (1mm) to the graphite substrate block. The deposition time was 15 min for all the samples deposited. The resulting films are polycrystalline with a grain size depending on the substrate temperature and iodine pressure in the reactor. Depending on the combination of the growth parameters given above, it was possible to obtain grain sizes between1 and 3 µm and p-type conductivity. The quality of absorbers is analyzed by XRD, SEM, energy dispersive spectroscopy and electrode probe. The changes in the defect states during the annealing processes are investigated using photoacoustic measurements. Non-radiative transitions were detected, which are associated with shallow and deep levels. Annealing in various atmosphers confirm the improvement of cristallinity of samples and strong changes in films structure. Keywords: CIGS, Thin film, Photoacoustic spectroscopy, CSVT, Annealing

1- A. Bouloufa, K. Djessas, A. Zegadi, Thin Solid Films, 515, 6285-6287, 2007. 2- O. Abounachit, H. Chehouani, K. Djessas, Thin Solid Films, 520, 4841-4847, 2012. 3- Yu Zhao, JiaDa Wu and Ning Xu, M ATER. RES. EXPRESS, 3, 106402, 2016. 4- Julia I. Deitz, Shankar Karki, Sylvain X. Marsillac, Tyler J. Grassman, and David W. McComb, J. Appl. Phys. 123, 115703, 2018.

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ISy78 First-principal study of electronic and optical properties of Ba2ZnWO6 double perovskite S.Hamzaa, +, B. Badera a, N. Benseddik b, Z. Nabi a, T. Bellakhdar a a Condensed Matter and Sustainable Development Laboratory, Physics Department, University of Sidi-Bel-Abbès, 22000 Sidi-Bel-Abbès, Algeria, bLaboratory of Applied Micro Electronics, University Djillali Liabes of Sidi Bel Abbes, 22000 Sidi Bel Abbes, Algeria

+ Author for correspondence: [email protected]

Full-potential augmented plane wave (FP-LAPW) method is applied to study the structural, electronic and optical properties of double perovskite tungstate Ba2ZnWO6, crystallizing in a cubic prototype with a space group Fm3m. The structural properties are studied and optimized particularly on the volume. The bulk modulus and pressure derivatives have been obtained too. Electronic band structures are calculated using the density functional theory (DFT) [1-2], with generalized gradient approximation (GGA), implemented in wien2k code [3]. Density of states and charges are simulated and presented. Optical spectra‘s calculations as real and imaginary parts of the dielectric function are exhibited. The whole obtained results are consistent with the experimental data and other theoretical one [4], and are useful in understanding such perovskite material to explore its potential applications.

Keywords: double perovskite, band structure, density functional theory, electronic structure, wien2k.

1- Hohenberg P and Kohn W 1964 Phys. Rev. 136 B864 2- Kohn W and Sham L J 1965 Phys. Rev. 140 A1133 3- Blaha P, Schwarz K, Madsen G K H, Kvasnicka D and Luitz J 2001 WIEN2k, an Augmented PlaneWave + Local Orbitals Program for Calculating Crystal Properties (Karlheinz Schwarz Technische University at Wien, Austria) ISBN 3-9501031-1-2 4- S. Meenakshi et al, J. Phys.Chem.Solids72(2011)609

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ISy79 Stability analysis of blue TADF OLEDs using impedance spectroscopy A. Soo Jong Park, a B. Yooji Hwang, a C. Byeong-Kwon Ju a+ a Display and Nanosystem Laboratory, College of Engineering, Korea University, Seoul 136- 713, Republic of Korea + Author for correspondence: [email protected]

Thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) have been widely researched and developed for next generation display due to the high internal quantum efficiency (IQE). [1-2] TADF OLEDs show high IQE, but the stability of the device is generally poor compared to that of phosphorescent OLEDs. Therefore, the lifetime of blue TADF OLEDs is still poor, and there have been attempts for improving the operational stability of blue devices. In this study, impedance spectroscopy analyzes the capacitance-voltage characteristics of blue TADF OLEDs to investigate their degradation characteristics. Charge accumulation occurs in blue device; to diversify the type of devices analyzed, the hole-injection barrier of the emissive layer (EML) was controlled by varying the hole transport layer (HTL) materials. Comparisons of the peak capacitance values of reference devices with those of aged devices demonstrate that the peak capacitance drop is related to the operational stability of the devices. Because the interface between the HTL and EML affects the capacitance value, the stability of this interface in turn affects the operational stability of the devices. Consequently, operational stability of the blue TADF OLEDs can be predicted by using the impedance spectroscopy method.

Keywords: organic light-emitting diodes, thermally activated delayed fluorescence, blue device, stability, impedance spectroscopy

1- H. Uoyama, K. Goushi, K. Shizu, H. Nomura, C. Adachi, Nature, 492, 234 (2012). 2- J. W. Sun, J. –H. Lee, C. –K. Moon, K. –H. Kim, H. Shin, J. –J. Kim, Adv. Mater. 26, 5684 (2014). 3- D. Zhang, M. Cai, Y. Zhang, D. Zhang, L. Duan, Mater. Horiz. 3, 145, (2016).

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ISy80 Influence of applied potential in the TiO2 Nanotubes formation on Ti foil by electrochemical anodization O. Zakira,b, M. Khadiri a,b, R. Idouhli a, Y. Koumya a, M. Elyaagoubi b, A. Abouelfida a, A. Benyaich a, A. Outzourhit b a Laboratory of Physical Chemistry of Materials and Environment, Department of Chemistry, University Cadi Ayyad, Faculty of Science Semlalia, BP 2390, MARRAKECH, MOROCCO b Laboratory of nanomateriels for energy and environment, Department of physics, University Cadi Ayyad, Faculty of Science Semlalia, BP 2390, MARRAKECH, MOROCCO..

+ Author for correspondence: [email protected]

Titanium oxide has gained a wide interest among researchers for its photocatalytic applications. In order to obtain oxide titanium, various techniques were carried out such as, sol-gel technique, sputtering and anodization of titanium. In this sense, the main focus of this work is to prepare a nanoporous oxide titanium by the anodization of pure titanium substrate foils under self-organization condition; anodization parameters such as anodization time, voltage and electrolyte composition are critical for the resulting morphology. The scanning electron microscopy has shown that the pores formed at 40V are distributed uniformely. Furthermore, the analysis of films by Energy Dispersive X-ray Spectroscopy (EDS) shows that the formed layer under all conditions is made up essentially of TiO2 According to the X- ray Diffraction (XRD) and Raman Diffraction analyses, the nanotubular arrays of TiO2 calcined at 600°C for 2 hours are composed of a phase mixture (anatase and rutile).

Electrochemical measurements by Mott-Schottky show that electrical behavior of TiO2 nanotubes is an n-type semiconductor with a donor density of about 1020cm-3. Keywords: Titanium,oxide, nanotube, anodization, SEM-EDX, DRX, Raman spectroscopy, Mott-Schottky and electrochemical impedance spectroscopy.

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ISy81 Optimization of a thermoelectric circuit for optimal functioning A. Narjisa,+, A. Mellaloua, A. Outzourhita a Nanomaterials for Energy and Environment Laboratory, Cadi Ayyad University, PB, 2390, Marrakech, Morocco +Author for correspondence: [email protected]

Optimizing a thermoelectric generator (TEG) to supply a load in an optimal way is a difficult task because of the heat exchanges which taking place in the TEG-heat sources system. In this paper we consider a variable thermal inductivity along the TE legs of the generator and we discuss the optimal relation of the resistance of the generator (RTE) and that of the load (RL). Thus, the reversibility, or not, on one side or the other gives different optimal circuits. In particular, if symmetric thermal exchanges are considered, the ratio RL/RTE is near unity for a given value of the figure of merit (ZT). This is different from the commonly claimed values, 1 and (1+ZT)1/2. Keywords: Thermoelectric generateur; Renewable energy; Thermal exchanges.

1. A Narjis, C-T Liang, H El Aakib, A Tchenka, A Outzourhit. Journal of Electronic Materials 49 (2020) 306–310. 2. L. Baranowski, G.J. Snyder, S.E. Toberer, and E.S. Toberer, J. Appl. Phys. 115, 126102 (2014). 3. G. Zhang, K. Jiao, Z. Niu, H. Diao, Q. Du, H. Tian, and G. Shu, Int. J. Heat Mass Transf. 93, 1034 (2016).

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ISy82 Dielectric properties of photorefractive sillenite crystals under illumination V.T. Avanesyan a, I.V. Nadoyana a The Herzen State Pedagogical University of Russia + Author for correspondence: [email protected]

Achievements of nonlinear optics stimulate the development of physical materials science and the creation of technologies for new materials in electronic technology. Photorefractive sillenite crystals Bi12SiO20 (BSO) as materials of nonlinear optics and holography are currently the subject of research. Bismuth silicate cubic crystals (BSO) possess such properties as electrical and photoconductivity, photoluminescence due to defects in the crystal lattice, which can act as trap generators, forming local centers near the upper edge of the valence band and the lower edge of the conduction band which is the condition of the presence of the tail of Urbach. The formation of defect centers in the BSO structure is due to 3+ the replacement of Si4 silicon ions in SiO4 tetrahedra by Bi cations, which include an unshared electron pair with an asymmetric electron cloud configuration. Thus, the anti- structural BiSi3 and BiSi5 ions replace Si4 atoms in oxygen tetrahedra, forming a defect (Bi3++ h). Varying the ratio between the defect centers due to a change in their charge state according to the scheme: Bi5+→2e→ Bi3+ leads to the photochromism observed in the materials under study. The charge compensation of Bi5+ and Bi3+ ions is provided by hole centers O-. Light excitation of relaxators with the content of the indicated lone pair leads to a high polarization activity of the crystal structure. In the process of photoexcitation of the investigated crystals, optical recharging of deep and shallow local states in the band gap is likely. Keywords: sillenite crystals, defect centers, polarization, relaxators 1- V. T. Avanesyan, I. V. Piskovatskova, V. M. Stozharov, Semiconductors, 53, 8, pp.1024–1027 (2019). 2- V. T. Avanesyan, I. V. Piskovatskova, Semiconductors, 54, 1, pp. 22–24 (2020).

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ISy83

Synthesis of CuO nanowires with controlled density L.Nkhailia, A. Narjisa, A. Elkissania, A.Agdaga,A.Outzourhita a Nanomaterials for Energy and Environment LaboratoryFaculty of Sciences Semlalia, Cadi AyyadUniversity, PO Box: 2390, Marrakech 40000, Morocco + Author for correspondence:[email protected] Copper oxide Nanowires (CuO NWs) are very promising for nanotechnology. CuO NWs were synthesized by thermally oxidizing copper films at various heating rates. It has been shown that both monoclinic CuO and cubic Cu2O phases were grown on the copper surface with NW diameters of almost 200 nm for all samples. Arrays of CuO nanowires with a wide range of diameter (40-500 nm), length (0,25-5 μm) and density (1x108-8x109nanofils/cm2) were obtained. Structural properties have been studied by X ray Diffraction (XRD) technique. Optical properties (especially the refractive index, absorption coefficient and optical band gap) were investigated by optical transmission measurements in the Ultraviolet-Visible-Near Infrared (UV-Vis-NIR) wavelength range The morphological characterization of the obtained CuO nanowire were carried out using electron microscopy (SEM ).

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ISy84 Study of Glass-Forming Ability and Glass Stability of chalcogenide Glasses by Thermal Properties L. Heirechea, M. M. Heirechec, M. Belhadjib aLaboratoire de génie électrique et matériaux Ecole Supérieure en Génie Electrique et Energétique d’Oran Algeria bDépartement de physique, Université d'Oran 1 Ahmed Ben Bella, Oran, Algeria. cDépartement des sciences exactes, Ecole normale supérieure d’Oran, Oran, Algeria. + Author for correspondence:[email protected]

Different methods have been performed to understand the relationships between microscopic structures and the glass transition. Chalcogenide glass based on Tellurium Te and Selenium Se systems were investigated to define the glass forming ability. Parameters considered are number of constraints per atom, average coordination number and mean bond energy. The compositional dependence of these parameters is discussed in correlation with experimental obtained density. The stability of the glasses is confirmed through thermal properties study. The relation between the values of glass transition temperature calculated by Tichy-Ticha, Lankhorst and Sreeram approaches and average coordination number is also discussed.

Keywords: Chalcogenide glass, glass transition, thermal parameter, coordination number.

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ISy85 Addition of microcrystalline cellulose to an alkyd resin/titanium dioxide film: Effect on dielectric properties El-h. Ablouha, b, A. Zyanea, F. Brouillettec, A. Belfkiraa aBioorganic and Macromolecular Chemistry Laboratory, Department of Chemistry, Faculty of Sciences and Technology, Cadi Ayyad University, 40000, Marrakesh, Morocco bCenter of Analysis and Characterization, Cadi Ayyad University, 40000, Marrakesh, Morocco cInnovations Institute in Ecomaterials, Ecoproducts, and EcoEnergies - Biomass Based (I2E3), Université du Québec à Trois-Rivières, Trois-Rivières, QC, G9A 5H7 Canada + Author for correspondence: [email protected]

The combination of organic and inorganic phases is a convenient way to obtain materials with properties not found in organic polymers or inorganic materials.In this study, various composite films were prepared by varying the amounts of long-oil alkyd resin (AR), titanium

dioxide (TiO2) and microcrystalline cellulose (MCC). The effects of each component, TiO2 and MCC, on the properties and microstructure of the dry film were determined by examining images obtained by scanning electron microscopy (SEM) and studying the evolution of dielectric properties, the dielectric constant and the loss factor, against frequency at room temperature.The results showed that the introduction of the TiO2/MCC powder with a weight ratio greater than 1 and a volumetric concentration of pigment (VPC) less than 50% allowed better dispersion of the particles accompanied by an increase in the dielectric constant ('). The evolution of 'did well with the Linchtencker logarithmic mixing law and the Maxwell- Garnett theory.

Keywords: Microcrystalline cellulose, titanium dioxide, alkyd resin, dielectric properties, composites, thin film.

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ISy87 Experimental charge and discharge current in Polyethylene Naphthalene (PEN) A. Berkanea, H. Oubouchoub+, aPhysics Faculty, Material Physics Laboratory University of Science and Technology (USTHB), BP N° 32 El-Alia, Algiers (Algeria) bEcole Polytechnique d’Architecture & d’Urbanisme Route de Beaulieu, BP 177, 16010 El Harrach, Algeria, + Author for correspondence: [email protected]

The present paper deals with the study of Poly(ethylene-2,6-naphtalene dicarboxylate) (PEN) which are polymer widely employed in Electrical Engineering and audio-visual applications, this is because it combines such important characteristics as outstanding mechanical strengths, superior electrical properties, better heat resistance, excellent dimensional stability, etc[1]., the film used in our experience is provided by Dupont de Nemours Luxembourg, (25µm semicrystalline PEN) , the sample is coated with an aluminium electrodes of 20mm diameter and 60nm thick by a sputtering technique in primary vacuum. The protocol in the charging and discharging times was of up 2hours for every D.C. step voltage applied and delivered by Hewlett Packard stabilised power supply. The transient current were recorded by a computer by the means of keithley 617 programmable electrometer, utilizing a bus IEEE 488.[2] . Typical examples of charging and discharging currents obtained for various fields over a period of time extending up to 2 hours. A temperature of 120°c was applied across the sample, the charge and discharge current behaviour changes when field‘s increases, Several researchers studied the effect of the field on the PEN, [3.4]

Keywords: PEN, Chargeand discharge, keithley 617, aluminium electrodes.

1- S. Yasufuku, ″Application of Poly (ethylene naphthalate) Films to Electrical and Audio-visual uses in Japan,″ IEEE Electr. Insul. Mag., Vol. 12, No. 6, pp.8-14, (1999). 2- N.Saidi Amroun "Contribution a l'étude de la conduction électrique dans le polyéthylène téréphthalate, le polyéthylène basse densité et le polyimide en fonction du champ électrique, de la température et de la pression", PhD thesis, University of Science and Technology, Algiers, (2001). 3- R A Fouracre , J W Mackersie, M J Given, Influence of Gamma Radiation on the Properties of Polyethylenenapthalate (PEN), ICSD,International Conference on Solid Dielectrics, Toulouse, France, July 5-9, (2004). 4- J. Guastavino, D. Mary, E. Krause, C. Laurent & C.Mayoux*, On the Electrical Properties of Poly(ethylene naphtalate -2,6-dicarboxylate) Biaxially-oriented Films, Polymer International 46 pp.72-76, (1998).

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ISy88 Influence of roughness on the physicochemical properties of stainless steels Y. Najih, a, + M. Medkour, a M. Adar, a J. Bengourram, a N. Kouder, a M. Mabrouki a a Industrial Engineering Laboratory Sultan My Slimane University Beni Mellal, Morocco + Author for correspondence: [email protected]

The adhesion of phosphate to solid supports such as steels is the result of competition between different types of interactions involving the phosphate particles and the surface. In this work, we characterized stainless steel supports by calculating physicochemical parameters such as surface energy and also by atomic force microscopy. the stainless steels used are: 304, 304L, 316 and A36 with different roughness. this study was carried out to evaluate the adhesion of phosphate on the supports of the steels and also to study the interactions involving the phosphate particles and the surface. The challenge of this work is to determine the influence of physicochemical and also topographical (roughness) factors on this process in order to properly consider the clogging phenomenon. The results obtained showed that the increase in roughness systematically decreased the surface energy values. Furthermore, the analysis by atomic force microscopy also showed that topography directly influences the physicochemical properties of stainless steels, which led us to predict and understand the phenomenon of phosphate clogging on steels.

Keywords: Stainless steel, physicochemical parameters, surface energy, roughness.

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ISy89 Caractérisations électriques des cellules photovoltaïques à haut rendement» S. Rachedia,+, D. Bensaida, M.Berrahala, N. Moulayea a Centre Unversitaire Ain-Temouchent Physico-Chimie des Matériaux Avancés Etablissement de rattachement du laboratoire de recherche : Université DJILLALI Liabes De Sidi Bel Abbes + Author for correspondence: rachdisamia @yahoo.fr

They are diodes p + nn + with structure MESA, of carbide silicon (6H-SiC), worked out by the IOFFE institute (1) of Petersburg Saint within the framework of the project in collaboration with Merlin-Gerin. Having the characteristic to have undergoes a technological stage, which are that of the diffusion of boron, and this with an aim of increasing the behavior in tension. Our role consisted in carrying out a study evolution of characteristics I-V according to the temperature, the behavior in tension. Key words: Structure MESA, SiC, caracterization voltage.

-2 métal 10 Diode-épitaxiée- SiC ( 6H ) 10-3 273 K couche d‘oxyde 10-4 243 K 203 K Zone 3 10-5 173 K + + -6 143 K n / p g 10 Zone 2 j 113 K 10-7 77 K G

-8  ( A ( )

d 10 Zone 1 I I 10-9 p / n 10-10 -11 10 + + -12 p / n (substrat ) 10 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Vd ( v )

Figure 2, represents the characteristics voltage on line, according to the temperature, obtained on diodes . Fig. 1. Section longitudinal of has diode with structure MESA

1- Lanois F et all.: Angle etch control for silicon carbide power devices: . Appl phys. Lett., vol, 69, n°2, pp. 236- 238, 1996. 2- Lebedev A. A et all. , Electroluminescence of aluminum-doped 6h-siC pn structures. Sov. Phys. SemicondEur. Vol. 28, n°10. 1994, pp. 981-984. 3- Lebedev A. A et all., Pwer silicon Carbide devices based on lely gown substrates. Pro. 7th Int. Symp. On Power semiconductor devices and Ics (ISPSD 95) , Yokohama (Japon), 23-25 mai1995, pp.90-95RW . 4- Lebedev A. A et all. Fabrication and study of 6H- SiC epitaxial difused pn structures. Semiconduct., 1995, vol. 29, n°9, pp. 850-853.

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ISy90 Al-doped- and pristine-ZnO nanoparticle catalysts in water remediation form imidacloprid insecticides by photodegradationunder solar radiation. D. Sedera, A.Zyouda and H. Hilala,+ aChemistry, An-Najah National University, Nablus, Palestine + Author for correspondence: [email protected]

ZnO nanoparticles were modified by doping with Al in different molar percentage. The photocatalytic activity of different systems was studied against imidacloprid insecticide which is highly used in agriculture sector in Palestine. The presence of Al shows no effect on ZnOband gap which has been measured by UV-Vis absorption and luminescence emission spectroscopy. The value is (3.2-3.3 eV). However, the increase of Al content shows depression effect on photocatalytic activity of the catalyst which reaches zero percentage at 10% of Al. The rate of degradation reaction also decreases as Al% increases. The depression in activity and rate were explained by catalyst surface charge, based on zero-point charge measurement for the catalyst systems. At Al% is more than 6%, the zero-point charge value shifts from 7 to 9. The results show that using pristine ZnOnano-particles is advantageous over the Al-doped ones in photodegradation of imidacloprid insecticide in contaminated water. Key words: Water remediation; ZnO nanoparticles; Imidacloprid insecticide; Phtodegradation; Solar radiation

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ISy91 Ag Doping Effects on the Microstructure, Morphology, Optical and Luminescence Properties of Sol-Gel-Deposited ZnO Thin Films M. Atoui a,+, T. Touam b,c, A. Chelouche d, F. Challali,e D. Djouadi,d a Laboratoire de Rayonnement et Plasmas et Physique des Surfaces, Université Kasdi Merbah Ouargla, Ouargla 30000, Algérie b Laboratoire des Semi-conducteurs, Université Badji Mokhtar-Annaba, 23000 Annaba, Algérie c Unité de Recherche en Optique et Photonique, Centre de Développement des Technologies Avancées, Université de Sétif 1 campus El-Bez, 19000 Sétif,, Algérie d Laboratoire de Génie de l’Environnement, Université de Bejaia, 06000 Bejaia, Algérie e Laboratoire des Sciences des Procédés et des Matériaux (LSPM), UPR3407-CNRS, Université Paris 13, Sorbonne Paris Cité, 99-Jean-Baptiste Clément Avenue, Villetaneuse 93430, France

+ Author for correspondence: [email protected]

A sol-gel dip-coating process is used to prepare highly c-axis oriented thin films of zinc oxide (ZnO) on glass substrates. The effects of moderate Ag doping (Ag/Zn<10%) on the microstructure, morphology, optical and luminescence properties of such films are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy, UV-Visible (UV-Vis) spectrophotometry and photoluminescence (PL) spectroscopy. Interesting results were obtained, e.g. XRD analysis shows that all the films possess a polycrystalline wurtzite structure with a c-axis preferential orientation and exhibit a minimum residual stress. The crystallite size values are calculated and found to be about 20– 24 nm. Raman spectra of the films confirm XRD data analysis. SEM micrographs and AFM images show a dense surface with more or less spherical grains uniformly distributed. Moreover, it is found that increasing Ag doping levels leads to a decrease in grain size and surface roughness. According to UV-vis. measurements, the undoped ZnO thin film is highly transparent in the visible region with an average transmittance of about 83%. As the concentration of the doped Ag increases the transmission slightly decreases. Moreover, the direct optical band gap is found to increase with increasing Ag doping concentration. Room temperature PL spectra put into evidence that emission is found to be influenced by Ag content. The UV emission initially increased with increasing Ag doping up to 6 % and then decreased, whereas the intensity of the visible emission decreases with the increase in the Ag concentration from 0 to 3% then increases for higher concentrations. The high quality c-axis orientated Ag doped ZnO thin films with minimum stress and tunable optical properties suggests that these films may have good applications in optoelectronics.

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Keywords: ZnO Thin Films, Sol-Gel, Ag doping, Microstructure and Morphology, Transmittance, Photoluminescence ISy92 Influence of Substrate Type on Physical Properties of Nanostructured TiO2 Thin Films Grown by RF Magnetron Sputtering S. Khodja,a,+ T. Touam,b,c F. Challali,d A. Chelouche,e D. Djouadi,e a Laboratoire de Rayonnement et Plasmas et Physique des Surfaces, Université Kasdi Merbah Ouargla, Ouargla 30000, Algérie b Laboratoire des Semi-conducteurs, Université Badji Mokhtar-Annaba, 23000 Annaba, Algérie c Unité de Recherche en Optique et Photonique, Centre de Développement des Technologies Avancées,Université de Sétif 1 campus El-Bez, 19000 Sétif,, Algérie d Laboratoire des Sciences des Procédés et des Matériaux (LSPM), UPR3407-CNRS, Université Paris 13, Sorbonne Paris Cité, 99-Jean-Baptiste Clément Avenue, Villetaneuse 93430, France e Laboratoire de Génie de l’Environnement, Université de Bejaia, 06000 Bejaia, Algérie

+ Author for correspondence: [email protected]

In this work, anatase titanium dioxide (TiO2) thin films are successfully prepared on three different substrates (glass, quartz and silica-on-silicon (SiO2/Si)) at room temperature with a deposition time of 60 min using RF magnetron sputtering technique. The effect of substrate type on the microstructure, surface topography, transmittance and optical band gap of the

TiO2 thin films is investigated by X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM) and UV-Visible (UV-Vis) spectrophotometry. XRD analysis shows that all thin films are polycrystalline and crystallize only in the tetragonal anatase structure of

TiO2 with a preferential orientation along the (101) plane. The crystallinity, peak intensity and crystallite growth are found to be substrate type dependent. Raman peaks observed around 144, 197, 397, 514, 519 and 640 cm−1 confirm the presence of anatase phase in all samples attributed to Raman active modes with symmetries Eg, Eg , B1g , A1g, B1g and

Eg , respectively. It is also observed from the full width at half-maximum (FWHM) of the most intense anatase peak, located at 144 cm−1, that crystallite size is affected by the substrate type which is in good agreement with XRD data. AFM images reveal that TiO2 thin films exhibit a different surface topography, which seems to be influenced by the substrate type, as expressed in terms of average grain size and surface roughness. Room temperature transmittance spectra measured with respect to air put into evidence that TiO2 films on both the glass and quartz substrates demonstrate high transparency with almost the same average optical transmittance of about 82% in the visible region. Moreover, the values of the direct optical band gap energy (Eg) derived from the transmittance data are 3.61 eV and 3.52 eV for

TiO2 thin films deposited onto glass and quartz substrates, respectively.

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Keywords: TiO2 Thin Films, RF Sputtering, Substrate Type, Microstructure and Topography, Optical Properties ISy93 Encapsulation of different semiconductor and metal nanosized particles in ureasil organic–inorganic hybrid obtained by sol-gel method V. Boeva, V. Ilchevaa, G. Avdeevb, T. Petkovaa a Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Acad. G. Bonchev str. bl.10, 1113 Sofia, Bulgaria bInstitute of Physical Chemistry, BAS, Acad. G. Bonchev str., bl.11, 1113 Sofia, Bulgaria

+ Author for correspondence: [email protected]

In present work we summarized the development of ureasil-based nanocomposites, doped with semiconductor (CdS, PbS) and metal (Au, Ag) nanoparticles. The reliable preservation of the quantum-size and plasmon oscillation effects of semiconductor nanoparticles and in metal nanoparticles embedded in the organic-inorganic hybrids is able to provide a wide range of optical functionalities, that could be utilized for fabrication of flexible diffracting elements, flexible filters with desired absorption profile, elements for non-linear optics and optical storage of information. Also, we report recent experimental results of a hybrid ureasil polymeric matrix in which

TiO2 photocatalytic nanoparticles were immobilized. The prepared samples were characterized by X-ray diffraction (XRD), TGA, FTIR and Scanning Electron Microscopy (SEM). Photocatalytic degradation of modeling pollutant malachite green dye was carried out to study the efficiency of the ТiO2-containing ureasil nanocomposite as a photocatalyst under UV irradiation. The degradation was observed to be influenced not only by the catalytic activity of the particles, but of the intrinsic properties of the matrix itself. Keywords: Ureasil, nanocomposite, photocatalytic nanoparticles

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ISy94 Vibrational study of boron doped single-walled carbon nanotubes A. Elbiyaali a,+, F. Allali b, A. Rahmani b aMSISM Team, Department of Physics, Cadi Ayyad University, Polydisciplinary Faculty of Safi, Sidi Bouzid, BP 4162 Safi, Morocco. b Advanced Material and Applications Laboratory, Moulay Ismaïl University, BP 11201,Zitoune, Meknes,Morocco. + Author for correspondence: [email protected] In this work, we have studied boron doped single wall carbon nanotubes in the framework of the bond-polarization theory. The spectral moment method was used in order to calculate Raman scattering; it is shown that a powerful tool. Raman spectra were fit with six peaks that vary in intensity with B-doping rate. The ratio of the D and G bands integrated intensities scaled linearly with B-doping rate. The results as a function of doping rate dependence and the nanotube diameter are performed. Raman spectroscopy analysis reveals a mathematical expression was derived to describe the dependence of the RBM frequency with diameter and the B-doping rate. Our main results are discussed in the light of the experimental data.

Keywords: Carbon nanotube, Boron, Doping rate, Raman, Spectral moment method

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ISy95 Pyrrolidinium-based polymer electrolytes for supercapacitor applications A. Stoyanovaa+, S. Velevaa, Ch. Novakovb, Ivaylo Dimitrovb, E. Slavchevaa a Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria b Institute of Polymers, Bulgarian Academy of Sciences, Sofia, 1113, Bulgaria + Author for correspondence: [email protected]

Supercapacitors are electrochemical energy storage devices that achieve high power density and fast charge-discharge rates. In a traditional supercapacitor, an ion-permeable and electrically insulating separator film is sandwiched between two electrodes flooded with a liquid electrolyte. Since liquid electrolyte leakage is a severe issue, especially when the material is environmentally hazardous, efforts are focused on replace the liquid electrolytes with solid electrolytes. The polymer electrolytes are ideal candidates for next generation solid supercapacitors, which are not only safer, but also offer high performance, light weight, and flexible forms [1]. A method of polymerization and chemical modification was applied for synthesis of a series of novel pyrrolidinium - containing homo- or copolymers and their turning into polymeric ionic electrolyte. The polymer electrolyte was impregnated the active layer of the activated carbon supercapacitor electrodes and the resulting thin polymer electrolyte layers on both electrode surfaces are integrated into a single thin layer minimizing interfacial resistance. The electrochemical characteristic of the supercapacitor cells were evaluated using galvanostatic charge/discharge tests and cycling voltammetry. The effect of polymer composition and operation temperature on the supercapacitor performances was also studied. The results show that the obtained pyrrolidinium based polymer electrolyte is suitable for application in solid supercapacitors. Further studies are needed to improve their electrochemical performances. Acknowledgments: This work was financially supported by the Bulgarian National Science Fund through KP- 06-OPR 04/5 project and partially by the National Roadmap for Research Infrastructure 2017-2023 “Energy storage and hydrogen energetics (ESHER)”, approved by DCM # 354/29.08.2017 and granted by the Ministry of Education and Science of Republic Bulgaria. . Keywords: polymer electrolyte, supercapacitor, electrochemical tests, biogenic activated carbon

1- H. Gao, K. Lian, RSC Adv. 4, 33091 (2014)

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ISy96 Ac Conductivity and dielectric behavior of cation activated forsterite S. El Asria,b+, H. Ahamdanea, L. Hajjib , M. El Hadria , M. A. El Idrissi Raghnia, and M. Mansoric aLaboratory of Materials Science, Faculty of Sciences Semlalia. B.P. 2390, Marrakech, Morocco bLaboratory of Condensed Matter and Nanostructure, Faculty of Sciences and Technology, Marrakech. Morocco cLaboratory of Materials Chemistry and Environment, Faculty of Sciences and Technology, Marrakech, Morocco + Author for correspondence:[email protected] Several silicates are considered as promising materials for insulation applications due to their low dielectric constant, their low cost and their high abundance [1]. Among the suggested candidates are olivine group [1]. In this context, ac conductivity and dielectric properties of undoped forsterite Mg2SiO4 and M modified forsterite with composition Mg2-xMx SiO4 (M= Co, Mn and Ni; x=0.1) ceramics were investigated. The obtained products were prepared by using sol-gel route and one single phase was obtained for different materials crystallized in Pbnm orthorhombic structure. The results of Microstructure characterizations were correlated with those of electrical impedance spectroscopy results and will be communicated in this presentation. Keywords: Silicates, Dielectric constant, Ac conductivity 1- C. Zhang Zuo, R., Zhang, J., & Y. Wang. Journal of the American Ceramic Society, 98(3), 702-710. (2015). 2-T. Sugiyama, H. Ohsat, T. Tsunooka & K. Kalrimoto, K. Ceramic Engineering and Science Proceedings (Vol. 292, p. 155) (2009).

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ISy97 Deep investigation on the electrical behavior of Al/pSi/ZnTPyP/Au heterojunction for hybrid solar cell applications: A review N. EL Ghyatia, +, R. EL Mozninea, +, M. Mahmoudb; S. Zaim a, M. Chahbi aA. Mortadi a; A. Elmellouky; C. El Ghaoutia aLaboratory Physics of Condensed Matter (LPMC). University Research Center (CUR) in Renewable Energies & Intelligent Systems for Energy "EnR&SIE". Faculty of Sciences, ChouaibDoukkaliUniversity, El-Jadida, Morocco bLaboratory of Engineering Sciences for Energy (LabSIPE). University Research Center (CUR) in Renewable Energies & Intelligent Systems for Energy "EnR&SIE". National School of Applied Sciences, ChouaibDoukkali University, El Jadida – Morocco + Author for correspondence:[email protected] Electrical impedance spectroscopy (EIS) is used in a broad range of applications as a technique to characterize solid, liquid, organic as well as inorganic materials. In the case of solar cells; this technique is widely used to investigate the diffusion and recombination processes and to extract the live time of the charge carriers. Recently; this technique has been used by M.M. Shehata et al [1] to investigate the electrical behavior of the Al/p- Si/ZnTPyP/Au heterojunction for hybrid solar cell application. Complex impedance measurements of the heterojunction were preformed in the frequency range from 100HZ to 2 MHz at applied AC voltage range from 0.2 V to 1 V, temperature range from 303 K to 353 K and under the standard illumination range from 0 to 40mW/cm. An equivalent electrical circuit was used to fit very well the experimental data and to describe the electrical behavior at the interface [1]. The electrical parameters extracted from the equivalent circuit were used to evaluate the time constant of the charge carriers at the interfaces. However, it appears that there is a big difference the values of the time constant of the charge carriers does not correspond to those extracted from the peaks observed in the evolution of the imaginary part (Z‘‘) of complex impedance (Z*) as a function of the angular frequency. Therefore, in the current study a simulation was performed in order to generate the complex impedance data using electrical parameters extracted from the equivalent circuit. A theoretical consideration of the global complex impedance (Z*) and module (M*) of the equivalent circuit were developed. A depth analysis in the evolution impedance complex impedance (Z*) and module (M*) data using both Bode and Nyquist plotswas carried out to investigate and to obtain a more complete view of the different processes that occurred at different interfaces of the hybrid heterojunction. This analysis was very useful for the identification and deconvolution of different diffusion and recombination processes. A good correlation was obtained between the time constant of the charge carriers at the interfaces from the simulated curves and those obtained from the theoretical consideration.This study revealed that the

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analysis of the complex impedance (Z*) combined with the complex modulus (M*) using simultaneously Bode and Nyquist diagram can be considered as the most appropriate way to evaluate the time constant of the charge carriers at the interfaces with more accuratelyas well as to investigate and to identify of the different processes. The present review could provide considerable information for a deep analysis of the electrical properties for others kinds of solar cell. Keywords: Impedance spectroscopy, Solar cell, Al/p-Si/ZnTPyP/Au Hybrid heterojunction; Equivalent circuit.

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ISy98 A simple analysis of complex impedance M. Aljarraha, +, F. Salmanb aDepartment of Industrial Engineering, , Zarqa, Jordan bBanha University Faculty of Science, Egypt. +Author for correspondence: [email protected]

An overview of principles of impedance in materials is studied. Impedance of various circuit elements are calculated and plotted on complex plane and represented with equivalent circuits. The capacitance and resistance have been evaluated from impedance data at the various frequencies to obtain formulas of dielectric constants and ac conductivity. Data of dielectric constants and the ac conductivity are represented. Common impedance and dielectric plots are given.

Keywords: complex impedance, dielectric, conductivity

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ISy99 Thermo physical Properties of Nanofluids: Recent Survey O. Ouaboucha, M.Kriraab, M.Lamsaadia aLaboratory of Flows and Transfers Modelling, Sultan Moulay Slimane University, Faculty of Sciences and Technologies, B.P. 523, Beni-Mellal, Morocco. bLaboratory of Engineering, Industrial Management and Innovation, Faculty of Sciences and Technologies, Hassan 1st University, Settat, Morocco. +Author for correspondence: [email protected] Nanofluids are the new class of thermofluids and also an evolving field of research. Due to their superior thermophysical properties, researchers have been interested in their application in various thermal devices.Researchers believe that the positive effects of the application of these fluids on thermal performance are due to the improvement of their thermal properties, such as thermal conductivity, specific heat, viscosity, etc.The aim of this study is to provide an overview of the thermophysical properties of nanofluids.All these parameters have particular or combined effects on the thermo-physical properties of nanofluids.

Keywords: Nanofluid, Thermal conductivity, Thermal performance, Viscosity, Specific heat.

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ISy100 Devonshire-Ginzburg-Landau phenomenological study of ferroelectric properties of PbTiO3 thin film E. ES-SALHIa+, A. Toumanaria, and D. Khatibb aLaboratory of Condensed Matter Physics and Nanomaterials for Renewable Energy, University Ibn Zohr, 80000, Agadir, Morocco bResearch team of theoretical physics and high energy, University Ibn Zohr, 80000, Agadir, Morocco + Author for correspondence: [email protected]

It is known that the physical properties of thin films are significantly different from those of bulk ferroelectrics. The surface effect is one of this important proprieties observed in ferroelectric thin films; at the surface of the film the coordination of atoms is different from that inside the film. Our work is based on functional coefficients of free energy calculated from microscopically interactions of bulk lead titanate PbTiO3 with order parameter is shift of central ion Ti. The influence of the surface effect on the ferroelectric properties of lead titanate film has been investigated. In this study, based Ginsburg-Landau-Devonshire thermodynamic theory, the shift displacement profile, the average and the maximal shift displacement are numerically modeled and analyzed by an Euler-Lagrange equation with apply a corresponding boundary condition on ions displacement for various film thicknesses and degrees of extrapolation length.

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ISy101 Diamagnetic susceptibility and hydrostatic pressure effects of donors in Si, GaAs and HgS Core/Shell quantum dot + S. Janati Edrissi, I. Zorkani , F. Jabouti F. Benhadou and A. Jorio Group of Nanomaterial and Renewable Energies, Laboratory of Solid State Physics, Faculty of Sciences Dhar Mehraz BP 1796, Fez-Morocco + Author for correspondence: [email protected]

This paper reports a recent study on the diamagnetic susceptibility of a single dopant in Si, GaAs and HgS Core/Shell Quantum Dot. In the framework of the effective mass theory, using a variational technique and an infinite deep potential. The numerical calculations are performed Core/Shell Quantum Dot with Spherical and cylindrical shape and considering the position of the impurity. For small QD the binding energy increases for a given temperature and magnetic field (i), and (ii) increases when the pressure increases. The diamagnetic susceptibility of shallow hydrogenic impurity in this system is calculated as a function of dot size when the static pressure and the magnetic field are applied simultaneously. The Diamagnetic Susceptibility strongly depends on size of the QD and decreases with increasing size of the quantum dot and tends towards the limit of the massif (-1,1 a.u.) (Increase in Diamagnetic Susceptibility in absolute value). Our investigation show that the diamagnetic susceptibility decreases when the hydrostatic pressure increases. The Diamagnetic Susceptibility decrease when the impurity moves from the center to the quantum dot edge. A close comparison for the absolute value of the diamagnetic in Si, GaAs and HgS core/shell Quantum Dot is presented. We find that there is a strong relationship between gap energy and binding energy, the effect of the pressure is more intense in HgS than in Si and GaAs. We also remark that the absolute value of diamagnetic susceptibility in GaAs (large gap

semiconductor, Eg=1,42eV) is lower than in HgS (which is a narrow gap Eg=0,5eV). Keywords: Core/Shell quantum dot, Diamagnetic Susceptibility, Temperature, Pressure effects, Si, HgS, GaAs.

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ISy 103 First-principles investigation of structural, electronic, dynamic and thermodynamic properties of Alkali Halides S.I Messaoudia aFaculté des Sciences et de la Technologie, Université Belhadj Bouchaib, Ain-temouchent, Algeria + Author for correspondence: [email protected]

The paper reports the calculation of the structural, electronic, dynamical and thermodynamic properties of alkali halides LiX (X= F, Cl, Br and I) using the full-potential linear augmented plane-wave [1], and plane wave pseudopotential methods [2]. The obtained structural parameters agree favourably with experimental findings and theoretical data reported in the literature. Total energy calculations of the rock-salt and Cesium chloride phases are investigated. The NaCl structure is found to be the ground states phase of LiX. The Bands gaps calculated by the GGA approximation are underestimated compared to the experimental. The gap values obtained using the modified Becke-Johnson (mBJ) [3] exchange potential are in excellent agreement with the gap values obtained by the GW method as well as experimental measurements. The dynamical properties of Li-based alkali halides are also analysed and discussed. Keywords: First-principles, High pressure, alkali halides, phonons, thermodynamics

1- D. Singh, Phys. Rev. B 43, 6388 (1991). 2- J. C. Phillips, Phys. Rev. 112, 685 (1958). 3- F. Tran and P. Blaha, Phys. Rev. Lett. 102, 226401 (2009).

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ISy 104 Transition metal complexes of 1,2,5-benzoselenadiazole: synthesis and dielectric properties H. Ouahinea,+, N. Abdallaha, Y. Hadouchb, M. Ait Alia, L. El firdoussia a Equipe de Chimie de Coordination et Catalyse, Université Cadi Ayyad, Faculté des Sciences Semlalia, BP 2390, Marrakech,Morocco. b Laboratoire de la Matière Condensée et Nanostructures, Université Cadi Ayyad, Faculté des Sciences et Techniques, BP 2390, Marrakech,Morocco. + Author for correspondence: [email protected]

Organic compounds containing selenium continue to attract the interest of scientists because of numerous potential applications in organic synthesis [1], biochemistry [2], xerography [3] and catalysis [4]. In particular, 1,2,5-selenadiazolyl heterocycles compounds have gained significant progress due to their fascinating characteristics such as conductivity [5] and magnetic effects, i.e., bulk ferromagnetism [6] and spin-canted anti-ferromagnetism [7]. Furthermore, the coordination ability of heteroatoms and the strong electron-donating ability of selenium have led to the preparation of diverse transition metal complexes of 1,2,5- selenadiazolyl heterocycles [3,8]. The reaction of 1,2,5-benzoselenadiazoles with various metal ions has resulted in unique organo-selenium transition metal complexes which in turn have been explored as catalysts in different organic transformations. However, to the best of our knowledge, no research group was engaged in the study of the dielectric properties of such materials. Thus, we report here an exclusive study of the dielectric properties of 1,2,5-benzoselenadiazoles transition metal complexes. Keywords: Metal transition, Complexes, Benzoselenadiazole, Dielectric properties.

1- KK.Casola, D.F.Back, G.Zeni, J.Org.Chem. 80,7702 (2015) 2- A.Kumar, G.K.Rao, F.Saleem, A.K.singh, Dalton trans. 41, 11949 (2012) 3- S.B, Berger, Phosphorus Sulfur. 38, 375 (1988) 4- I.P.Beletskaya, V.P.Ananikov, chem. Rev. 111, 1596 (2011) 5- JL.Brusso, K.Cvrkalj, AA.Leitch, RT Oakley, RW. Reed, CM. Ertson. J.Am.Chem.Soc. 128, 150 (2006) 6- AA.Leitch, JL.Brusso, K.Cvrkalj, RW.Reed, CM.Robertson, PA.Dube, RT.Oakeley. Chem commun.32,3368(2007) 7- CM.Robertson, DJT.Myles, RW.Reed, BM.Dooley, NL.Frank, PA.Dube, LK. Thompson, RT. Oakley. J.Am.Chem.Soc. 129, 12688 (2007) 8- P.Singh, S.Sharma, H.B.Singh, RT.Butcher. A. Phys. Sci. 84, 269 (2014)

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ISy 105 Exploitation of thermoluminescence (TL) spectra for determining some physical parameters. Application to TL spectra of alumina -Al2O3 Z. Youcefi,a M. Ghamnia,a and C. Fauquetc a LSMC Laboratory, , 311000, Oran, Algeria b CINaM Center, Aix-Marseille University, 13288 MARSEILLE Cedex 09, France

+ Author for correspondence: [email protected]

Thermoluminescence (TL) often called thermally stimulated luminescence TSL, is the phenomenon of light emission observed only on non-metallic materials and mainly on crystallized ionic compounds, especially on insulator materials. Thermoluminescence is closely linked to the presence of point defects which are native defects intrinsic to the crystal or impurity atoms. The presence of theses defects disturb the crystal periodicity of the lattice and causes the appearance of energy levels in the bandgap. In a previous work, we studied the

-Al2O3 -Al2O3 is a crystal known by its point defects related to oxygen vacancies called F and F+ colored centers and also by the presence of chromium impurity (Cr3+). Under ionizing radiation of the material, electrons may transit from the valence band into the conduction band leaving holes in the valence band. During irradiation, an amount of energy related to trapped electrons/holes is stored in the crystal. This energy is released by photon emissions when we provid thermal energy to the crystal. The intensity of photon emission is depending on several parameters such as the concentration n of the trapped electrons, the energy activation E, the temperature T, the frequency factor s, the kinetic order b, ... The aim of this work is to study the influence of these parameters on the TL curves obtained from the phenomenological models and to deduce them from experimental TL spectra of alumina (-Al2O3)

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ISy 106

Study of Field Emission Differences between Carbon Black Particles and Several Types of Carbon Nanotubes, Both Embedded in Glass TubesMarwan S. Mousa1*, Samer I. Daradkeh1, Hatem A. Al-Braikat1, Ala’a M. Al-Qudah1, M-Ali H. Al-Akhras2

1Surface Physics and Materials Technology Lab, Department of Physics, Mu'tah University, AL-Karak, Jordan.

2Department of Physics, Jordan University of Science and Technology, Irbid, Jordan.

*Corresponding Author: Marwan S. Mousa, 00962795659761, [email protected]

Carbon based nanomaterials have much attention for tens of years, due to their unique structure and properties such as high electrical and thermal conductivity, chemical stability, high aspect ratio, and small size. This would make them a perfect candidate to be used in modern scientific and industrial fields. We studied here the Field Electron (FE) Emission properties of such materials using I-V characteristics and Fowler-Nordheim (FN) Plots. We investigated the properties of four types of carbon based nanomaterials; the Single-Walled Carbon Nanotubes (SWCNTs) which were produced by high-pressure carbon monoxide process over Fe particles, Multi-Walled Carbon Nanotubes (MWCNTs) NanoclyTM NC 7000 of carbon purity (90%), Carbon Nanotube Fiber (CNTFs) Ⅲ PR-1, and Carbon Black (CB) Vulcan XC72. Field emission tips were manufactured by employing a drawing glass technique, then the CN material was inserted inside the glass tips till protruding from their broken end. Those tips were characterized in FE microscopes under UHV conditions with tips (Cathode) ~ screen (Anode) separation of ~ 10 mm. Results obtained from CB material showed agreement with the linearity of the FN plots, while other types showed agreement at low applied voltages. The emission images showed single spot shape at low voltages for (SWCNTs) and (CNTFs), while obtained at higher voltages for the (CB) and (MWCNTs).

Keywords: Field emission, Single-Walled Carbon Nanotubes, Carbon Black, Fowler-Nordheim, Multi-Walled Carbon Nanotubes, Carbon Nano-fibers.

1. Marwan S. Mousa, IOP Conf. Ser.: Mat Sci & Eng, 305, 012025 (2018), Doi:10.1088/1757-899X/305/1/012025

2. M. S Mousa, M-Ali H. Akhras, S.I. Daradkeh, Jo. J. Phys., 11, 1, 17-25 (2018)

ISy 107

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Properties of Tungsten – Polyethylene Composite Material as a Modified Source of Electron Emission

Nezar Abu Nijim1, Moneeb Shatnawi1, Mohammad M. Allaham2 and

Marwan S. Mousa2,+

1: Department of Physics, The University of Jordan, Amman, Jordan.

2: Department of Physics, Mu'tah University, Al-Karak 61710, Jordan.

*Corresponding Author: Marwan S. Mousa, 00962795659761, [email protected]

The objective of objective of this work is to study modifications that occur to the properties of the electron emission mechanism from tungsten emitters with various tip radii [1 – 3]. The emitters are etched from pure tungsten 0.1 mm wires and have been coated by layer of variable thicknesses of polyethylene [4]. For this purpose, a number of tungsten tips with various apex radii have been prepared using electrochemical etching techniques that has been characterized before and after coating. The measurements obtained during the experiments include the current – voltage (I – V) characteristics, Fowler – Nordheim (퐹 – 푁) [5] and Murphy – Good plots (M – G) [6], scanning electron microscope images for the emitters apex before and after coating with the polyethylene layers. Additionally, the spacial distributions have been also recorded using from the field emission microscope. The results obtained from the experiments are tested using the field emission orthodoxy test [7, 8].

Keywords: Field electron emitter, polyethylene Dielectric layer, Composite emitter, Field electron microscope, Scanning electron microscope, Murphy – Good plots, Fowler – Nordheim plots.

References

1. R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys., 19, 699 (1986).

2. M. S. Mousa, Surf. Sci. 94/95, 129 (1996).

3. M. S. Mousa., Surf. Interface Anal., 39, 102 (2007).

4. M. Husain, G. R. Davies, I. M. Ward, Polymer, 42 (8), 3679 (2001).

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5. R. G. Forbes, J. H. B. Deane, A. Fischer and M. S. Mousa, Jo. J. Phys. 8, 125 (2015).

6. R.G. Forbes, Proc. R. Soc. Open Sci. 6, 190912 (2019).

7. R. G. Forbes, Proc. R. Soc. Open Sci. 469, 20133027 (2013).

8. M.M. Allaham, R.G. Forbes, M.S. Mousa M.S., Jordan J. Phys. (in press, 2020)

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ISy 108

Influence of Polystyrene layer on the Performance of Field Electron Emission from Nano-Apex Carbon Fiber Emitters

Saleh H. Fawaeer1, Moneeb Shatnawi1, Mohammad M. Allaham2 and Marwan S. Mousa2

1: Department of Physics, The University of Jordan, Amman, Jordan.

2: Department of Physics, Mu'tah University, Al-Karak 61710, Jordan.

*Corresponding Author: Marwan S. Mousa, 00962795659761, [email protected]

This research deals with the process of field electron emission from the surface of carbon fibers before [1 – 5] and after coating with polystyrene insulating layer [6] under high vacuum conditions. Polyacrylonitrile carbon fibers of type VPR – 19, thermally treated at 2800°C were used in this work. This investigation includes the current-voltage (퐼 – 푉) characteristics, Fowler – Nordheim (퐹 – 푁) and Murphy – Good (푀−퐺) plots [7, 8]. Scanning electron micrographs have been obtained in addition to the field electron emission patterns has been recorded. Comparison between the emission process obtained from clean and composite emitters is reported. Significant improvement on the characteristics recorded from the emitters after being coated is observed.

Keywords: field electron emission, Fowler – Nordheim plots, Murphy – Good plots, carbon fiber field emission cathode, polystyrene insulating layer, composite cathodes.

References

1. R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys. 19, 699 (1986).

2. M. S. Mousa, Surf. Sci. 94/95, 129 (1996).

3. M. S. Mousa, T. F. Kelly, Ultramicroscopy 95, 125 (2003).

4. V. S. Baker, A. R. Osborne, J. Williams, J. Phys. D: Appl. Phys. 7, 2105 (1974).

5. A. M. Almasri, M. J. Hagmann, M. S. Mousa, Applied Microscopy, 47 (1), 55 (2017).

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6. S. Parveen, A. Kumar, S. Husain and M. Husain, Phys. B Cond. Mat. 505 (2017).

7. R. G. Forbes, J. H. Deane, A. Fischer, Jo. J. Phys. 8, 125 (2015).

8. R.G. Forbes, Proc. R. Soc. Open Sci. 6, 190912 (2019).

ISy 109

Using Polystyrene Nano layers as a Coating Material for Field Electron Emission metallic and semiconducting Cathodes

Marwan S. Mousa

Surface Physics and Materials Technology lab, Dept. of Physics, Mutah University, Al-Karak 61710, Jordan

[email protected]

This study is about using an insulator layer of Polystyrene as a coating material for Tungsten (W) and Carbon Fiber (CF) tips in field electron emission (FEE) from single field emitters experiments. The base sample tip were prepared using the electrochemical etching process [1] and then being carefully vertically dipped [2] into a solution of Polystyrene – Toluene in order to create the coated samples.

The coated Tungsten and Carbon Fiber tips were then installed in the locally built field emission microscope (FEM) under high vacuum (HV) conditions [3]. The current – voltage (I – V) characteristics were recorded and then analyzed using the Fowler – Nordheim (FN) and Murphy – Good (MG) plots. The study also includes studying the tip profile using the scanning electron microscope (SEM) and the field emission microscope to record the pattern images. The changes that occur, before and after the coating process, has been studied and comparison of the results has been carried out.

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Using Polystyrene, as a coating material, showed significant improvement in the recorded emission current values and the threshold applied voltage, for both Tungsten and Carbon Fiber samples. Improvement has been more significant for the coated W-core material

References

1. R. V. Latham, M. S. Mousa, J. Phys. D: Appl. Phys., 19, 699 (1986).

2. M. S. Mousa, Surf. Sci. 94/95, 129 (1996).

3. M. S. Mousa., Surf. Interface Anal., 39, 102 (2007).

Study of Field Emission Differences between Carbon Black Particles and Several Types of Carbon Nanotubes, Both Embedded in Glass Tubes

Marwan S. Mousa1*, Samer I. Daradkeh1, Hatem A. Al-Braikat1, Ala’a M. Al-Qudah1, M-Ali H. Al- Akhras2

1Surface Physics and Materials Technology Lab, Department of Physics, Mu'tah University, AL-Karak, Jordan.

2Department of Physics, Jordan University of Science and Technology, Irbid, Jordan.

*Corresponding Author: Marwan S. Mousa, 00962795659761, [email protected]

Carbon based nanomaterials have much attention for tens of years, due to their unique structure and properties such as high electrical and thermal conductivity, chemical stability, high aspect ratio, and small size. This would make them a perfect candidate to be used in modern scientific and industrial fields.

We studied here the Field Electron (FE) Emission properties of such materials using I-V characteristics and Fowler-Nordheim (FN) Plots. We investigated the properties of four types of carbon based nanomaterials; the Single-Walled Carbon Nanotubes (SWCNTs) which were produced by high-pressure carbon monoxide process over Fe particles, Multi-Walled Carbon Nanotubes

(MWCNTs) NanoclyTM NC 7000 of carbon purity (90%), Carbon Nanotube Fiber (CNTFs) Ⅲ PR-1, and Carbon Black (CB) Vulcan XC72. Field emission tips were manufactured by employing a

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drawing glass technique, then the CN material was inserted inside the glass tips till protruding from their broken end. Those tips were characterized in FE microscopes under UHV conditions with tips

(Cathode) ~ screen (Anode) separation of ~ 10 mm. Results obtained from CB material showed agreement with the linearity of the FN plots, while other types showed agreement at low applied voltages. The emission images showed single spot shape at low voltages for (SWCNTs) and (CNTFs), while obtained at higher voltages for the (CB) and (MWCNTs).

Keywords: Field emission, Single-Walled Carbon Nanotubes, Carbon Black, Fowler-

Nordheim, Multi-Walled Carbon Nanotubes, Carbon Nano-fibers.

References

1. Marwan S. Mousa, IOP Conf. Ser.: Mat Sci & Eng, 305, 012025 (2018), Doi:10.1088/1757- 899X/305/1/012025 2. M. S Mousa, M-Ali H. Akhras, S.I. Daradkeh, Jo. J. Phys., 11, 1, 17-25 (2018)

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ISyDMA’5 Participants

Name Country Ref. 1 ABBADI H. MOROCCO ISY35 2 ABDELBAKI A. MOROCCO PP15, PP16, PP30 3 ABDERRAHMANE S. H. ALGERIA ISY57 4 ABLOUH E. MOROCCO ISY85 5 ABOUELFIDA A. MOROCCO PP61 6 ABOULOULA C. N. MOROCCO PP60, PP46 7 ABOU-SALAMA M. MOROCCO PP3, PP4 8 ABU NIJIM N. JORDAN ISY3 9 ACHEHBOUNE M. MOROCCO PP42, PP43 TALK25, PP31, PP7, PP29, PP34, PP36, PP37, 10 ACHOUR M.E. MOROCCO PP38, PP46, PP47, PP63 11 AFQIR M. MOROCCO PP35 12 AGDAD A. MOROCCO PP35, PP62, PP2 13 AGGOUR M. MOROCCO PP2 14 AGOSTIANO A. ITALY TALK19, TALK20 15 AIT ALI M. MOROCCO PP22, PP35 16 AIT BIAD N. MOROCCO TALK17 17 AIT HAMMOU B. MOROCCO PP39, PP13 18 AIT LHAJ D. MOROCCO PP59 19 AITDADS H. MOROCCO PP35 20 AKTAS B. TURKEY TALK8 21 AL ARMOUZI N. MOROCCO PP52 22 AL OMRAN T. IRAQ ISY14 23 AL SOUD A. JORDAN PP57 24 ALABTH M. JORDAN PP54 25 ALBRAIKAT A.H. JORDAN PP53 26 AL-HATTAB M. MOROCCO PP41, PP44 27 ALJARRAH M. JORDAN ISY98 28 ALLAHAM M.M. JORDAN PP53, PP54, PP56 29 AL-OMARI AL-AKHRAS M.A. JORDANIE PP53, ISY1, ISY20 30 ALONTSEVA D. KAZAKHSTAN TALK4 31 ALSHHEAMAT H. JORDANIE ISY19 32 AL-SOUD Y. Y. JORDANIE ISY65 33 ALTINTAS S.P. ALGERIA PP27 34 AMEUR K. ALGERIA PP6, PP12 35 AMJOUD M. MOROCCO PP40 36 AMOUNAS S. MOROCCO PP9 37 ANDRIY G. FINLAND TALK17 38 ANSON-CASAOS A. SPAIN PP37

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39 AOUATI R. ALGERIA PP24 40 AREZKI A. ALGERIA ISY21 41 ARIBOU Z. MOROCCO PP5, PP21 42 ARIBOU N. MOROCCO PP34 43 ATOUI M. ALGERIA ISY91 44 AVANESYAN V. RUSSIA ISY18, ISY82 45 AZAGAR K. MOROCCO PP16 46 BAJJOU O. MOROCCO PP50 47 BARNOSS S. MOROCCO PP34, PP38 48 BARZINJY A. A. IRAQ TALK 12 49 BELAKHMIMA R.A. MOROCCO PP21 50 BELAL I. ALGERIA PP27 51 BELFKIRA A. MOROCCO PP7, PP63 52 BELHIMRIA R. MOROCCO PP36, PP37 53 BELHOUCHET M. TUNISIA ISY46 54 BELKACEMI B. ALGERIA PP12 55 BELKHADIR S. MOROCCO PP40 56 BEN MOUMEN S. MOROCCO PP40 57 BENAMARA Z. ALGERIA PP6, PP12 58 BENDAAHOU A. MOROCCO PP3, PP4, ISY13 59 BENDJEBBOUR M. ALGERIA TALK 23 60 BENLALLI A. ALGERIA PP26 61 BENLATTAR M. MOROCCO PP48 62 BENSEDDIK N. ALGERIA PP6 , PP12 63 BENYAHYA N. ALGERIA PP6, PP12, 64 BENYETTOU N. ALGERIA ISY43 65 BERKANE A. ALGERIA ISY87 66 BIH L. MOROCCO PP51 67 BIN AGAM M. A. MALAYSIA ISY6 68 BOEV V. BULGARIA PP25, ISY93 69 BOLL T. GERMANY PP57 70 BOUABELOU A. ALGERIA PP24 71 BOUAZZA S. MOROCCO ISY71 72 BOUCHAIB J.M. MOROCCO PP30 73 BOUDIAR A. ALGERIA ISY11 74 BOUGHAROUAT A. ALGERIA PP23 75 BOUHAFS B. ALGERIA TALK23 76 BOUHAFS M. ALGERIA TALK23 77 BOUKABRINE F. ALGERIA PP12 78 BOUKENDIL M. MOROCCO PP11, PP15, PP16, PP18, PP30 79 BOUKHEIR S. MOROCCO PP36, PP37, PP64 80 BOUKHOUBZA I. MOROCCO PP42, PP43 81 BOUKNAITIR I. MOROCCO PP31, PP46, PP63 82 BOUKSILA F.Z. TUNISIA ISY67 83 BOULMELH S. H. ALGERIA ISY54

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84 BOULMERKA R. ALGERIA ISY58 85 BOULOUFA A. ALGERIA ISY70 86 BOUMESDJED A. ALGERIA PP6, PP12 87 BOURAGBA F.Z. MOROCCO ISY38, ISY39 88 BRI S. MOROCCO TALK13 89 BROUILLETTE F. CANADA PP60 90 CARLESCU A. ROMANIA PP43 91 CARRU J.C. FRANCE TALK7 92 CHAIB H. MOROCCO PP9, PP59 93 CHAOUKI I. MOROCCO PP5, PP21 94 CHARQUI Z. MOROCCO PP11, PP18 95 CHAYNANE R. MOROCCO TALK 13 96 CHBIHI A. MOROCCO PP64 97 CHEIKH M. MOROCCO PP2 98 CHERIFI A. ALGERIA TALK 23 99 CHERKAOUI M. MOROCCO PP1 100 CHIKH-AFIR H. ALGERIA ISY22 101 CHO Y. JAPAN TALK 2 102 CHOURTI K. MOROCCO PP3, PP4 103 CHRAFIH Y. MOROCCO PP50 104 CIOBANU M. MOLDOVA TALK28 105 COMPARELLI R. ITALY TALK20 TALK25, TALK26, PP29, PP31, PP34, PP36, 106 COSTA L.C. PORTUGAL PP37, PP46, PP47, PP63, 107 CURRI L.C. ITALY TALK19, TALK20 108 POPOV C. GERMANY TALK16 109 DA COSTA A.DA. FRANCE TALK 7 110 DAGDAG O. MOROCCO PP10 111 DAGE S. FINLAND TALK17 112 DAHAMNI M.A. ALGERIA ISY75 113 DARWISH A. EGYPT TALK27 114 DEPALO N. ITALY TALK20 115 DESFEUX R. FRANCE TALK 7 116 DIBENEDETTO CN ITALY TALK19 117 DIKHTYAR Y. Y. RUSSIA ISY26 118 DIMITROVA M. BULGARIA PP25 119 DJAABOUBE H. ALGERIA PP24 120 DJAILI S. H. ALGERIA ISY59 121 DJELTI F. ALGERIA PP58 122 DLIMI S. MOROCCO PP13, PP33, PP39 123 DOROFTEI C. ROMANIA PP43 124 ÉBER N. HUNGARY PP36 125 EBN TOUHAMI M. MOROCCO PP5, PP10, PP21 126 ECHCHELH A. MOROCCO PP13, PP39 127 EHLALI S. MOROCCO TALK18

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128 EL AAKIB H. MOROCCO PP2, PP62 129 EL ABBASSI A. MOROCCO TALK 13 130 EL ASRI S. MOROCCO ISY96 131 EL BACHIRI A. MOROCCO PP10 132 EL BARKANY S. MOROCCO PP3 133 EL BOUARI A. MOROCCO PP51 134 EL FAZAZI A. MOROCCO PP1 135 EL FIRDOUSSI L. MOROCCO PP22, PP35 136 EL GANA L. MOROCCO PP10 137 EL GHYATI N. MOROCCO ISY97 138 EL GOURI M. MOROCCO PP10 139 EL HACHMI A. MOROCCO ISY16 140 EL HAFIANE Y. MOROCCO PP4 141 EL HARFI A. MOROCCO PP10 TALK25, PP7, PP31, PP34, PP36, PP37, PP38, 142 EL HASNAOUI M. MOROCCO PP47, PP63 143 EL HASNAOUI Y. MOROCCO PP32 144 EL KAAOUACHI A. MOROCCO PP13, PP33, 145 EL KAAOUACHI B. MOROCCO PP39 146 EL KISSANI A. MOROCCO PP55, PP59 147 EL MABROUKI M. MOROCCO PP61 148 EL MADANI A. MOROCCO PP20 149 EL MANSOURI A. MOROCCO PP10 150 EL MOUTAOUAKIL L. MOROCCO PP11, PP15, PP16, PP18, PP30 151 EL MOZNINE R. MOROCCO PP28 152 EL OUJDI A. MOROCCO PP39 153 EL-ANSARY Z. MOROCCO PP31 154 ELBIYAALI A. MOROCCO ISY94 155 ELHARFI A. MOROCCO PP47 156 ELHATIMI W. MOROCCO ISY42 157 ELYAAGOUBI M. MOROCCO PP61 158 ELYOUSSFI A. MOROCCO ISY68 159 ESCOBAR CASTILLO M. GERMANY ISY41 160 ES-SALHI E. MOROCCO ISY100

161 FAHMI A. MOROCCO PP14 162 FAHOUME M. MOROCCO PP20 163 FAKHFAKH S. TUNISIA PP17 164 FANIZZA E. ITALY TALK19, TALK20 165 FASLA LOUHIBI S. H. ALGERIA ISY23 166 FASQUELLE D. FRANCE TALK 7 167 FATHY S. EGYPT TALK14 168 FATTOUM A. TUNISIA PP29 169 FAWAEER S. H. JORDAN PP56 170 FEDDI E. MOROCCO PP49 171 FELGEN N. GERMANY TALK16

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172 FINI P. ITALY PP31 173 FKHAR L. MOROCCO PP22 174 FLORIC RAKOTONARIVOA E. MOROCCO PP60 175 FRECHERO M.A. ARGENTINA TALK30 176 GAGOU Y. FRANCE PP40 177 GALAI M. MOROCCO PP5 178 GHAMNIA M. ALGERIA ISY25 179 GONZALEZ-DOMINGUEZ J.M. SPAIN PP37 180 GRACA M.P.F PORTUGAL TALK26, TALK29, PP29, PP38 181 HADOUCH Y. MOROCCO PP22 182 HAILY E. MOROCCO PP51 183 HAMMAMI H. TUNISIA PP17 184 HAMOUDA M. ALGERIA ISY33 185 HAROUZ R. ALGERIA ISY44 186 HASNAOUI A. MOROCCO PP22 187 HEIRECHE L. ALGERIA ISY84 188 HEUPEL J. GERMANY TALK16 189 HEZAM A. TURKEY TALK 3 190 HIDKI R. MOROCCO PP15 191 HIKMAT S. H. S. PALESTINE TAK 5, PP52 192 HNAWI S.K. MOROCCO PP2, PP22, PP35 193 HSISSOU R. MOROCCO PP47 194 HWANG Y. Y. KOREA ISY79 195 IDOUHLI R. MOROCCO PP61 196 IHYADN A. MOROCCO ISY36, ISY37 197 ILCHEVA V. BULGARIA PP25 198 INGROSSO ITALY TALK19, TALK20 199 JALAL A. MOROCCO PP48 200 JANATI EDRISSI S. MOROCCO ISY101 201 JBARA O. FRANCE PP17 202 JEBBOR N. MOROCCO TALK 13

203 JORIO A. MOROCCO PP42, PP43 205 JOUAITI A. MOROCCO PP8 206 KAHOUL F.Z. ALGERIA ISY49 207 KALLEL A. TUNISIA TALK 9, PP17 208 KAMANINA N. RUSSIA TALK22 209 KARADOGAN B. TURKEY TALK 3 210 KARAM M. MOROCCO PP14 211 KARROUA M. MOROCCO PP4 212 KHADIRI M. MOROCCO ISY86 213 KHADIRI M. MOROCCO PP61 214 KHAMMOU N. MOROCCO PP5 215 KHARDAZI S. MOROCCO PP40 216 KHEMMOU N. MOROCCO PP21

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217 KHENFOUCH M. SOUTH AFRICA TALK21, PP50, PP41, PP43, PP44, PP49 218 KHERIS S. H. ALGERIA ISY12 219 KHNEFOUCH M. SOUTH AFRICA PP42 220 KHODJA S. ALGERIA ISY92 221 KHOUAJA A. CANADA ISY32 222 KISLYUK A. RUSSIA ISY55 223 KNAPEK A. GERMANY PP57 224 KOBOR D. SENEGAL ISY10 225 KOLESNIKOVA T. KAZAKHSTAN TALK 4 226 KRASAVIN A. KAZAKHSTAN TALK 4 227 KREIT L. MOROCCO PP7, PP31, PP63 228 KUBASOV I. RUSSIA ISY51 229 KYSLYTSIA O. UKRAINE TALK 4 230 LAALLAM L. MOROCCO PP8 231 LABCHIR N. FRANCE ISY47 232 LAHKALE R. MOROCCO ISY45 233 LAKHOUIL S. MOROCCO PP64 234 LAKRIKH S. H. MOROCCO ISY17 235 LARGUECH S. TUNISIA TALK 9, PP7 236 LASLADJ M. ALGERIA ISY77 237 LEBLANC R.M. USA TALK 1 238 LEFTEROVA E. BULGARIA PP25 239 LEN A. HUNGARY PP36, PP37 240 LEONTIE L. ROMANIA PP43 241 LHARCH M. MOROCCO PP20 242 LIMOUNY L. MOROCCO PP33 243 LOUKIL A. ALGERIA ISY66 244 LOUTOU M. MOROCCO PP3 245 M’ZERD S. MOROCCO PP49 246 MABROUKI M. MOROCCO PP52 247 MAHAMDIOUA N. ALGERIA PP27 248 MAHDADI R. ALGERIA ISY69 249 MAMMERI A. ALGERIA ISY29 250 MANOUN B. MOROCCO PP51 251 MARCHET P. FRANCE PP3, PP4 252 MATAL A. MOROCCO PP64 253 MAZARI H. ALGERIA PP6, PP12 254 MAZRI T. MOROCCO PP32 255 MAZROUI M. MOROCCO PP48 256 MEDJNOUN K. FRANCE ISY28 257 MEDKOUR M. MOROCCO ISY76 258 MELLALOU A. MOROCCO PP2 259 MELO B.M.G. PORTUGAL PP29, PP38 260 MERICHE F. ALGERIA PP27 261 MEROUANI A. ALGERIA ISY27

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262 MESSAOUDI S.I. ALGERIA ISY103 263 MEZDOUR D. ALGERIA PP19 264 MEZZANE D. MOROCCO PP22, PP40 265 MOSTAFA M. EGYPT ISY56 266 MOTHUDI B.M. SOUTH AFRICA PP42, PP43 267 MOUDOU L. MOROCCO PP41, PP44 268 MOUHIB H. MOROCCO ISY48 269 TALK15, PP53, PP54, PP56, PP57, ISY106, MOUSA M.S. JORDAN ISY108, 270 MOUSSA M. EGYPT TALK27 271 NAAMANE S. MOROCCO PP64 272 NAFIDI A. MOROCCO PP9 273 NAGARBAWADI M. INDIA ISY9, ISY61 274 NAJIH Y. Y. MOROCCO ISY88 275 NARJIS A. MOROCCO PP55, PP60, ISY81 276 NASSAR H. PALESTINE ISY72 277 NAYAD A. MOROCCO PP22, PP35 278 NEDJAR M. ALGERIA ISY30, ISY31, ISY63 279 NIOUA Y. MOROCCO PP29, PP34 280 NKHAILI L. MOROCCO PP35, PP55, PP60, ISY24, ISY83 281 NMILA R. MOROCCO PP28 282 ODAGAWA H. JAPAN TALK 11 283 OKUTAN M. TURKEY TALK 3 284 OUABOUCH O. MOROCCO ISY99 285 OUAHINE H. MOROCCO ISY104 286 OUAKKI M. MOROCCO PP1, PP5 287 OUALIM E.M. MOROCCO PP48 288 OUBOUCHOU H. ALGERIA ISY60 289 OUERIAGLI A. MOROCCO PP35, PP36, PP46, PP55, PP59, PP60 290 OULD-ABBAS A. ALGERIA PP58 291 TALK 7, TALK31, PP2, PP10, PP55, PP59, PP61, OUTZOURHIT A. MOROCCO PP62 292 PANNIELLO A. ITALY TALK19, TALK20, PP31 293 PARK S. H. COREE ISY40 294 PETKOV P. BULGARIA ISY8 295 PETKOVA T. BULGARIA PP25, ISY7 296 PIERSON J.F. FRANCE PP62 297 PREZAS P.R. PORTUGAL PP29 298 PROKHORENKOVA N. KAZAKHSTAN TALK 4 299 QACHAOU A. MOROCCO PP14, PP20 300 RABAA H. MOROCCO TALK17 301 RACHEDI SAMIA K. ALGERIA ISY89 302 RAHMANI K. MOROCCO PP41, PP44, PP50 303 RAIDOU A. MOROCCO PP20 304 RAMACHANDRAN M. INDIA TALK 9

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305 RAPHAEL EZE N. NIGERIA ISY15 306 RBIHI S. MOROCCO PP8 307 RCHID H. MOROCCO PP28 308 REITHMAIER J.P. GERMANY TALK16 309 RIZZI F. ITALY TALK20 310 ROCHDI N. MOROCCO PP62 311 SAADOUNE I. MOROCCO TALK24 312 SACI H. ALGERIA ISY78 313 SALES A.J. PORTUGAL TALK26 314 SALMAN S. TURKEY TALK 8 315 SAMIR Z. MOROCCO PP36, PP37 316 SAN S. E. TURKEY TALK 3 317 SAYAH A. MOROCCO TALK18 318 SBIAAI K. MOROCCO PP9 319 SCHMIDT A. GERMANY TALK16 320 SEBSADJI S.K. ALGERIA ISY62 321 SEDER D. PALESTINE ISY90 322 SETTI N. MOROCCO ISY5 324 SHAKHATREH M. JORDAN ISY73 325 SHATNAWI M. JORDAN PP54, PP56 326 SORETO TEIXEIRA S. PORTUGAL TALK26, PP31, PP37, PP47 327 SOYLU N. ALGERIA PP27 328 STOYANOVA A. BULGARIA ISY95 329 STRICCOLI M. ITALY TALK19, TALK20, PP31 330 TABELLOUT M. FRANCE PP19 331 TACHAFINE A. FRANCE TALK 7 332 TAKTAK S. TUNISIA PP17 333 TAMOUM M. ALGERIA PP6 334 TAOUFIK A. MOROCCO PP47 335 TCHENKA A. MOROCCO PP2, PP62 336 TEKELI S. TURKEY TALK 8 337 TELFAH M. JORDAN ISY74 338 TEMIROV A. RUSSIA ISY52 339 TERZIOGLU C. ALGERIA PP27 340 TRABULO MARCIEL A. PORTUGAL ISY5 341 TRIKI A. TUNISIA TALK 9, PP7 342 TSIULYANU D. MOLDOVA TALK28 343 TURKY G. EGYPT TALK27 344 TURUTIN A. RUSSIA ISY53 345 VASEASHTA A. USA TALK 10 346 VISCHIO L.C. ITALY TALK20 347 VOINAROVYCH S. UKRAINE TALK 4 348 YOUCEFI Z. ALGERIA ISY105 349 YOUSFI S. MOROCCO PP51 350 ZAIM S. MOROCCO PP28

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351 ZAKIR O. MOROCCO ISY80 352 ZDANOWSKA-FRACZEK M. POLAND TALK 6 353 ZORKANI I. MOROCCO PP42, PP43, PP49, PP50 354 ZRIKEM Z. MOROCCO PP11, PP15, PP16, PP18 355 ZYANE A. MOROCCO PP7, PP63 356 ZYOUD A. PALESTINE TAK 5

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