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Dissertations / Theses on the topic 'Metallic nanoparticle'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Campbell, Fallyn Wilson. "The voltammetry of metallic nanoparticle arrays." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:201062ee-7a30-4fd5-a461-5581a5115458.

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The experimental work discussed in this thesis examines the effect of voltammetry of nanoparticle arrays with a specific focus on the effect of nanoparticle size and surface coverage on the substrate electrode. These effects are investigated in relation to the reduction of hydrogen peroxide, 4-nitrophenol and the hydrogen evolution reaction. In each case, the experimental data obtained is subsequently fitted using numerical simulations to extract quantitative kinetic data. Distinct differences are noted between macro – and nano – scale. The reduction of H₂O₂ reveals the absence of autocatalysi

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2

Kitchens, Christopher Lawrence Roberts Christopher B. "Metallic nanoparticle synthesis within reverse micellar micromulsion systems." Auburn, Ala., 2004. http://repo.lib.auburn.edu/EtdRoot/2004/FALL/Chemical_Engineering/Dissertation/kitchcl_13_Dissertation(abbrv).pdf.

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3

Cacha, Brian Joseph Gonda. "Metallic nanoparticle deposition techniques for enhanced organic photovoltaic cells." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1598627.

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<p> Energy generation via organic photovoltaic (OPV) cells provide many advantages over alternative processes including flexibility and price. However, more efficient OPVs are required in order to be competitive for applications. One way to enhance efficiency is through manipulation of exciton mechanisms within the OPV, for example by inserting a thin film of bathocuproine (BCP) and gold nanoparticles between the C<sub>60</sub>/Al and ZnPc/ITO interfaces, respectively. We find that BCP increases efficiencies by 330% due to gains of open circuit voltage (<i>V<sub>oc</sub></i>) by 160% and short

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4

Gupta, Vaibhav. "Synthesis of Metallic Nanoparticles and Their Applications." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1136846342.

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5

MAGLIE, M. DE. "BIODISTRIBUTION AND TOXICITY OF METALLIC NANOPARTICLES:IN VIVO STUDIES IN MICE." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/487404.

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In the last decade, nanotechnology has emerged as one of the fastest growing area of science. This is a highly promising field for the generation of new engineering applications, consumer products, medical healthcare and medicine. However, the increasing development of nanomaterials (NMs) is not supported by in vivo studies taking systematically into consideration nanoparticles (NPs) types, doses and period of treatment that would allow to forecast possible adverse outcomes that might occur upon human exposure. In our studies, fully characterized silver nanoparticles (AgNPs) and iron oxide na

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6

Triboulet, Sarah. "Etude des effets de deux types de nanoparticules métalliques sur des macrophages murins par une approche protéomique." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENV021/document.

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Les nanoparticules (NP) métalliques occupent une place de plus en plus importante, tant dans les procédésindustriels que dans la recherche biomédicale. Néanmoins, les données sur leur toxicité potentielle pour lesorganismes vivants restent insuffisantes, notamment à l’échelle moléculaire. Des exemples historiques montrentque certaines pathologies, comme la silicose et l’asbestose, peuvent être engendrées par l’exposition chroniqueà des particules inorganiques (silice et fibres d’amiante). Dans les deux cas, la réponse des macrophagesalvéolaires est en grande partie responsable de la maladie. L

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7

Bhattacharjee, Linkon. "DEGRADATION OF 1,4-DIOXANE USING METALLIC NANOPARTICLES UNDER VISIBLE LIGHT." OpenSIUC, 2020. https://opensiuc.lib.siu.edu/theses/2655.

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1,4-dioxane is an emerging contaminant and fully miscible organic compound which has been found extensively in wastewater effluent. Conventional water treatment technologies like carbon adsorption, and air stripping are inefficient in removing this extremely mobile and persistent contaminant from water. In this study, different types of metallic nanoparticles, e.g., nanoscale zero-valent iron (nZVI), γFe2O3, and Fe(III)-doped TiO2 were used to investigate the removal of 1,4-dioxane under visible light. These nanoparticles were characterized with scanning electron microscope (SEM), transmission

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8

MANCUSO, CLARA. "Dietary metallic nanoparticles: a new environmental factor in the development od Celiac Disease?" Doctoral thesis, Università degli Studi di Milano-Bicocca, 2019. http://hdl.handle.net/10281/241329.

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Sebbene l'uso di nanomateriali sta crescendo, non è ancora stato capito se rappresenti un rischio per la nostra salute. Particolarmente, l'uso di nanoparticelle nell'industria alimentare è preoccupante. Infatti, differenti gruppi di ricerca hanno dimostrato che, particolarmente le nanoparticelle metalliche, possono alterare l'omeostasi intestinale. Conseguentemente potrebbero rappresentare un fattore di rischio nell'insorgenza di patologie infiammatorie intestinali, come la Celiachia. La Celiacha è una patologia autoimmune che si sviluppa in soggetti geneticamente predisposti, dopo l'ingestion

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9

Stark, Kirsty Scott. "Using nanoparticle stabilised emulsions to encapsulate low molecular weight species in a metallic shell." Thesis, University of Leeds, 2018. http://etheses.whiterose.ac.uk/20228/.

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Encapsulation and controlled release of active ingredients in formulated products can provide benefits to a number of industries such as cosmetics, pharmaceuticals, agrochemicals, home and personal care products and fragrances. The main roles of encapsulation are to isolate an active material from its surroundings so as to act as a form of protection from exterior environments and to provide a mechanism for controlled release. One of the prominent challenges of encapsulating small compounds, such as those found in drugs, vitamins, fragrance and flavour oils, arises from the fact that the perme

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10

AMICI, JULIA GINETTE NICOLE. "Preparation and characterization of metallic and metal oxide nanoparticles for biomedical applications." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2511697.

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Two of the 21st century most promising technologies are biotechnology and nanotechnology. This science of nanoscale structures deals with the creation, investigation and utilization of systems that are 1000 times smaller than the components currently used in the field of microelectronics. Convergence of these two technologies results in growth of nanobiotechnology. This interdisciplinary combination can create many innovative tools. The biomedical applications of nanotechnology are the direct products of such convergence. Indeed, due to their unique size-dependent properties, nanomaterials hav

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11

Erbi', Matteo. "Impact of Mechanical Loading on the Deformation and the Electronic Properties of Metallic Nanoparticles." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS620.

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Les nanoparticules métalliques (NPs) sont des objets fascinants possédant des propriétés uniques qui diffèrent considérablement de leurs homologues massifs en raison de leur rapport surface/volume élevé. Ainsi, de nombreuses applications sont envisagées dans diverses domaines tels que la catalyse, la médecine ou encore l’optique. Toutefois, quel que soit leur domaine d’utilisation, les nanoparticules peuvent être soumises à des contraintes mécaniques entraînant des modifications structurales avec un impact considérable sur les applications visées. Dans cette thèse, nous explorons l'influence d

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12

Meader, Victoria K. "Metal Nanoparticle Synthesis by Photochemical Reduction with a High-Intensity Focused Laser Beam." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6001.

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Colloidal, metallic nanoparticles have myriad applications, but they are most ideal when they are monodisperse, and demonstrate maximum catalytic utility when they are small (< 5 nm) and uncoated; because their surface area is accessible and maximized. Laser- assisted metal nanoparticle synthesis is a ‘green’ method that has become a topic of active research because it is able to produce uncoated or ‘naked’ products. The nanoparticles synthesized in this work were formed through the reduction of metal salts in aqueous solutions; but the reducing agent is an electron-dense microplasma generated

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13

Schincariol, Simone. "Optimization of nanopaint with metallic touch for polymeric auto components." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/16443.

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Mestrado em Engenharia Mecânica<br>The traditional chrome plating is a process that gives prestige to car components, but it is an expensive and lengthy process that requires metal substrates. This thesis proposes an alternative to chroming process that involves the use of polymeric substrates coated with a chrome paint doped with high thermal conductivity nano-paricles, in order to obtain plastic components that give the feeling of metalic touch. In this dissertation the process of production of nanopaint adding carbon nanotubes and nano-Fe3O4 has been optimized and RGB color tests, thermal a

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14

Gunnarsson, Rickard. "Titanium oxide nanoparticle production using high power pulsed plasmas." Licentiate thesis, Linköpings universitet, Plasma och beläggningsfysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128622.

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This thesis covers fundamental aspects of process control when growing titanium oxide nanoparticles in a reactive sputtering process. It covers the influence of oxygen containing gas on the oxidation state of the cathode from which the growth material is ejected, as well as its influence on the particles oxidation state and their nucleation. It was found that a low degree of reactive gases was necessary for nanoparticles of titanium to nucleate. When the oxygen gas was slightly increased, the nanoparticle yield and particle oxygen content increased. A further increase caused a decrease in part

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15

Kushikawa, Ricardo Tomitan. "Aplicação de nanopartículas intermetálicas de NiSb e metálicas de Pt suportadas em carbono Vulcan® XC72 no desenvolvimento de um sensor eletroquímico." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-04052015-153440/.

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Neste trabalho desenvolveu-se um sensor eletroquímico a partir da modificação de superfície de um eletrodo de carbono vítreo com nanopartículas metálicas de Pt e intermetálicas de NiSb suportadas em carbono Vulcan® XC72. Tal modificação visou à obtenção de um sensor de baixo custo, simples e rápido para determinação do cloridrato de tetraciclina (TTC). A tetraciclina é um fármaco com propriedades antibióticas amplamente utilizado na saúde humana e animal devido sua baixa toxicidade e fácil obtenção. A modificação de superfície do eletrodo de trabalho foi realizada a partir da adição de uma

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16

Corkery, Robert, and robert corkery@anu edu au. "Artificial biomineralisation and metallic soaps." The Australian National University. Research School of Physical Sciences and Engineering, 1998. http://thesis.anu.edu.au./public/adt-ANU20080124.190014.

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In this thesis, geometry is used as a basis for conducting experiments aimed at growing and arranging inorganic minerals on curved interfaces. Mineralisation is directed using crystalline and liquid-crystalline metallic soaps and surfactant/water systems as templates.¶ A review of the history, syntheses, structure and liquid crystallinity of metallic soaps and other amphiphiles is presented as a foundation to understanding the interfacial architectures in mesostructured template systems in general.¶ In this study, a range of metallic soaps of varying chain length and cation type are synthesise

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17

Huang, Yiming. "New plasmonic photocatalysts for fine organic synthesis." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/116809/1/Yiming_Huang_Thesis.pdf.

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Using visible light to accelerate fine organic synthesis reactions in the presence of photocatalyst is a step forward to the green chemical industry. This thesis developed gold, gold-palladium alloy and copper photocatalysts. Aqueous reactions system is introduced into photocatalysis for an eco-friendly process. The bi-metal nanoparticle is applied to expand the application of metallic photocatalysis in selective synthesis. The theory for copper nanostructure stabilisation on metal nitride is established and successfully applied in organic synthesis. This research is beneficial to the future o

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18

Di, Pietro Patrizia. "Hybrid organic-inorganic nanomaterials for applications at the biointerfaces." Doctoral thesis, Università di Catania, 2017. http://hdl.handle.net/10761/3843.

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In the last few years, the application of nanomaterials (NMs) as theranostic devices, which combine diagnostic and therapeutic features, has gained a tremendous interest and development. Still, the major challenge is the understanding of the many and often complex processes that occur during the interaction of biological compounds with nanomaterials, in order to modulate their responses to the fixed target. A fine development of such smart nanosystems could occur only by a critical control of chemical/physical properties of NMs at the biological interfaces. According to such premises, this t

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19

Helgadottir, Inga. "Synthèse Contrôlée de Nanoparticules de Métaux Oxophiles en Milieu Liquide lonique pour Applications en Microélectronique." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10286.

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Les nanoparticules et nano alliages métalliques (dont la taille est inferieure à 10 nm) revêtent un grand intérêt dans de nombreuses applications, pour lesquelles un contrôle précis de la taille, de la composition et de la morphologie de ces objets sont requis. En effet, la diversité des compositions et des structures (taille, morphologie et arrangement atomique) offre une gamme presque illimitée de possibilités. Ce travail de thèse étend une approche développée au Laboratoire, qui consiste à former des nanoparticules métalliques de taille contrôlée (inférieure à 5 nm) par décomposition de pré

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20

Tijiwa, Birk Felipe. "Spin electronics in metallic nanoparticles." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39525.

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The work presented in this thesis shows how tunneling spectroscopy techniques can be applied to metallic nanoparticles to obtain useful information about fundamental physical processes in nanoscopic length scales. At low temperatures, the discrete character of the energy spectrum of these particles, allows the study of spin-polarized current via resolved "electron-in-a-box" energy levels. In samples consisting of two ferromagnetic electrodes tunnel coupled to single aluminum nanoparticles, spin accumulation mechanisms are responsible for the observed spin-polarized current. The observed effect

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21

Ibrahim, Mahmoud. "Rhodium based mono-and bi-metallic nanoparticles : synthesis, characterization and application in catalysis." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30063/document.

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Dans cette thèse, la synthèse, la caractérisation et les applications en catalyse de nanoparticules mono- et bimétalliques à base de rhodium sont décrites. Le rhodium a été choisi comme métal central de cette étude en raison de son intérêt reconnu en catalyse, principalement pour les réactions d'hydrogénation et d'hydroformylation. La synthèse de nanoparticules de rhodium monométalliques constitue le coeur de ce travail. Elle a été réalisée par décomposition du complexe organométallique [Rh(C3H5)3] en solution, sous pression de dihydrogène et en présence de différents stabilisants tels que des

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22

Pfeifer, Viktor. "Tritium and Deuterium Labelling of Bioactive Molecules Catalyzed by Metallic Nanoparticles." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS275/document.

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Cette thèse vise à développer de nouvelles méthodes efficaces pour incorporer des isotopes de l’hydrogène dans les molécules organiques complexes, après une introduction portant sur les applications et la synthèse des molécules marquées par le deutérium et tritium. Les méthodes permettant le marquage, par échange isotopique direct, d’hétérocycles azotés par des isotopes de l’hydrogène restent perfectibles, voire inexistantes dans certains cas, malgré la récurrence de ce type de sous-structures dans les molécules d’intérêt pharmacologique. Pour cette raison, la majeure partie de ce travail a co

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23

Henz, Brian John. "Molecular dynamics studies of metallic nanoparticles." College Park, Md. : University of Maryland, 2009. http://hdl.handle.net/1903/9202.

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Thesis (Ph.D.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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24

To, Yuk-fai. "Potential biomedical application of metallic nanoparticles." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39634322.

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25

To, Yuk-fai, and 杜鈺輝. "Potential biomedical application of metallic nanoparticles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39634322.

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26

Wang, Huan. "Modeling of the plasmon resonance of metallic nanopaticles embedded in liquid crystal." Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0004/document.

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Les nanoparticules métalliques ont des propriétés optiques uniques, dont le contrôle et l'optimisation ont un intérêt grandissant tant pour la recherche fondamentale qu'appliquée. Une propriété spectaculaire de ces nanoparticules est la résonance plasmon de surface localisé, qui est une conséquence des oscillations des électrons libres à l'interface métal/diélectrique.La position spectrale de la résonance plasmon est largement dépendante de la géométrie des nanoparticules, mais aussi de la constante diélectrique du milieu environnant. Un moyen pour contrôler cette résonance consiste donc à fai

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27

Zonias, Nicholas. "Atomistic simulations of semiconductor and metallic nanoparticles." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/202861/.

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Semiconductor and metallic nanoparticles have recently become an attractive area of intensive research due to their unique and diverse properties, that differ significantly from bulk materials. With a wide range of applications and potential uses in nanoelectronics, catalysis, medicine, chemistry or physics an important amount of experimental and theoretical investigations aim to facilitate deeper understating in their physical and chemical behaviour. Within this context, this thesis is focused on the theoretical investigation of silicon, gold and platinum nanoclusters and nanoalloys, in order

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28

Aarons, Jolyon. "Density functional theory applied to metallic nanoparticles." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/418013/.

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This thesis will focus on DFT for calculations of large metallic nanoparticles. It will show new algorithms that were developed for reduced scaling DFT methods for metals; the testing, verification and design of new descriptors for predicting the catalytic activity of metallic nanoparticles; application of large-scale DFT calculations to model nanoparticle sequences to show size and oxygen adsorption coverage trends, and finally the application of these techniques and knowledge to perform a study of oxygen adsorption on real-world, experimentally determined platinum nanoparticles in collaborat

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29

Brooke, Emily. "The growth and characterisation of metallic nanoparticles." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/28121.

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In this thesis, a high vacuum modified magnetron sputtering system has been used to create very clean nanoparticles of silver, gold and nickel. These nanomaterials all have a diverse range of applications, and their usefulness in these applications is dependent upon their unique properties associated with their size and shape. The properties of nanoparticles can degrade and become essentially useless, by coalescence processes and via interaction with environmental contaminants, in particular oxygen. In this thesis, Transmission Electron Microscopy (TEM) techniques have been utilised to explore

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30

Asila, Victoire. "Syntheses of N-Heterocyclic carbenes-stabilized metallic nanoclusters and nanoparticles." Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS087.pdf.

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Dans ce travail nous avons développé une nouvelle synthèse de nanoclusters d’or (AuNCs) stabilisés par des phosphines et des carbènes N-Hétérocycliques (NHCs) grâce à la réduction d’AuClPPh3 par NaBH4 en présence de sels d'imidazolium comme précurseurs de NHC. La plupart des nanoclusters synthétisés sont stabilisés par des PPh3. Cependant, il a été mis en évidence qu'un nanocluster Au11(PPh3)7(NHC)Br2+ très stable est synthétisé. Le suivi du vieillissement des échantillons par spectrométrie de masse par ionisation électrospray (ESI-MS), a montré l'évolution de la composition des suspensions au

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31

Magnone, Heidi J. "Synthesis and characterization of metal oxide nanoparticles." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1762.

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Thesis (M.S.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains vi, 38 p. : ill. Vita. Includes abstract. Includes bibliographical references (p. 35-37).

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32

Martinez, Marrades Ariadna. "3D microscopy by holographic localization of Brownian metallic nanoparticles." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066018/document.

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Nous présentons une nouvelle technique de microscopie stochastique basée sur un montage d'Holographie Digitale pour l'imagerie des distributions d'intensité optique. Nous montrons comment cette technique de champ lointain peut être adaptée afin d'obtenir des images de superrésolution ainsi que de champ proche. En pratique, nous imageons des nanoparticules métalliques en mouvement Brownien dans un liquide, que nous localisons ensuite dans le but de contourner la limite de diffraction. Le mouvement aléatoire des particules nous permet une exploration complète de l'échantillon. Au-delà de la simp

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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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34

Sanderson, Paul. "Measurement and identification of ambient atmospheric metallic nanoparticles." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6426/.

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Physico-chemical characterisation of atmospheric metallic particles collected at six roadside, background and rural sites has been undertaken by multiple methods. Mass-size distributions of total PM mass have been compared between multiple sites and roadside increments calculated in Birmingham, which are found to occur in the size ranges 100-180 nm, 320-560 nm and >1000 nm. Good correlations are observed between Ba, Cu and Fe, but some divergence of sources is evident in small particles. Single-particle analysis by TEM-X-EDS and EELS has classified Fe-dominated particles into two main groups;

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Denisyuk, Andrey Igorevich. "Cathodoluminescence and phase-change functionality of metallic nanoparticles." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/340807/.

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Nanoscale resolution cathodoluminescence (CL) has been used to demonstrate and investigate the functionality of nanoparticle-based components for future nanophotonic phase-change memory and optical antenna applications. An integrated experimental system based on a scanning electron microscope was developed for the fabrication and in situ characterization of nanoparticles. It was equipped with an atomic beam source for gallium nanoparticle growth, a liquid-nitrogen-cooled cryostat to control substrate temperature in the range from 90 to 315 K and a spectroscopic CL detection system to enable th

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36

Young, Gregory. "Metallic nanoparticles as fuel additives in airbreathing combustion." College Park, Md.: University of Maryland, 2007. http://hdl.handle.net/1903/7710.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2007.<br>Thesis research directed by: Dept. of Mechanical Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.

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Fracasso, Guido <1960&gt. "Synthesis and Physical-Chemical characterization of Metallic Nanoparticles." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2895/2/Fracasso_Guido_tesi.pdf.

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The stabilization of nanoparticles against their irreversible particle aggregation and oxidation reactions. is a requirement for further advancement in nanoparticle science and technology. For this reason the research aim on this topic focuses on the synthesis of various metal nanoparticles protected with monolayers containing different reactive head groups and functional tail groups. In this work cuprous bromide nanocrystals haave been synthetized with a diameter of about 20 nanometers according to a new sybthetic method adding dropwise ascorbic acid to a water solution of lithium bromide a

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Fracasso, Guido <1960&gt. "Synthesis and Physical-Chemical characterization of Metallic Nanoparticles." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2895/.

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The stabilization of nanoparticles against their irreversible particle aggregation and oxidation reactions. is a requirement for further advancement in nanoparticle science and technology. For this reason the research aim on this topic focuses on the synthesis of various metal nanoparticles protected with monolayers containing different reactive head groups and functional tail groups. In this work cuprous bromide nanocrystals haave been synthetized with a diameter of about 20 nanometers according to a new sybthetic method adding dropwise ascorbic acid to a water solution of lithium bromide a

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39

Veron, Olivier. "Etude des mécanismes de coloration de verres obtenue par échange ionique Ag+/Na+ et précipitation de nano agrégats métalliques." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00617160.

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L'objectif est d'étudier par la méthode d'échange ionique à l'argent de verres silicatés la coloration induite etla réalisation de guides d'ondes planaires. Deux méthodes de modélisation de l'échange ionique sont présentées pour évaluer les paramètres de l'échange qui sont le coefficient de diffusion, la forme du profil et la mobilité des ions. Cette technique purement thermique permet la réalisation de guides d'onde à gradient d'indice, l'ajout d'un champ électrique permet d'obtenir un profil à saut d'indice. Différentes compositions de verre sont étudiées dans le but de déterminer la variati

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Liakakos, Nikolaos. "Organometallic approach to the growth of metallic magnetic nanoparticles in solution and on substrates." Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0026/document.

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Cette thèse concerne une nouvelle méthode chimique de croissance par germes qui peut produire des assemblés de nanostructures métalliques epitaxiées sur des surfaces macroscopiques cristallines qui agissent comme germes. Cette approche permet d’obtenir des assemblés bien organisées en échelle centimétrique de nanofils métalliques de Co, qui sontmonocristallins, monodisperses de diamètres inferieurs à 10nm et qui ont une orientation perpendiculaire. Ils ont une anisotropie magnétique perpendiculaire et sont intéressantes pour des applications d’enregistrement magnétique à très haute densité. L’

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Lahouari, Adam. "Use of reactive force fields for the simulation of metallic nanoparticles." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS223.

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Les nanoparticules (NPs) sont un pilier de la nanotechnologie grâce à leurs propriétés distinctives. Composées souvent de métaux de transition, elles varient de deux à des milliers d'atomes. Cette thèse explore la simulation de ces nanoparticules, en se concentrant sur l'or, l'argent et le cuivre, avec des applications comme l'argent antibactérien ou l'or anticancéreux. Les ions argent interagissent avec l'ADN et la mitochondrie des bactéries, mais une concentration élevée peut être nocive. L'utilisation du thiol stabilise cette interaction en formant une monocouche auto-assemblée dense sur la

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Vedraine, Sylvain. "Intégration de nanostructures plasmoniques au sein de dispositifs photovoltaïques organiques : étude numérique et expérimentale." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00799088.

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Les cellules solaires en couches minces permettent de produire de l'énergie à bas-coût et sans émission de gaz à effet de serre. Dans le but de réaliser des dispositifs toujours plus performants, nous étudions l'impact de l'intégration de nanostructures métalliques (NSs) au sein de cellules solaires organiques (CSO). Ces NSs peuvent alors générer des effets diffusifs et des résonances issues de plasmons de surface. A l'aide d'un modèle numérique FDTD, nous démontrons que l'ingénierie plasmonique peut servir à augmenter l'absorption dans le matériau photoactif tout en limitant l'énergie perdue

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Cant, Nicola Elizabeth. "Electrostatic self assembly of multilayer films incorporating metallic nanoparticles." Thesis, University of Leeds, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275671.

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Davis, Jack B. A. "Elucidating the structures and catalytic properties of metallic nanoparticles." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6297/.

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The publications contained within this thesis present the application and development of computational methods for the study of metallic nanoparticles and nanoalloys. Principally these studies are dedicated to their structural characterisation and their interactions with small molecules; vital first steps toward understanding their role in key catalytic processes. Publications have also assessed the applicability of statistical mechanical methods and dispersion corrected DFT to these studies. Palladium-iridium nanoalloys, which are under current investigation for their catalytic properties, ar

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Smith, Sarah. "Synthesis and Characterization of Metallic Nanoparticles for Catalytic Applications." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4803.

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In recent years, research has focused on reducing the cost of catalysts in a variety of ways including using less expensive materials, improving the synthetic method, and increasing the catalytic activity, recovery, and recyclability. Typically with nanoparticles, the size, shape, composition, and surface coating have an effect on catalytic activity.1-2 In this work, we focused on reducing the cost of precious metal based catalysts by altering the synthetic methods. One way to lower the cost of synthesizing precious metal nanoparticles is by debasing the precious metal with a second cheaper mo

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Gu, Sasa. "Catalytic activity analysis of metallic nanoparticles by model reactions." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19297.

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In dieser Arbeit wurden zwei katalytische Modellreaktionen studiert. Zunächst die katalytische Reduktion von p-Nitrophenol (Nip) mit Natriumborhydrid (BH_4^-). Diese verläuft entlang der direkten Route: Dabei wird Nip über p-Hydroxylaminophenol (Hx) zum Produkt p-Aminophenol (Amp) reduziert. Ein kinetisches Modell wird vorgestellt, dass die Reaktion auf Basis des Langmuir-Hinshelwood (LH) Mechanismus beschreibt. Die Lösung der Gleichungen gibt die Nip Konzentration als Funktion der Zeit, welche direkt mit den experimentellen Daten verglichen werden kann. Werden als Katalysator auf sphärischen

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Wunder, Stefanie. "Synthesis, characterization and catalytic activity of immobilized metallic nanoparticles." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16752.

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In dieser Arbeit wurden Gold- und PlatinNanopartikel in sphärischen Polyelektolyt-Bürsten (SPB) synthetisiert. Diese wurden zu mechanistischen Untersuchungen der p-Nitrophenol-Reduktion mittels Natriumborhydrid herangezogen. Dabei konnte der Mechanismus der Reaktion auf der Oberfläche der Nanopartikel aufgeklärt werden. Die Reaktion folgt einem Langmuir Hinshelwood (LH) Mechanismus. Hierbei adsorbieren beide Edukte auf die Oberfläche, bevor sie im zu p-Aminophenol umgesetzt werden. Nach der Reaktion desorbiert das Reaktionsprodukt. Mittels des LH Modells konnten für verschiedene Temperaturen d

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Mazzaro, Raffaello <1988&gt. "Graphene and Semicondutor or Metallic Nanoparticles for Energy Conversion." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/5987/1/Mazzaro_Raffaello_tesi.pdf.

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The purpose of the present PhD thesis is to investigate the properties of innovative nano- materials with respect to the conversion of renewable energies to electrical and chemical energy. The materials have been synthesized and characterized by means of a wide spectrum of morphological, compositional and photophysical techniques, in order to get an insight into the correlation between the properties of each material and the activity towards different energy conversion applications. Two main topics are addressed: in the first part of the thesis the light harvesting in pyrene functionalized sil

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Mazzaro, Raffaello <1988&gt. "Graphene and Semicondutor or Metallic Nanoparticles for Energy Conversion." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/5987/.

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The purpose of the present PhD thesis is to investigate the properties of innovative nano- materials with respect to the conversion of renewable energies to electrical and chemical energy. The materials have been synthesized and characterized by means of a wide spectrum of morphological, compositional and photophysical techniques, in order to get an insight into the correlation between the properties of each material and the activity towards different energy conversion applications. Two main topics are addressed: in the first part of the thesis the light harvesting in pyrene functionalized sil

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Fung, Dat-shun Dixon, and 馮達信. "Performance improvement of organic solar cells incorporated with metallic nanoparticles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47849794.

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Organic solar cells (OSCs) have shown great promise in becoming the next generation of renewable energy due to its low cost, simple manufacturing process and flexibility. A method of efficiency improvement in OSCs is by incorporating metallic nanoparticles (NPs). While various reports have reported that incorporation of NPs improve OSC efficiencies due to the Localized Surface Plasmon Resonance (LSPR) effect, the investigations have lacked depth and a detailed investigation is necessary to fully understand the device mechanisms of these OSCs. In this thesis, we first investigate OSCs i

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