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Dissertations / Theses on the topic 'Catalytic gold nanoparticles'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Monti, Eleonora <1993&gt. "Supported gold nanoparticles for sustainable catalytic applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9758/4/Monti_Eleonora_tesi.pdf.

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The objectives of the present work are to investigate the influence of stabilizers in colloidal methods (sol-immobilization method) for the synthesis of preformed Au colloidal nanoparticles and the immobilization of the synthesized Au colloidal nanoparticles on supports, like activated carbon. By varying the nature of stabilizer (PVP, PEG, and PVA) and the weight ratio of stabilizer to metal, a number of Au based catalysts were prepared and the catalytic performance of the synthesized catalysts was tested for a range of model reactions. To determine the morphology of the unsupported and suppor

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2

Hathcock, David Jackson. "Dynamic and Catalytic Properties of Some Metallic Nanoparticles." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5134.

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Using a variety of techniques including femtosecond transient absorption spectroscopy, optical absorption, atomic force microscopy, the hot electron cooling dynamics of lithographically prepared gold nanoarrays, the effect of the surrounding environment, and the phonon oscillations of gold and silver nano-arrays were investigated. The cooling dynamics of gold nanoarrays on a glass substrate were found to be different from those of either colloidal nanodots in colloidal solution or films on glass substrate. The electron-phonon component of the electronic relaxation in the arrays was found to be

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3

Donoeva, Baira. "Study of catalytic and biological activity of gold-containing metal nanoparticles." Thesis, University of Canterbury. Chemistry, 2014. http://hdl.handle.net/10092/9761.

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Small particles of gold (< 100 nm) have attracted great interest among researchers due to the unique combination of their physicochemical properties. Among various research areas catalysis and bio-nanotechnology represent the largest areas of growth for gold nanoparticle research. Catalysts play a crucial role in the life of the modern society. More than 85 % of all chemical processes are catalytic, and this number is increasing every year. There is a constant demand to develop more efficient and durable catalysts in order to address increasing energy demands and environmental requirements. Th

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4

Kherde, Yogesh A. "Green Synthesis and Evaluation of Catalytic Activity of Sugar Capped Gold Nanoparticles." TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1388.

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Owing to the importance of gold nanoparticles in catalysis, designing of them has become a major focus of the researchers. Most of the current methods available for the synthesis of gold nanoaprticles (GNPs) suffer from the challenges of polydispersity, stability and use of toxic and harmful chemicals. To overcome these limitations of conventional methods, in our present study, we made an attempt to design a method for the green synthesis of monodispersed and stable gold nanoparticles by sugars which act as reducing and stabilizing agent. Characterization of synthesized nanoparticles was done

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Kudaibergenov, S. E., E. K. Baigaziyeva, N. N. Yesmurzayeva, Zh A. Nurakhmetova, and B. S. Selenova. "Synthesis, Characterization and Catalytic Property of Polymer Protected Gold and Silver Nanoparticles." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35096.

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Gold (AuNPs) and silver (AgNPs) nanoparticles protected by hydrophilic polymers were prepared by “one-pot” synthetic protocol. Absorption spectra, size, morphology and structure of obtained nanoparticles were investigated by UV-Vis spectroscopy, dynamic light scattering (DLS), and transmission electron mi-croscopy (TEM). The catalytic activity of polymer-protected AuNPs and AgNPs supported on the surface of aluminum oxide was evaluated with respect to decomposition of hydrogen peroxide. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35096

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Kudaibergenov, S. E., G. S. Tatykhanova, and E. Baigaziyeva. "Preparation, Characterization and Catalytic Activity of Gold Nanoparticles Stabilized by Hydrophilic Polymers." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35034.

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Optical properties, structure, size and morphology of colloidal gold nanoparticles (AuNPs) stabilized by a series of hydrophilic polymers possessing nonionic, anionic, cationic and amphoteric nature were characterized by visible spectroscopy, dynamic light scattering (DLS), X-ray diffraction (XRD) and scanning electron microscopy (SEM), transmission electron microscopy (TEM). The polymer-protected AuNPs were prepared by “one-pot” synthetic protocol. The kinetics of formation of AuNPs was determined. The influence of the molecular weight (Mw) of polymers and concentration of AuNPs on the s

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Nurgaziyeva, E. K., G. S. Tatykhanova, G. A. Mun, V. V. Khutoryanskiy, and S. E. Kudaibergenov. "Catalytic Properties of Gel-Immobilized Gold Nanoparticles in Decomposition Of Hydrogen Peroxide." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42525.

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This paper reports the study of hydrogen peroxide decomposition catalyzed by polymer-protected gold nanoparticles (AuNPs) immobilized within polyacrylamide hydrogel. The stabilization of AuNPs was achieved using hydrophilic polymers. Embedding of AuNPs stabilized with various polymers into polyacrylamide hydrogels was carried out using three ways: “in situ” polymerization, sorption and boronhydride methods. Size, shape and morphology of AuNPs were characterized by various physicochemical methods.

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8

Ono, Luis. "IN-SITU GAS PHASE CATALYTIC PROPERTIES OF METAL NANOPARTICLES." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3277.

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Recent advances in surface science technology have opened new opportunities for atomic scale studies in the field of nanoparticle (NP) catalysis. The 2007 Nobel Prize of Chemistry awarded to Prof. G. Ertl, a pioneer in introducing surface science techniques to the field of heterogeneous catalysis, shows the importance of the field and revealed some of the fundamental processes of how chemical reactions take place at extended surfaces. However, after several decades of intense research, fundamental understanding on the factors that dominate the activity, selectivity, and stability (life-time) o

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9

Martelli, Francesca. "Supported metal nanoparticles for sustainable green catalytic processes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20699/.

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Preformed Au nanoparticles supported on activated carbon and TiO2 were synthesised by sol-immobilisation. Polyethylene glycol, polyvinyl pyrrolidone and polyvinyl alcohol were used as stabilisers for the gold nanoparticles at different polymer/Au wt/wt ratios for each polymer. The effect of polymer/Au wt/wt ratios was investigated on (i) the average nanoparticle size, (ii) catalytic activity for two reactions, 4-nitrophenol reduction and glucose oxidation to glucaric acid. 4-nitrophenol reduction is recognised as a model reaction for nanomaterial catalytic activity tests; glucose oxidation to

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Ngungeni, Yonela. "Antimicrobial, anticancer and catalytic activities of green synthesized Avocado seed extract-gold nanoparticles." University of the Western Cape, 2019. http://hdl.handle.net/11394/7809.

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>Magister Scientiae - MSc<br>Nature through billions of years of trial and error has produced an immeasurable amount of natural systems like plants, birds and animals. The intelligence of nature is hidden in these natural systems and researchers are turning towards “Nature’s intelligence” to find inspiration and advance novelty in the development of nanomaterials. Gold nanoparticles (AuNPs) have unique optical, electronic and physicochemical features which has gained them popularity and widespread exploitation in various applications. The conventional methods used for AuNPs synthesis emp

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11

Carew, Alexander Jon. "Fundamental studies into the catalytic properties of metal-oxide supported gold and copper nanoparticles." Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367710.

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12

Kwon, Beatsam. "Catalytic reduction of organic pollutants using supported metal nanoparticles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23190/.

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Metal nanoparticle catalysts have in the last decades been extensively researched for their enhanced performance compared to their bulk counterpart. Properties of nanoparticles can be controlled by modifying their size and shape as well as adding a support and stabilizing agent. In this study, preformed colloidal gold nanoparticles supported on activated carbon were tested on the reduction of 4-nitrophenol by NaBH4, a model reaction for evaluating catalytic activity of metal nanoparticles and one with high significance in the remediation of industrial wastewaters. Methods of wastewater remedia

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13

Kydd, Richard Berwick Chemical Sciences &amp Engineering Faculty of Engineering UNSW. "Synthesis and characterisation of gold and copper oxidation catalysts." Awarded by:University of New South Wales. Chemical Sciences & Engineering, 2009. http://handle.unsw.edu.au/1959.4/44549.

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In this work, Gold and Copper oxidation catalysts supported on a range of metal oxides were synthesised via 2 previously uninvestigated preparation methods. In the first chapter, Gold nanoparticle catalysts were deposited onto TiO2, CeO2 and ZrO2 nanoparticles via the non-aqueous Modified Photodeposition procedure. This method was found to produce smaller Gold particle sizes following intrinsic excitation of the support than the conventional aqueous phase method, with surface physisorbed water apparently acting as the sacrificial reductant. The as prepared catalysts were drastically more activ

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Meduri, Kavita. "Carbon-Supported Transition Metal Nanoparticles for Catalytic and Electromagnetic Applications." Thesis, Portland State University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10933285.

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<p> Recently, there has been growing interest in using transition metals (TM) for catalytic and electromagnetic applications, due to the ability of TMs to form stable compounds in multiple oxidation states. In this research, the focus has been on the synthesis and characterization of carbon-supported TM nanoparticles (NPs), specifically palladium (Pd) and gold (Au) NPs, for catalytic applications, and transition metal oxides (TMO) NPs, specifically Fe<sub>3</sub>O<sub>4</sub> NPs for electromagnetic applications. Carbon supports have several advantages, such as enabling even distribution of pa

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15

Ghadamgahi, Sedigheh. "Size, Shape and Support Effects on the Catalytic Activity of Immobilized Nanoparticles." Thesis, University of Canterbury. Chemistry, 2014. http://hdl.handle.net/10092/10042.

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Abstract: A brief overview of this PhD thesis, The emergence of nanotechnology has stimulated both fundamental and industrially relevant studies of the catalytic activity of noble metal nanoparticles. Palladium, ruthenium and gold are well known catalysts when used in nanoparticle- based systems. This body of work endeavoured to investigate the catalytic activity of these noble metal nanoparticles through three studies as a briefly overviewed below. Study 1: Palladium is a well-known catalyst, even in bulk phases, but its high cost had driven industry towards its use in nanoparticle- based sy

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Manzheliy, E. A., N. V. Zyk, A. G. Majouga, E. K. Beloglazkina, and E. V. Golubina. "Study of Catalytic Activity of the New Nanohybrid Material Based on Gold Nanoparticles and 1,4-bis(Terpyridine-4'-yl)Benzene." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35121.

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The paper describes the synthesis of composite material consisting of 1,4-bis(terpyridine-4'-yl)benzene microcrystals and gold nanoparticles with an average size of 15 nm adsorbed on their surfaces. The nanohybrid material is obtained by the deposition of pre-synthesized nanoparticles on the surface of the organic compound. Mass content of gold in the obtained material is determined by the thermogravimetrical analysis. Catalytic reduction of para-nitrophenol is spectrophotometrically studied. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/1234567

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17

Papa, Letizia. "Synthesis of hybrid nanosheets of graphene oxide, titania and gold and palladium nanoparticles for catalytic applications." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-19062017-083751/.

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Nanocatalysis has emerged in the last decades as an interface between homogeneous and heterogeneous catalysis, offering simple solutions to problems that conventional materials have not been able to solve. In fact, nanocatalyst design permits to obtain structures with high superficial area, reactivity and stability, and at the same time presenting good selectivity and facility of separation from reaction mixtures. In this work, we prepared hybrid structures comprising gold, palladium and silver nanoparticles (Au, Pd and Ag NPs), titanate nanosheets (TixO2), graphene oxide (GO), and partially r

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18

DePuccio, Daniel P. "Investigating The Influence Of Gold Nanoparticles On The Photocatalytic And Catalytic Reactivity Of Porous Tungsten Oxide Microparticles." ScholarWorks @ UVM, 2016. http://scholarworks.uvm.edu/graddis/641.

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Tungsten oxide (WO3) is a semiconducting transition metal oxide with interesting electronic, structural, and chemical properties that have been exploited in applications including catalysis, gas sensing, electrochromic displays, and solar energy conversion. Nanocrystalline WO3 can absorb visible light to catalyze heterogeneous photooxidation reactions. Also, the acidity of the WO3 surface makes this oxide a good thermal catalyst in the dehydration of alcohols to various industrially relevant chemicals. This dissertation explores the photocatalytic and thermal catalytic reactivity of nanocrysta

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19

Shajkumar, Aruni. "Yolk-Shell Nanostructures Prepared via Block Copolymer Self-Assembly for Catalytic Applications." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232735.

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Yolk-shell nanostructures/yolk-shell nanoparticles are defined as a hybrid structure, a mixture of core/shell and hollow particles, where a core particle is encapsulated inside the hollow shell and may move freely inside the shell. Of the various classifications of yolk-shell nanostructures, a structure with an inorganic core and inorganic shell (inorganic/inorganic) has been studied widely due to their unique optical, magnetic, electrical, mechanical, and catalytic properties. In the work presented here, among the different inorganic/inorganic yolk-shell nanostructures noble metal@silica yolk

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20

Raffa, Patrizio. "Metal vapour synthesis of stabilized transition metal nanoparticles: characterization, studies on factors affecting particle size and catalytic applications." Doctoral thesis, Scuola Normale Superiore, 2009. http://hdl.handle.net/11384/85791.

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This PhD thesis is focused on the synthesis, characterization and evaluation of catalytic activity of stabilized platinum and gold nanoparticles, generated by use of the metal vaporization technique. Metal vapour synthesis allows to obtain platinum and gold particles with diameters in the range of few nanometers. The introduction of suitable organic molecules at various stage of the synthesis has proven to be useful in order to control the final size of the produced particles. The metal nanoparticles obtained by this new approach are very stable and can be easily handled and characteriz

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21

Ballarini, Filippo. "Synthesis and characterisation of electrospun gold on ceria catalysts." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23192/.

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Cerium oxide in catalysis can be used both as support and as a catalyst itself. Ceria catalyses many oxidations reactions, its excellent catalytic properties are due to its store oxygen storage capacity (OSC) and the reticular defects present on its surface. Different morphologies expose different reticular planes, and different reticular planes can expose different amounts of defects. The preparation method of cerium oxide can influence the surface area, morphology, and the number of defects in the sample. This work is focused on different preparation methods for gold nanoparticles supported

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22

Lavenn, Christophe. "Les thiolates d'or : des polymères de coordination [Au(SR)]n luminescents aux clusters [Aun(SR)m] pour la catalyse hétérogène." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10256.

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Les nanoparticules d'or de petite taille (< 5 nm) sont des matériaux qui présentent une bonne activité catalytique dans des réactions d'oxydation, et ce dans des conditions relativement douces. Cependant, il est difficile d'obtenir des nanoparticules monodisperses et de taille inférieure à 5 nm. En ce sens, les clusters d'or sont intéressants, car ce sont des composés atomiquement définis avec une formulation propre. Cela signifie que dans un cluster, le nombre d'atomes d'or et de ligands le stabilisant est déterminé. Comme ils peuvent être isolés purs, ils constituent donc une classe de na

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23

Shin, Hyeon Ung. "Catalytic property of fiber media supported palladium containing alloy nanoparticles and electrospun ceramic fibers biodurability study." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1458404276.

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Gallo, Irã Borges Coutinho. "Surface structure and electronic properties of carbon supported PdAu nanoparticles and their catalytic behavior toward the oxygen reduction reaction /." Araraquara, 2018. http://hdl.handle.net/11449/153370.

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Orientador: Hebe de las Mercedes Villullas<br>Banca: Rodrigo Fernando Costa Marques<br>Banca: Leandro Martins<br>Banca: Elisabete Inacio Santiago<br>Banca: Joelma Perez<br>Abstract: Carbon supported PdAu nanoparticles with different Au contents (20-50% in atoms) were synthesized using a procedure carried out in a liquid two-phase system. As-prepared materials presented similar average particle diameter (~3nm) with narrow distribution over the carbon support, as shown by Transmission Electronic Microscopy (TEM). The combined data from X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy

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Dhahri, Abdelwaheb. "Synthèse et caractérisation de nanocomposites conducteurs à base de « graphène » et de polysaccharides." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1069/document.

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L'objectif principal de cette thèse a été d'expérimenter de nouvelles voies d'exfoliation des feuillets de graphène dans des matrices polysaccharides telles que la cellulose et le chitosane dopé avec des nanoparticules d'or (Au). Notre stratégie a été d'explorer de nouvelles voies de greffage de molécules et de macromolécules sur des feuillets d'oxyde de graphène (GO). Dans un premier temps, nous avons donc oxydé un graphite commercial par la méthode de Hummers qui est apriori la méthode la plus simple à mettre en oeuvre pour produire une suspension stable de feuillets d'oxyde de graphène tota

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Dhahri, Abdelwaheb. "Synthèse et caractérisation de nanocomposites conducteurs à base de « graphène » et de polysaccharides." Electronic Thesis or Diss., Lyon, 2017. http://www.theses.fr/2017LYSE1069.

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L'objectif principal de cette thèse a été d'expérimenter de nouvelles voies d'exfoliation des feuillets de graphène dans des matrices polysaccharides telles que la cellulose et le chitosane dopé avec des nanoparticules d'or (Au). Notre stratégie a été d'explorer de nouvelles voies de greffage de molécules et de macromolécules sur des feuillets d'oxyde de graphène (GO). Dans un premier temps, nous avons donc oxydé un graphite commercial par la méthode de Hummers qui est apriori la méthode la plus simple à mettre en oeuvre pour produire une suspension stable de feuillets d'oxyde de graphène tota

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27

Behafarid, Farzad. "Structure, stability, vibrational, thermodynamic, and catalytic properties of metal nanostructures: size, shape, support, and adsorbate effects." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5121.

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Recent advances in nanoscience and nanotechnology have provided the scientific community with exciting new opportunities to rationally design and fabricate materials at the nanometer scale with drastically different properties as compared to their bulk counterparts. In this dissertation, several challenges have been tackled in aspects related to nanoparticle (NP) synthesis and characterization, allowing us to make homogenous, size- and shape-selected NPs via the use of colloidal chemistry, and to gain in depth understanding of their distinct physical and chemical properties via the synergistic

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Skelton, Helen Elisabeth. "Gold and gold-based nanoparticles for NOx reduction catalysis." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610182.

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Sarhid, Iyad. "Catalysis assisted by plasmon." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS227.

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Les nanoparticules (NPs) métalliques ont de nombreuses applications en catalyse. Certaines d’entre elles (or, argent, cuivre) présentent une absorption dans le visible résultant de l’excitation du plasmon de surface par un champ électromagnétique extérieur. Nous proposons dans ce projet de coupler les propriétés catalytiques de nanoparticules à base d’or avec leurs propriétés de résonance de plasmon de façon à assister la réaction catalytique notamment par l’effet thermique qui en découle. Cette approche de catalyse assistée par plasmon, est générale et peut être utilisée pour une variété de p

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Noschese, Annarita. "Sustainable catalysis by polymer supported gold nanoparticles." Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2206.

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2014 - 2015<br>Gold Nanoparticles are nanomaterials whose properties are completely different from the ones of the bulk material. Nowadays many chemists have been using them as catalysts which work under mild conditions and respect the principles green and sustainable chemistry. The increasing need for new heterogeneous catalysts to be applied in industrial processes encourages the finding of efficient and selective catalytic systems. The aim of the current PhD project is the synthesis of gold nanoparticles (AuNPs) supported onto a porous polymer matrix, consisting of syndiotactic polystyrene

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Iachella, Mathilde. "Nucléation, Croissance et Morphologie de Nanoparticules d'Or et d'Or-Cuivre sur Support Rutile par la Théorie de la Fonctionnelle de la Densité." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEN034/document.

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Dans cette étude, la nucléation, la croissance, la morphologie et la réactivité de nanoparticules Au, Cu et AuCu sont examinées sur support rutile TiO2 (110) stoechiométrique, réduit et hydraté. En premier lieu, la nucléation a été modélisée via l’adsorption et la diffusion d’atomes Au et Cu, à l’aide de calculs de type théorie de la fonctionnelle de la densité (DFT), et de diagrammes d’énergie libre en condition réaliste.Les résultats DFT+U ont montré le rôle promoteur des espèces hydroxyles en surface sur la nucléation, en accord avec les mesures expérimentales de microscopie STM. Ensuite, l

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Sarip, R. "Gold molecular clusters to nanoparticles : a bottom-up approach to supported nanoparticles for heterogeneous catalysis." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1380949/.

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This thesis covers a number of different aspects of chemistry including molecular inorganic chemistry, nanochemistry and heterogeneous catalysis. The key aspect of our research is a bottom-up approach towards generating gold nano-particulate heterogeneous catalysts. Two phosphine-stabilised gold clusters containing Au9 and Au13 cores were prepared and used as molecular precursors to tailor specific size of gold nanoparticles. A number of techniques were employed to characterise the clusters as well as the catalysts in order to follow the nano-particulate creation. The conventional incipient we

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Dietrich, Sascha. "(Metallo-)Dendrimers in Catalysis, Nanoparticle Stabilization and Biological Application." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-82016.

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(Metallo-)Dendrimers in Catalysis, Nanoparticle Stabilization and Biological Application Technische Universität Chemnitz, Fakultät für Naturwissenschaften Dissertation 2011, 165 Seiten Die vorliegende Dissertationsschrift befasst sich mit der Darstellung, Charakterisierung und Anwendung neuartiger (Metallo-)Dendrimere. Den Schwerpunkt der Arbeit bildet dabei die terminale Funktionalisierung (Poly)amidoamin-basierender Dendrimere kleiner Generationen. Durch Standardpeptid-Knüpfungsreaktionen von 1,1´-(Diphenylphosphino)ferrocen-carbonsäure an dendritische (Poly)amidoamine ist eine Serie ent

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Slazus, Ene. "Dendrimer encapsulated gold nanoparticles as catalyst precursors for oxidative transformations of unsaturated hydrocarbons." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/96790.

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Thesis (MSc)--Stellenbosch University, 2015.<br>ENGLISH ABSTRACT: In an attempt to produce active catalysts for the oxidation of alkanes, hydrophobic dendritic micelle encapsulated gold nanoparticles were prepared. Dendrimers are well suited as templates for the encapsulation of metal nanoparticles as they can control the size and distribution of the particles. Using hydrophobic dendritic micelles it was found that the mode of encapsulation is driven by the solubility of the metal ions and not complexation of these ions, as is the case with conventional dendrimers. The dendritic micelles

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Guillois, Kevin. "Études des mécanismes d’oxydations aérobies des hydrocarbures lourds catalysées par les nanoparticules d’or." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10054.

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L’objectif de ce travail est de proposer un mécanisme réactionnel pour l’oxydation aérobie d’hydrocarbures lourds, alcanes et alcènes, catalysée par les nanoparticules d’or. La co-oxydation du stilbène et du méthylcyclohexane est utilisée comme réaction modèle afin de comprendre les nombreux mécanismes mis en jeu. Le criblage initial d’une large gamme de catalyseurs d’or nous permet de mettre en évidence des effets de support dans cette réaction et d’établir un cahier des charges bien défini pour l’élaboration d’un catalyseur de référence. Une méthode chimique simple est mise au point pour pré

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Kist, Madelyn M. "Light-induced surface site manipulation of gold nanoparticles using diazonium salt." Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1626960076521484.

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Barngrover, Brian Michael. "Theoretical investigation of the growth mechanism of gold thiolate nanoparticles." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18892.

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Doctor of Philosophy<br>Department of Chemistry<br>Christine M. Aikens<br>This body of work describes a theoretical study of the growth mechanism of gold thiolate nanoparticles from Au(III) as synthesized in the Brust-Schiffrin method. The Au(III) salt can be reduced to form Au(I) by two thiols or a hydride. Depending on the polarity of the solvent, the Au(I) species will either yield rings and anionic chains, remain in isolation, or create an ionic complex with the phase transfer agent. No matter what form the Au(I) species takes, a second reduction must occur to yield Au(0). If the solvent i

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Huang, Xiaohua. "Gold Nanoparticles Used in Cancer Cell Diagnostics, Selective Photothermal Therapy and Catalysis of NADH Oxidation Reaction." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10565.

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Gold nanoparticles strongly absorb and scatter visible and near infrared light because of the strongly enhanced electric fields at the surface. This provides the potential of designing novel optically active reagents for simultaneous molecular imaging and photothermal cancer therapy. In this thesis, gold nanospheres and nanorods conjugated with anti-epidermal growth factor receptor (anti-EGFR) antibodies that specifically target EGFR on the cell surface are shown to be used for dual diagnostics and therapy. Using micro-absorption spectroscopy and light scattering imaging, cancerous (HOC 313 an

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Li, Na. "Nanoparticules d'or fonctionnelles pour les applications biomédicales et catalytiques." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0106/document.

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Le design et l’ingénierie de nanoparticules d’or (AuNPs) polyfonctionnelles suscitent un intérêt considérable en vue d’applications en nanomédecine, reconnaissance moléculaire, dans le domaine des capteurs et en catalyse dans un environnement aqueux. Cette thèse a été dédiée à une variété de fonctionnalisations, en particulier à l’aide de la méthode “click” impliquant la catalyse par le cui vre (I) de lacycloaddition des alcynes terminaux avec les azotures avec le catalyseur [Cu(hexabenzyltren)] Br pour l’introduction de polyéthylène glycol, carborane,ferrocène, coumarine, cyclodextrine, médic

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Neri, Simona. "Tunable nanosystems for sensing and catalysis." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424423.

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Au NP have emerged as versatile scaffolds for applications in sensing and catalysis due to their unique features such as high stability, biocompatibility, ease of preparation, size- and shape-dependent optical and electronic properties and high surface area to volume ratio. The surface of Au NP can be readily modified with ligands containing functional groups such as thiols, phosphines and amines, which exhibit strong affinity for gold surfaces. The cooperative and collective effects achieved by the organization of organic components on the particle provide all the characteristics of a multiva

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Garcia, Martin Sergio. "Dynamic Nanoproteins: Self-Assembly of Peptides on Monolayer Protected Gold Nanoparticles." Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424215.

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Protein-protein interactions mediate a large number of important regulatory pathways in the organism and also play a central role in many pathologies. Protein surface recognition provides a powerful tool for the regulation of those protein-protein interactions. Gold nanoparticles offer a suitable platform for multi-functionalization with a wide range of biological ligands for the selective binding and detection of biological targets such as proteins. In particular, gold nanoparticles functionalized with peptide fragments are very attractive for that purpose, since peptides contain all necessar

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Stefanescu, Cristina F. "Exploration of catalysis activation emergency as a function of gold nanoparticle surface morphology." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43207.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2008.<br>Includes bibliographical references (p. 45).<br>The application of rippled gold nanoparticles with bi-ligand surface morphology as a catalyst was tested. The hydrolysis of 2,4-dinitrophenyl acetate (DNPA) served as the catalytic reaction being analyzed and the bi-ligand composition used was 16-mercaptohexadecanoic acid to imidazole thiol (MHA to IT). The influence of temperature on catalytic reaction of DNPA with the MHA: IT system was tested for ligand rations of 2:1, 1:2, and 1:1 by mon

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Marquez, Soto Daniela Trinidad. "Plasmon-Mediated Photothermal Phenomena and Nanofabrication of Applicable Devices." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36002.

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This thesis studies the different ways in which the localized plasmon heating effect of gold nanostructures -activated by plasmon excitation via visible and/or NIR irradiation- can be used to obtain different outcomes following the nanofabrication of applicable devices. Both spatial and temporal control were obtained for each one of the systems developed upon the incorporation of plasmonic gold nanostructures. Spatial control was enabled in hybrid mesoporous drug delivery systems fabricated in this thesis through the localized surface plasmon heating effect that allowed the modification of the

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Bordley, Justin Andrew. "Cubic architectures on the nanoscale: The plasmonic properties of silver or gold dimers and the catalytic properties of platinum-silver alloys." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55025.

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This thesis explores both the optical and catalytic properties of cubic shaped nanoparticles. The investigation begins with the sensing capabilities of cubic metal dimers. Of all the plasmonic solid nanoparticles, single Ag or Au nanocubes exhibit the strongest electromagnetic fields. When two nanoparticles are in close proximity to each other the formation of hot spots between plasmonic nanoparticles is known to greatly enhance these electromagnetic fields even further. The sensitivity of these electromagnetic fields as well as the sensitivity of the plasmonic extinction properties is importa

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Mukhoro, Ofhani Christopher. "Green Synthesis and characterization of gold Nanoparticles using Green Alga Ulva Lactuca and evaluation of their Catalytric Role." University of the Western Cape, 2016. http://hdl.handle.net/11394/6078.

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Magister Scientiae - MSc (Biotechnology)<br>Nanoparticles synthesized using typical chemical procedures have associated environmental risks because of the use of hazardous chemicals. With the ever-increasing potential application for nanomaterials, there is a growing need to develop new synthetic procedures for nanomaterials which are non-toxic and eco-friendly. This study presents, as a first step, the screening of the aqueous extracts of several seaweeds in order to assess their ability to produce gold nanoparticles (AuNPs). Eleven aqueous extracts were screened for the synthesis of AuNPs an

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Badwaik, Vivek D. "Single-Step Biofriendly Synthesis of Surface Modifiable, Near-Spherical Gold Nanoparticles for Applications in Biological Detection and Catalysis." TopSCHOLAR®, 2011. http://digitalcommons.wku.edu/theses/1092.

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There is an increased interest in understanding the toxicity and rational design of gold nanoparticles (GNPs) for biomedical applications in recent years. Such efforts warrant reliable, viable, and biofriendly synthetic methodology for GNPs with homogeneous sizes and shapes, particularly sizes above 30 nm, which is currently challenging. In the present study, an environmentally benign, biofriendly, singlestep/ single-phase synthetic method using dextrose as a reducing and capping agent in a buffered aqueous solution at moderate temperature is introduced. The resulting GNPs are near-spherical,

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Ventimiglia, Alessia. "Theoretical and experimental studies of gold catalysts for glucose oxidation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21701/.

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The glucaric acid (GLA) has been identified as a “top value-added chemical from biomass” that can be employed for many uses; for instance, it could be a precursor of adipic acid, a monomer of Nylon-6,6. GLA can be synthetized by the oxidation of glucose (GLU), passing through the intermediate gluconic acid (GLO). In recent years, a new process has been sought to obtain GLA in an economic and environmental sustainable way, in order to replace the current use of HNO3 as a stoichiometric oxidant, or electrocatalysis and biochemical synthesis, which show several disadvantages. Thereby, this work

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Grayson, Benjamin Alan. "Application and modeling of TiO2-supported gold nanoparticles for CO preferential oxidation in excess hydrogen." [Tampa, Fla.] : University of South Florida, 2007. http://purl.fcla.edu/usf/dc/et/SFE0002131.

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Garcia, Soto Carolina Alejandra. "Investigation of gold-based catalysts for liquid phase oxidation of glucose to glucaric acid." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18623/.

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Glucaric acid (GA) is one of the building block chemicals derived from sugar biomass with higher added value. Nowadays, GA is produced by oxidation of glucose (Glu) with either stoichiometric oxidants (HNO3), or by means of electrochemical or biochemical synthesis. However, these processes show drawbacks from either the environmental or economic viewpoint. For this reason, gold nanoparticles (Au NPs) supported on activated carbon (AC) have been studied as catalysts for the oxidation of Glu, using O2 as oxidant in the presence of a base. Using sol immobilization technique, Au NPs have been supp

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Shahin, Zahraa. "Au25(SR)18 gold thiolate clusters and metal organic frameworks in catalytic transformations." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1195/document.

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Ce projet concerne la synthèse et caractérisation de nouveaux matériaux composites à base de nanoclusteurs de thiolates d’or Au25(SR)18 (tGNCs), supportés sur divers polymères de coordination (MOFs), ainsi que sur ZrO2. L’activité catalytique de ces matériaux a été évaluée sur la transformation de différents substrats. Les tGNCs sont des matériaux atomiquement bien définis et connus pour être actifs dans des réactions d’oxydation. Les nanoparticules de MOFs sont des matériaux pouvant servir de support pour des tGNCs avec de bonnes dispersions. Certains MOFs sont connus pour avoir des propriété

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