Materials Science and Applied Chemistry 2019 PROGRAMME AND ABSTRACT BOOK Riga, Latvia 24 October, 2019 http://msac.rtu.lv/ MATERIALS SCIENCE AND APPLIED CHEMISTRY Thursday, 3/7 P. Valdena Street, Riga Technical University 60th International PROGRAMME October 24 Room 272; 445; 337 Scientific Conference SECTION CHAIR V. KAMPARS, Dr. habil. chem., Riga Technical University, Latvia MĀRIS TURKS, prof., Riga Technical University, Latvia J. BLŪMS, Dr.phys., Riga Technical University, Latvia SCIENTIFIC COMMITTEE D. BEĻAKOVA, Dr. sc. ing., Riga M. TURKS, Dr. chem., Technical University, Latvia Riga Technical University, Latvia G. MEŽINSKIS, Dr. habil. sc. ing., V. KOKARS, Dr. chem., Riga Technical University, Latvia Riga Technical University, Latvia J. ZICĀNS, Dr. sc. ing., M. DZENIS, Dr. sc. ing., Riga Technical University, Latvia Riga Technical University, Latvia J. GRABIS, Dr. habil. sc. ing., Riga J. LOČS, Dr. sc. ing., Technical University, Latvia Riga Technical University, Latvia 8.00–8.50 Registration (1st floor hall) 8.50–9.00 Opening ceremony (room 272) Awarding of Paul Walden Prize Winner 2019 Prof. Māris Turks, Dean of the Faculty of Materials Science and Applied Chemistry, RTU, Latvia 9.00–9.20 About the reception of the “Walden”-inversion. Prof., Dr. rer. nat. Gisela Boeck, University of Rostock, Germany SESSION I ROOM 272 9.30–10.10 Recyclates in rotational moulding opportunities and challanges M. Eng. Christian Kehrberg, Institute of Polymer Technologies, Germany MATERIALS SCIENCE AND APPLIED CHEMISTRY Thursday, 3/7 P. Valdena Street, Riga Technical University 60th International October 24 Room 272; 445; 337 Scientific Conference PROGRAMME 10.15–10.30 Polymer triboelectrification mechanisms Andris Šutka, Riga Technical University, Latvia 10.30–10.45 Polybutylene succinate/cellulose/graphene composites Oskars Platnieks, Riga Technical University, Latvia 10.45–11.00 Analysis of curing kinetics models for polyester resin C-L ISO 112G Endija Namsone, Riga Technical University, Latvia 11.00–11.15 The effect of crosslinking on the electro-thermal properties of carbon black (CB) and ethylene-octene copolymer (EOC) composites Atrīda Bērziņa, Riga Technical University, Latvia 11.15–11.45 Coffee break 11.45–12.00 Relaxation polarization dependence of circular vector gratings in azobenzene molecular glassy filmsglassy films Andris Ozols, Riga Technical University, Latvia 12.00–12.15 Photochromic properties of TiO2 Raivis Eglītis, Riga Technical University, Latvia 12.15–12.30 ZnO photocatalysts modified with Eu2O3 and Sm2O3 Pāvels Radionovs, Riga Technical University, Latvia 12.30–13.30 Lunch (Not included) 13.30–14.30 Poster session (1st floor hall) 14.30–15.10 The needs and challenges to reproduce mechanical properties of articular cartilage Dr. Eiva Bernotiene, State Research Institute Centre for Innovative Medicine, Lithuania MATERIALS SCIENCE AND APPLIED CHEMISTRY Thursday, 3/7 P. Valdena Street, Riga Technical University 60th International PROGRAMME October 24 Room 272; 445; 337 Scientific Conference 15.15–15.30 Amorphous calcium phosphate biomaterials for bone regeneration Jana Vecstaudža, Riga Technical University, Latvia 15.30–15.45 From local to general reactogenicity of biphasic calcium phosphate bioceramics after implantation in osteoporotic bone Aleksandrs Grišuļonoks, Riga Stradins University, Latvia 15.45–16.00 The histomorphometry of rabbits bone tissue with experimental osteoporosis after implantation of biphasic calcium phosphate materials Vladislavs Anaņjevs, Riga Stradins University, Latvia SESSION II ROOM 445 9.30–10.10 Fluorescent nucleoside analogues with new properties for biophysics Asoc. prof. Byron W. Purse, San Diego State University, USA 10.15–10.30 New antioxidants containing 1,3-dioxane-4,6-dione moiety Inese Mieriņa, Riga Technical University, Latvia 10.30–10.45 Dithiafulvalene and tetrathiafulvalene donor group containing dyes for organic solar cell application Armands Rudušs, Riga Technical University, Latvia 10.45–11.00 Purine-Azole conjugates as fluorescent materials Armands Sebris, Riga Technical University, Latvia MATERIALS SCIENCE AND APPLIED CHEMISTRY Thursday, 3/7 P. Valdena Street, Riga Technical University 60th International October 24 Room 272; 445; 337 Scientific Conference PROGRAMME 11.00–11.15 Glassy 4H-pyran-4-ylidene fragment containing dyes for organic solid state laser applications Elmārs Zariņš, Riga Technical University, Latvia 11.15–11.45 Coffee break 11.45–12.00 Zero Pre-consumer waste approaches for sustainable clothing designs Anda Ščerbaka, Riga Technical University, Latvia 12.00–12.15 Garment fit and sizing development at pattern-making stage Eva Lapkovska, Riga Technical University, Latvia 12.15–12.30 In vitro assessment of antibacterial activity of modified textiles Ieva Baķe, Riga Technical University, Latvia 12.30–13.30 Lunch (Not included) 13.30–14.30 Poster session (1st floor hall) 14.30–15.10 Biomass and waste in germany - the role in the energy system, bioeconomy and climate protection Prof., Dr. Mont. Michael Nelles, University of Rostock, Germany 15.15–15.30 The pollution of water with pharmaceutical residues: a growing environmental concern Elīna Strade, Riga Technical University, Latvia 15.30–15.45 Valorization of glass and clay in the production of new multifunctional porous ceramics Andrejs Šiškins, Riga Technical University, Latvia MATERIALS SCIENCE AND APPLIED CHEMISTRY Thursday, 3/7 P. Valdena Street, Riga Technical University 60th International PROGRAMME October 24 Room 272; 445; 337 Scientific Conference 15.45–16.00 Changes in the biochemical composition of tomato fruit under the influence of illumination quality Ieva Erdberga, Latvia University of Life Sciences and Technologies, Latvia SEMINAR 1 (ROOM 337) FRONTIERS IN BIOTECHNOLOGIES: TECHNOLOGICAL ASPECTS PROJECT “INFLUENCE OF THE MAGNETIC FIELD INITIATED STIRRING ON BIOTECHNOLOGICAL PROCESSES”, NO. 1.1.1.1/16/A/144. 10.00–10.15 Significance of mixing and aeration in bioreactors Prof., Dr. sc. ing. Juris Vanags, Latvian State Institute of Wood Chemistry, Latvia 10.20–10.35 Application of computer fluid dynamics to bioreactor design and optimization, recent approaches PhD, leading researcher, Normunds Jēkabsons, University of Latvia, Latvia 10.40–10.55 Computational fluid dynamics (CFD) analysis for stirred tank bioreactors Mg. sc. ing. Armands Bušs, Riga Technical University, Latvia 10.55–11.10 Coffee break MATERIALS SCIENCE AND APPLIED CHEMISTRY Thursday, 3/7 P. Valdena Street, Riga Technical University 60th International October 24 Room 272; 445; 337 Scientific Conference PROGRAMME SEMINAR 2 (ROOM 337) FRONTIERS IN BIOTECHNOLOGIES: FUTURE PROSPECTIVES 11.10–11.25 Product obtainment using bacterial and yeast cultures M. sc. biol. Elīna Didrihsone, Latvian State Institute of Wood Chemistry, Latvia 11.30–11.45 Applications of mammalian cell cultures in biotechnological production processes M. sc. biol. Anna Ramata-Stunda, University of Latvia, Riga Technical University, Latvia 11.50–12.05 Microalgae-based pharmaceuticals and nutraceuticals Dr. sc. ing. Kristīne Veģere, Riga Technical University, Latvia Materials Science and Applied Chemistry, Riga, October 24, 2019 About the Reception of the “Walden”-Inversion Gisela Boeck Institute of Chemistry, University of Rostock e-mail: [email protected] Every student who attends lectures on organic chemistry comes across nucleophilic substitutions of first (SN1) and of second order (SN2). If the substitution takes place on an asymmetrically substituted carbon atom, the final product is exactly the enantiomer of the initial one in the case of SN2, or a racemic mixture in the case of SN1. The change from one to the other isomer during a SN2 reactions resembles an umbrella turning upside down. This phenomena is called Walden inversion because it was investigated by the Latvian scholar Paul Walden who later became professor at the University of Rostock. In the field of organic chemistry this is the only instance to encounter the name of Paul Walden which is normally connected with electrolytes in non-aqueous systems. The first part concerns with a short introduction of Walden´s biography. Then it will be explained why Walden came about stereochemical problems. Finally, the paper deals with the reception history of the Walden inversion. The following questions will be discussed: What do we know about the publication history? Who was interested in this stereochemical phenomenon? When and by whom the mechanism of this reaction was explained? References: 1. Walden P (1974) Wege und Herbergen. Mein Leben. Franz Steiner, Wiesbaden 2. Stradins J P, Solovjov J I (1988) Pavel Ivanovitch (Paul´) Wal´den. Nauka, Moskva 3. Zott R (1994) Wilhelm Ostwald und Paul Walden in ihren Briefen. Mit einem Begleittext: Paul Walden – Wissenschaftler zwischen den Kulturen? ERS-Verlag, Berlin 4. Walden P (1919) Optische Umkehrerscheinungen (Waldensche Umkehrung). Friedrich Vieweg und Sohn, Braunschweig 5. Walden P (1896) Ueber die gegenseitige Umwandlung optischer Antipoden. Ber Dtsch Chem Ges 29: 133-138 6. Fischer E (1906) Synthese von Polypetiden XV. Ber Dtsch Chem Ges 39: 2893-2931 7. Walden P (1905) Drehungsvermögen optisch aktiver Körper. Ber Dtsch Chem Ges 38: 345-409 8 Materials Science and Applied Chemistry, Riga, October 24, 2019 Recyclates in rotational moulding opportunities and challanges C. Kehrberg1, H. Hansmann1,2, N. Laufer1, K. Dietze1, C. Boss1, S. Ofe1 1Institut für Polymertechnologien e. V. 2Hochschule Wismar, FG Kunststofftechnik e-mail: kehrberg@ipt_wismar.de