Size and Zeta Potential of Colloidal Gold Particles
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First-Principles and Molecular Dynamics Simulation Studies of Functionalization of Au32 Golden Fullerene with Amino Acids
www.nature.com/scientificreports OPEN First-principles and Molecular Dynamics simulation studies of functionalization of Au32 golden Received: 4 August 2017 Accepted: 18 July 2018 fullerene with amino acids Published: xx xx xxxx M. Darvish Ganji1, H. Tavassoli Larijani2, R. Alamol-hoda1 & M. Mehdizadeh1 With the growing potential applications of nanoparticles in biomedicine especially the increasing concerns of nanotoxicity of gold nanoparticles, the interaction between protein and nanoparticles is proving to be of fundamental interest for bio-functionalization of materials. The interaction of glycine (Gly) amino acid with Au32 fullerene was frst investigated with B3LYP-D3/TZVP model. Several forms of glycine were selected to better understand the trends in binding nature of glycine interacting with the nanocage. We have evaluated various stable confgurations of the Gly/Au32 complexes and the calculated adsorption energies and AIM analysis indicate that non-Gly, z-Gly and also tripeptide glycine can form stable bindings with Au32 at aqueous solution via their amino nitrogen (N) and/or carbonyl/carboxyl oxygen (O) active sites. Furthermore, cysteine, tyrosine, histidine and phenylalanine amino acids bound also strongly to the Au32 nanocage. Electronic structures and quantum molecular descriptors calculations also demonstrate the signifcant changes in the electronic properties of the nanocage due to the attachment of selected amino acids. DFT based MD simulation for the most stable complex demonstrate that Gly/Au32 complex is quite stable at ambient condition. Our frst-principles fndings ofer fundamental insights into the functionalization of Au32 nanocage and envisage its applicability as novel carrier of the drugs. Drug delivery has gained a lot of attention as it can minimize the side efects of various drugs. -
Internal Structure of Polyelectrolyte Multilayers on Nanometer Scale
INTERNAL STRUCTURE OF POLYELECTROLYTE MULTILAYERS ON NANOMETER SCALE Inauguraldissertation zur Erlangung des akademischen Grades eines Doktors der Naturwissenschaften der Mathematisch-Naturwissenschaftlichen Fakult¨at der Ernst-Moritz-Arndt-Universit¨atGreifswald vorgelegt von Oxana Ivanova geboren am 06. April 1980 in Sankt-Petersburg (Russland) - Greifswald, 2010 - Dekan: Prof. Dr. Dr. Klaus Fesser 1. Gutachter: Prof. Dr. Christiane A. Helm 2. Gutachter: Prof. Dr. Monika Sch¨onhoff Tag der Promotion: 15. Oktober 2010 Ich m¨ochte mich ganz herzlich bei allen Mitarbeitern des Instituts f¨urPhysik f¨urzahllose fachverwandte sowie fachfremde Unterst¨utzungbedanken. Contents I Introduction to the Field of Research 7 1 Introduction 9 1.1 Polyelectrolytes and their Properties . 9 1.2 Layer-by-Layer Assembly of Polyelectrolytes . 10 1.3 Polyelectrolyte Multilayers . 13 1.4 Objectives . 15 2 Physical Background 17 2.1 Electrostatic and Secondary Interactions . 17 2.1.1 Electrostatic Interactions: Electric Double Layer . 18 2.1.2 Effect of Salt on Formation of PEMs . 21 2.1.3 Classification and Range of Intermolecular Forces . 22 2.1.4 Temperature Effect: Hydrophobic Interactions . 23 II Materials and Methods 25 3 Materials and Sample Preparation 27 3.1 Chemicals . 27 3.2 Fabrication of Multilayered Nanofilms . 29 4 Characterization Methods 33 4.1 X-ray and Neutron Reflectivity . 33 4.1.1 Basic Principles of X{ray and Neutron Reflection . 35 4.1.2 Reflection from Ideally Smooth & Rough Interfaces . 37 4.1.3 Refractivity Set{up . 41 4.2 UV-Vis Absorption Spectroscopy . 43 4.2.1 Interaction of Light with Matter . 43 4.2.2 Beer-Lambert Law . -
Characterization and Functionalization of Iron-Oxide Nanoparticles for Use As Potential Agents for Cancer Thermotherapy at the U
Characterization and Functionalization of Iron-Oxide Nanoparticles for Use as Potential Agents for Cancer Thermotherapy By Nora O’Reilly A dissertation submitted in partial fulfillment of the requirement for the degree of Doctor of Philosophy (Animal Science) At the University of Wisconsin-Madison 2013 Date of final oral examination: April 18th, 2013 The dissertation is approved by the following members of the Final Oral Committee: Professor Ralph Albrecht, Animal Science, Pediatrics, Pharmaceutical Sciences Professor Mark Cook, Animal Science Professor Amin Fadl, Animal Science Professor Manish Patankar, Obstetrics and Gynecology Professor Chris Brace, Radiology, Biomedical Engineering i Abstract This thesis presents experimental studies of iron oxide nanoparticle synthesis, functionalization, and intracellular hyperthermal effects on murine macrophages as a model in vitro system. Colloidal suspensions of magnetic nanoparticles (MNPs) are of particular interest in Magnetic Fluid Hyperthermia (MFH). Iron oxide nanoparticles (IONPs) have garnered great interest as economical, biocompatible hyperthermia agents due to their superparamagnetic activity. Here we seek to optimize the synthetic reproducibility and in vitro utilization of IONPs for application in MFH. We compared aqueous synthetic protocols and various protective coating techniques using various analytical techniques and in vitro assays to assess the biocompatibility and feasibility of the various preparations of nanoparticles. Using a co-precipitation of iron salts methodology, -
Stability Study of O/W Emulsions Using Zeta Potential
Available on line www.jocpr.com Journal of Chemical and Pharmaceutical Research __________________________________________________ J. Chem. Pharm. Res., 2010, 2(1): 512-527 ISSN No: 0975-7384 Stability study of O/W emulsions using zeta potential Nidhi Bhatt * 1 , Raj K. Prasad 1, Kuldeep Singh 1, G. M. Panpalia 2 1Shambhunath Institute of Pharmacy Jhalwa,Near IIIT, Allahabad, U. P., India 2Department of Pharmaceutical Science, BIT, Mesra, Ranchi, India ______________________________________________________________________________ Abstract Emulsions are widely used as medicinal and cosmetic delivery systems on account of general observations that emulsified materials normally possess the properties being exhibited by its bulk components. In order to widen scope of application of the conclusions drawn, o/w emulsions covering almost all routes of administration were considered for the study. These included parenteral emulsion, oral Emulsion and topical emulsion. Zeta potential including zeta deviation and peak position, and effective particle size of the emulsions including Z-average diameter, poly dispersity index and peak position were studied using a Zeta sizer (Malvern instrument). Employing Laser Doppler Electrophoresis and dynamic light scattering technique, Zeta potential and particle size distribution of the droplet as a function of time can be determined, which was done in this paper. Zeta potential is used to study the chemistry involved in determining whether or not an emulsion will remain stable in the environment where it will be used. Hence it is very much essential. The stability of all diluted emulsions (1% v/v) of samples in milli-Q water was studied. The parameters Zeta potential, particle size and pH were measured at 1, 2, 3, 6, 8, 10, 12, 15, 20, 30, 45, 60, 75, 90 days after dilution of the emulsions by mechanical mixing. -
Gold Nanoparticles and Quantum Dots: Their Optical Interaction and Application in a Hydrogel Modified Lateral Flow Sensing Device Julie A
University of Connecticut OpenCommons@UConn Doctoral Dissertations University of Connecticut Graduate School 6-8-2017 Gold Nanoparticles and Quantum Dots: Their Optical Interaction and Application in A Hydrogel Modified Lateral Flow Sensing Device Julie A. Jenkins University of Connecticut - Storrs, [email protected] Follow this and additional works at: https://opencommons.uconn.edu/dissertations Recommended Citation Jenkins, Julie A., "Gold Nanoparticles and Quantum Dots: Their Optical Interaction and Application in A Hydrogel Modified Lateral Flow Sensing Device" (2017). Doctoral Dissertations. 1521. https://opencommons.uconn.edu/dissertations/1521 Gold Nanoparticles and Quantum Dots: Their Optical Interaction and Application in A Hydrogel Modified Lateral Flow Sensing Device Julie Ann Jenkins, Ph.D. University of Connecticut, 2017 The goal of this dissertation was to study the optical properties of gold nanoparticles (Au NP) and quantum dots (QD) and to use their unique properties in sensing applications. The first part of this dissertation focuses on studying the dipole coupling in a gold nanoparticle random array. A blue shift and narrowing of the extinction peak, when compared to the single particle and solution spectra, was observed when 120 nm Au NPs were randomly immobilized on a glass substrate. This was determined to be due to the long-range dipole coupling of the Au NPs in the array. The motivation behind the second project was to study the temperature dependent change in decay kinetics of aqueous phase quantum dots when in close proximity to 120 nm Au NP, using α-carboxy-ω-Thiol terminated Poly(N-isopropyl acrylamide) (PNIPAM) as a spacer. The structure of PNIPAM will expand or collapse based with a change in temperature, thus varying the interparticle distance between the QD and the Au NP. -
THE OPTIMIZATION of GOLD COATED IRON NANOPARTICLE SYNTHESIS METHODS by Mark Riggs, B.S., B.S. a Thesis Submitted to the Gradua
THE OPTIMIZATION OF GOLD COATED IRON NANOPARTICLE SYNTHESIS METHODS by Mark Riggs, B.S., B.S. A thesis submitted to the Graduate Council of Texas State University in partial fulfillment of the requirements for the degree of Master of Science with a Major in Chemistry August 2014 Committee Members: Gary Beall Shannon Weigum Clois Powell COPYRIGHT by Mark Riggs 2014 FAIR USE AND AUTHOR’S PERMISSION STATEMENT Fair Use This work is protected by the Copyright Laws of the United States (Public Law 94-553, section 107). Consistent with fair use as defined in the Copyright Laws, brief quotations from this material are allowed with proper acknowledgment. Use of this material for financial gain without the author’s express written permission is not allowed. Duplication Permission As the copyright holder of this work I, Mark Riggs, authorize duplication of this work, in whole or in part, for educational or scholarly purposes only. DEDICATION I dedicate this to my wife, Melissa. Her constant support and encouragement were nothing short of heroic. Careful and delicate allocation of my focus became ever- increasing in importance throughout the progression of this research, primarily due to the birth of my beautiful daughter, Olivia Marie, on February 4th of 2014. My daughter’s arrival impacted my perception in ways I couldn’t have fully understood prior to that wonderful moment. I will be forever indebted to Melissa for showing me how blessed I am, enabling me to live a better life than I could have conceived, and providing never- ending assistance with caring for our daughter. -
The Effects of Zeta Potential and Flocculant Molecular Chain Length on the Flocculation of Fines
Western Michigan University ScholarWorks at WMU Paper Engineering Senior Theses Chemical and Paper Engineering 12-1970 The Effects of Zeta Potential and Flocculant Molecular Chain Length on the Flocculation of Fines Kai F. Chiu Western Michigan University Follow this and additional works at: https://scholarworks.wmich.edu/engineer-senior-theses Part of the Wood Science and Pulp, Paper Technology Commons Recommended Citation Chiu, Kai F., "The Effects of Zeta Potential and Flocculant Molecular Chain Length on the Flocculation of Fines" (1970). Paper Engineering Senior Theses. 66. https://scholarworks.wmich.edu/engineer-senior-theses/66 This Dissertation/Thesis is brought to you for free and open access by the Chemical and Paper Engineering at ScholarWorks at WMU. It has been accepted for inclusion in Paper Engineering Senior Theses by an authorized administrator of ScholarWorks at WMU. For more information, please contact wmu- [email protected]. THE �FFECTS OF ZETA POTENTIAL AND FLOCCULANT MOLECULAR CHAIN LENGTH ON THE FLOCCULATION OF FINES, r THESIS SUBMITTED TO THE DEPARTMENT OF PAPER TECHNOLOGY AT WESTERN MICHIGAN UNIVERSITY KALAMAZOO MICHIGAN AS PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF BACHELOR OF SCIENCE Kai F. Chiu WESTERN MICHIGAN UNIVERSITY KALAMAZOO MICHIGAN DECEMBER 1970 · - ACKNOWLEDGEMENT I would like to thank my senior thesis advisor, Dr. Stephen Kuko1ich, Department of Paper Technology, Western Michigan University, for his guidance and valuable assistance in times of dif':ficulties. I would also like to thank Mr. William Foster and Mr. Ralph Wisner of Dow Chemical Company, Midland, Michigan, for the chemicals used in this project. My gratitude is extended to Mr. -
Functionalization of Gold Nanoparticles by Inorganic Entities
nanomaterials Review Functionalization of Gold Nanoparticles by Inorganic Entities Frédéric Dumur 1,* , Eddy Dumas 2 and Cédric R. Mayer 3,4,* 1 Aix Marseille Univ, CNRS, ICR, UMR 7273, F-13397 Marseille, France 2 Institut Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint-Quentin-en-Yvelines, F-78035 Versailles, France; [email protected] 3 Laboratoire LuMin, FRE CNRS 2036, CNRS, Université Paris-Sud, ENS Paris-Saclay, Université Paris-Saclay, F-91405 Orsay CEDEX, France 4 Département de Chimie, UFR des Sciences, Université de Versailles Saint-Quentin-en-Yvelines, F-78035 Versailles, France * Correspondence: [email protected] (F.D.); [email protected] (C.R.M.); Tel.: +33-0491289059 (F.D.) Received: 25 February 2020; Accepted: 13 March 2020; Published: 18 March 2020 Abstract: The great affinity of gold surface for numerous electron-donating groups has largely contributed to the rapid development of functionalized gold nanoparticles (Au-NPs). In the last years, a new subclass of nanocomposite has emerged, based on the association of inorganic molecular entities (IME) with Au-NPs. This highly extended and diversified subclass was promoted by the synergy between the intrinsic properties of the shell and the gold core. This review—divided into four main parts—focuses on an introductory section of the basic notions related to the stabilization of gold nanoparticles and defines in a second part the key role played by the functionalizing agent. Then, we present a wide range of inorganic molecular entities used to prepare these nanocomposites (NCs). In particular, we focus on four different types of inorganic systems, their topologies, and their current applications. -
Open Rxg276 Final Thesis 2017.Pdf
The Pennsylvania State University The Graduate School Department of Chemical Engineering CHEMICALLY-DRIVEN TRANSPORT OF COLLOIDAL PARTICLES AND MOLECULES A Dissertation in Chemical Engineering by Rajarshi Guha 2017 Rajarshi Guha Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy August 2017 The dissertation of Rajarshi Guha was reviewed and approved* by the following: Darrell Velegol Distinguished Professor of Chemical Engineering Committee Co-Chair Dissertation Co-Advisor Manish Kumar Professor of Chemical Engineering Committee Co-Chair Dissertation Co-Advisor Ayusman Sen Distinguished Professor of Chemistry Dissertation Co-Advisor Thomas K. Wood Professor of Chemical Engineering Special Signatory Dissertation Co-Advisor Michael Hickner Professor of Materials Science and Engineering, Chemical Engineering Philip Savage Professor of Chemical Engineering Head of the Department of Chemical Engineering *Signatures are on file in the Graduate School iii ABSTRACT Chemically-driven transports are ubiquitous in nature and govern the working principles of several biochemical processes. Understading the mechanisms involved in such transport processes would enable us to answer and potentially solve many problems in separation, diagnostics, energy, electronics and communications. In this dissertation, I primarily addressed chemically-driven transports which arise from artificial and natural concentration gradients. The two major chemically-driven transports discussed in this dissertation are electrokinetic -
Emulsion Stability Oil
ADVANCED MATERIALS HANDLING | APPLICATION NOTE head R-C chain Emulsion Stability oil ® ® Nicomp and AccuSizer water EMULSION STABILITY — Figure 1. Emulsion with surfactant Most emulsions are not naturally stable and require careful formulation to create dispersions with enhanced shelf life. EMULSION FORMULATION AND STABILITY STUDY Various theories and instrumental techniques are available to — help formulators choose the optimum chemistry to achieve desired results. This application note is not a guide to emulsion A combination of analytical techniques was used to investigate formulation, but rather an introduction to the analytical techniques emulsion formulation and stability. Two surfactants, at varying available to guide the study of how to create stable emulsions. concentrations, were used to create oil in water emulsions. The mean size of the emulsion droplets was determined using the An emulsion is a mixture of two, or more liquids, that are Nicomp® dynamic light scattering (DLS) system. not typically miscible. Most are a two-phase system with a dispersed phase (smaller volume) and a continuous phase The Nicomp was also used to measure the zeta potential of the (greater volume). Types of emulsions include oil in water (o/w), droplets for all samples. Zeta potential can be used as a predictor of water in oil (w/o), and double emulsions such as a water in oil dispersion stability. The results from the Nicomp DLS measurements in water (w/o/w) emulsion. In an o/w emulsion the dispersed are reported as mean size and polydispersity index, PI.2 phase is the oil and the continuous phase is the water. The AccuSizer® single particle optical sizing (SPOS) system was Creating an emulsion typically requires an energy source to used to measure the large diameter droplet tail, an indication form the emulsion such as shaking, stirring, ultrasound, of emulsion stability. -
Functionalization of Gold Nanoparticles by Inorganic Entities Frédéric Dumur, Eddy Dumas, Cédric Mayer
Functionalization of Gold Nanoparticles by Inorganic Entities Frédéric Dumur, Eddy Dumas, Cédric Mayer To cite this version: Frédéric Dumur, Eddy Dumas, Cédric Mayer. Functionalization of Gold Nanoparticles by Inorganic Entities. Nanomaterials, MDPI, 2020, 10 (3), pp.548. 10.3390/nano10030548. hal-02542642 HAL Id: hal-02542642 https://hal.archives-ouvertes.fr/hal-02542642 Submitted on 1 Jul 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Review Functionalization of Gold Nanoparticles by Inorganic Entities Frédéric Dumur 1,*, Eddy Dumas 2 and Cédric R. Mayer 3,4 1 Aix Marseille Univ, CNRS, ICR, UMR 7273, F-13397 Marseille, France 2 Institut Lavoisier de Versailles, UMR CNRS 8180, Université de Versailles Saint-Quentin-en-Yvelines, F-78035 Versailles, France 3 Laboratoire LuMin, FRE CNRS 2036, CNRS, Université Paris-Sud, ENS Paris-Saclay, Université Paris- Saclay, F-91405 Orsay CEDEX, France 4 Département de Chimie, UFR des Sciences, Université de Versailles Saint-Quentin-en-Yvelines, F-78035 Versailles, France * Correspondence: [email protected]; Tel.: +33-0491289059 Received: 25 February 2020; Accepted: 13 March 2020; Published: 18 March 2020 Abstract: The great affinity of gold surface for numerous electron-donating groups has largely contributed to the rapid development of functionalized gold nanoparticles (Au-NPs). -
Gold, Silver and Platinum Nanoparticles: from New Synthetic
Adrián Fernández Lodeiro Gold, Silver and Platinum Nanoparticles: From New Synthetic Routes to Sensing, Catalysis and Bio-Applications Dissertação para a obtenção do Grau de Doutor em Química Sustentável Orientador Doutor José Luís Capelo Martínez Professor Associado com Agregação Faculdade de Ciências e Tecnologia (FCT) Universidade Nova de Lisboa (UNL), Portugal Co-Orientadores Doutora Julia Lorenzo Rivera Visiting Professor, Universitat Autònoma de Barcelona, UAB, Spain Doutor Hugo Miguel Baptista Carreira dos Santos Investigador Auxiliar, FCT Investigator Programme, FCT, UNL, Portugal Júri Presidente Prof. Doutor Manuel Luís De Magalhães Nunes Da Ponte Vogais Prof. Doutor Gilberto Paulo Peixoto Igrejas Prof. Doutor José Luís Capelo Martínez Prof. Doutor Jorge Pérez Juste Doutora Elisabete De Jesus Oliveira Marques March - 2019 Adrián Fernández Lodeiro Gold, Silver and Platinum Nanoparticles: From New Synthetic Routes to Sensing, Catalysis and Bio-Applications Dissertação para a obtenção do Grau de Doutor em Química Sustentável (Sustainable Chemistry) Orientador Doutor José Luís Capelo Martínez Professor Associado com Agregação Faculdade de Ciências e Tecnologia (FCT) Universidade Nova de Lisboa (UNL), Portugal Co-Orientadores Doutora Julia Lorenzo Rivera Visiting Professor, Universitat Autònoma de Barcelona, UAB, Spain Doutor Hugo Miguel Baptista Carreira dos Santos Investigador Auxiliar, FCT Investigator Programme, FCT, UNL, Portugal Júri Presidente Prof. Doutor Manuel Luís De Magalhães Nunes Da Ponte Vogais Prof. Doutor Gilberto