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Dissertations / Theses on the topic 'Catalytic nanoparticles'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Tabor, Christopher Eugene. "Some optical and catalytic properties of metal nanoparticles." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/31794.

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Thesis (Ph.D)--Chemistry and Biochemistry, Georgia Institute of Technology, 2010.<br>Committee Chair: El-Sayed, Mostafa; Committee Member: Perry, Joseph; Committee Member: Wang, Zhong; Committee Member: Whetten, Robert; Committee Member: Zhang, John. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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2

Zhang, Huan Ph D. Massachusetts Institute of Technology. "Preparation and applications of catalytic magnetic nanoparticles." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/46672.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2009.<br>Includes bibliographical references.<br>It is critical to decontaminate organophosphate compounds in large scale economically, including OP pesticides in groundwater system and chemical nerve agents on the battle field. Homogeneous or micellar decomposition systems with various nucleophiles improve reaction rates significantly without affording the recovery and reuse of the nucleophiles. This research focuses on developing functional magnetic particles to carry strong [alpha]--nucleophilic groups, w

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3

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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4

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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5

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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6

Bamford, Rebecca. "Biopolymer supports for metal nanoparticles in catalytic applications." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675702.

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Silver nanoparticles (sub 10 nm), supported on, or in, cellulose, have been demonstrated to be well stabilised and immobilised during application in a model continuous reaction: the reduction of 4-nitrophenol (4-NP) to 4-aminophenol with sodium borohydride. The production of these silver nanoparticles (NP), within the cellulose supports, was carried out by either in situ reduction of silver precursors absorbed into the preformed cellulose supports, or, by inclusion of ex situ synthesised NPs (prepared in DMSO solutions) in the dissolution of cellulose and trapping upon subsequent coagulation o

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7

Ren, Chenhao. "Investigating Catalytic Selectivity of Nanoparticles encapsulated in MOFs:." Thesis, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109074.

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Thesis advisor: Chia-kuang Tsung<br>Thesis advisor: Dunwei Wang<br>Coating porous materials is a potential pathway to improve Catalytic performance of heterogeneous catalysts. The unique properties of Metal organic frameworks (MOFs) like huge surface area, long range order and high tenability make them promising coating materials. However, two traditional MOF encapsulation methods have their own issues. Herein, we synthesized Pt/Pd metal nanoparticles @UiO-66-NH2 via a one-pot in situ method which has good control of nanoparticles size while avoids the introduction of capping agent. The cataly

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8

Dylla, Anthony Greg. "Synthesis, characterization and catalytic properties of bimetallic nanoparticles." College Park, Md.: University of Maryland, 2009. http://hdl.handle.net/1903/9609.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2009.<br>Thesis research directed by: Dept. of Chemistry and Biochemistry. 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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9

Bocelli, Ludovica. "Catalytic decomposition of formic acid using supported metal nanoparticles." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11929/.

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Upgrade of hydrogen to valuable fuel is a central topic in modern research due to its high availability and low price. For the difficulties in hydrogen storage, different pathways are still under investigation. A promising way is in the liquid-phase chemical hydrogen storage materials, because they can lead to greener transformation processes with the on line development of hydrogen for fuel cells. The aim of my work was the optimization of catalysts for the decomposition of formic acid made by sol immobilisation method (a typical colloidal method). Formic acid was selected because of the foll

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10

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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11

Ranjbar, Rizi Sara. "Magnetic nanoparticles as a versatile platform for catalytic applications." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/399448.

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Aquesta tesi s'ha centrat en l'ús de nanopartícules magnètiques (MNPS) en catàlisi. Aquestes permeten una recuperació fàcil del catalitzador després de la reacció, el que els fa una eina interessant per a ser utilitzada en processos a gran escala. A més, la modificació de la superfície de les nanopartícules amb diferents linkers ens va donar l'oportunitat d'ancorar una varietat de organocatalitzadors, donant lloc a materials catalítics basats en MNPs. En el primer projecte, dos nous materials híbrids basats en carragenà i MNPs van ser desenvolupats i provats en l'addició de Michael d'aldehids

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12

Huang, Xing. "Structure and Catalytic Properties of Ultra-Small Ceria Nanoparticles." UKnowledge, 2014. http://uknowledge.uky.edu/cme_etds/25.

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Cerium dioxide (ceria) is an excellent catalytic material due to its ability to both facilitate oxidation/reduction reactions as well as store/release oxygen as an oxygen buffer. The traditional approach to assess and improve ceria's catalytic behavior focuses on how efficiently O-vacancies can be generated and/or annihilated within the material, and how to extend established understandings of "bulk" ceria to further explain the greatly enhanced catalytic behavior of ultra-small ceria nanoparticles (uCNPs) with sizes less than 10 nm. Here, using density functional theory (DFT) calculations, we

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13

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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14

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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Yang, Qifeng. "Atom probe tomography research on catalytic alloys and nanoparticles." Thesis, University of Oxford, 2018. http://ora.ox.ac.uk/objects/uuid:f3acdf37-3d23-4893-a4de-12e81712157a.

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Catalyst is a key component in the chemical industry, with more than 90% of total chemical products reliant on their use. However, the working mechanisms are in many cases still not fully understood. For heterogeneous catalysts, in which the reactions normally occur on solid phase materials, a better understanding of the catalytic surfaces, and how they evolve under reactive environments is recognised as the next step forward in the field. This work presents a study utilising atom probe tomography (APT), combined with an in-situ reaction cell, to understand the initial oxidation processes of c

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16

Ramezani-Dakhel, Hadi. "Bioengineered Metal Nanoparticles: Shape Control, Structure, and Catalytic Functionality." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1426184509.

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17

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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18

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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19

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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20

Tsang, Kwok-ying. "Preparation of supported Pt-based mixed nanoparticles and their catalytic properties." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39634188.

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Tsang, Kwok-ying, and 曾幗瑛. "Preparation of supported Pt-based mixed nanoparticles and their catalytic properties." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39634188.

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22

Sharma, Kamal Nayan. "Chalcogenated n-heterocycles based ligands in catalytic activation and nanoparticles synthesis." Thesis, IIT Delhi, 2015. http://localhost:8080/iit/handle/2074/6665.

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23

Serpell, Christopher J. "Imidazole-based ligands for anion recognition and catalytic metal nanoparticles." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533879.

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24

Covone, Simon Armando Mostafa. "Synthesis, structure, and catalytic properties of size-selected platinum nanoparticles." Master's thesis, University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4656.

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The use of heterogeneous catalysis is well established in chemical synthesis, energy, and environmental engineering applications. Supported Pt nanoparticles have been widely reported to act as catalysts in a vast number of chemical reactions. In this report, the performance of Pt/ZrO2 nanocatalyst for the decomposition of methanol, ethanol, 2-propanol, and 2-butanol is investigated. The potential of each alcohol for the production of H2 and other relevant products in the presence of a catalyst is studied. All the alcohols studied show some decomposition activity below 200[degrees]C which incre

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25

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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Anderson, Amanda E. "Strategic immobilisation of catalytic metal nanoparticles in metal-organic frameworks." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/10816.

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This thesis describes the synthesis, characterisation and catalytic testing of multifunctional immobilised metal nanoparticle in metal-organic framework (MOF) materials. Combining the activity of metal nanoparticles with the porosity and Lewis acidity of metal-organic frameworks provides a single catalytic material which can perform multi-step reactions. Strategies to immobilise the metal nanoparticles within the metal-organic frameworks have been investigated. Immobilisation has been achieved by applying three different methodologies. First, deposition of metal nanoparticle precursors within

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Cabaj, Maciej. "Preparation, characterisation and catalytic activity of palladium, silver and silver-based nanoparticles." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648133.

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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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Wunsch, Benjamin H. (Benjamin Hardy). "Investigation of ordered shell nanoparticles as catalytic platforms for organic synthesis." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50527.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2009.<br>Includes bibliographical references.<br>By observing the molecular structure of nature, the field of nanotechnology is exploring the significant versatility and complexity of the local, molecular environment. Through the careful positioning of the components of atoms and molecules into well-defined patterns or structures, unique properties and functions can be developed that are not obtainable by the basic components alone. This structure of the local environment is deeply important to

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Wakisaka, Takuo. "Rational Syntheses of New Metal Nanoparticles and Investigation of Catalytic Activity." Kyoto University, 2020. http://hdl.handle.net/2433/253114.

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31

Abo, Hamed Enass. "Dynamic assembly of active metal nanoparticles : from synthesis to applications in catalytic H₂ production." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708450.

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Maddala, Sai P. "Synthesis of phosphonate functionalized silica nanoparticles for protein immobilization, intracellular protein delivery and catalytic applications." Thesis, Queen Mary, University of London, 2014. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8961.

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Organosilica nanoparticles have attracted a lot of research interest in a variety of areas such as drug delivery and catalysis because of their properties which include high surface area as well as tunable particle and pore size. In particular, nanoparticles with large pore sizes are of great interest because of their potential to host large guest molecules such as proteins and as catalysts. The focus of the work in the thesis was to develop phosphonate functionalized organosilica nanoparticles for biomedical and catalytic applications. Raspberry textured phosphonatesilica nanoparticles denote

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Smith, Stacey Janel. "The Synthesis and Structural Characterization of Metal Oxide Nanoparticles Having Catalytic Applications." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3667.

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Nanotechnology is blossoming into one of the premiere technologies of this century, but the key to its progress lies in developing more efficient nanosynthesis methods. Variations in synthetic technique, however, can cause variations in size, structure, and surface characteristics, thereby altering the physical properties and functionality of the particles. Careful structural characterizations are thus essential for understanding the properties and appropriate applications for particles produced by new synthetic techniques.In this work, a new ‘solvent-deficient’ method is presented for the syn

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Luska, Kylie. "The catalytic application of ionic liquid-stabilized metal nanoparticles and molecular complexes." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110575.

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Ionic liquids (ILs) have gained considerable research attention as potential replacements for volatile organic chemicals (VOCs) based solvents due to their low vapour pressures and ability to be easily recovered and recycled. Research on ILs has revealed such novel properties as: high chemical and thermal stabilities, good gas solubilites, wide windows of electrochemical stability, good electrical conductivities, high ionic mobilities and immiscibilities with some organic solvents and water. The exploitation of these IL properties has expanded the application scope to include: analytics, cat

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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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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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Reina, Tapia Antonio. "Metal nanoparticles stabilized by alkaloids in glycerol : from design to catalytic applications." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30160.

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Les nanoparticules métalliques (MNPs) ont un grand succès dans les dernières décennies dû à la variété d'applications dans différents domaines (microélectronique, matériaux, catalyse). Mis à part les solvants organiques, les liquides ioniques, l'eau, le CO2 supercritique et les polyols, en particulier le glycérol, ont démontré leur capacité à stabiliser et immobiliser les nanoparticules métalliques. Ces milieux évitent l'agglomération des MNPs et facilitent leur recyclage. Des nanoparticules de Pd(0) et Ni(0) dans le glycérol, sphériques, petites en taille et bien dispersées, ont été synthétis

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Kumar, A. "Synthesis of precious metal nanoparticles in mesoporous solids and their catalytic properties." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2011. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3791.

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Strossi, Pedrolo Débora Regina. "Synthesis of metal-zeolite composite materials for bifunctional catalytic reactions." Thesis, Université de Lille (2018-2021), 2021. https://pepite-depot.univ-lille.fr/LIBRE/EDSMRE/2021/2021LILUR065.pdf.

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Les catalyseurs à base de zéolite ont été largement utilisés dans la conversion de la biomasse. Les rendements catalytiques des produits recherchés sont fortement limités en raison de la taille relativement petite des pores dans les zéolithes et la préparation du catalyseur par imprégnation conduit généralement à des nanoparticules métalliques relativement grosses et à un faible contact entre les sites métalliques et acides. Le but de ce travail est la conception de catalyseurs nanocomposites métal-zéolithe contenant des nanoparticules de ruthénium uniformément réparties dans les zéolithes hié

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Besostri, Francesca. "Deposition of metal nanoparticles on magnetic nanobeads and evaluation of their catalytic activity." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/396175.

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El present manuscrit presenta estudis científics que versen sobre la síntesi i aplicacions en catàlisi de nanopartícules metàl·liques (Pd, Pt, Au, Ni) dipositades sobre nanoesferes de Co i Fe2O3. En primer lloc s’ha estudiat l’activitat en acoblament creuat de tipus Suzuki-Miyaura d’un catalitzador format per nanopartícules de pal·ladi dipositades a la superfície de nanoesferes de Co recobertes de carboni. S’ha observat alta activitat catalítica per a l’acoblament d’àcid fenilborònic amb iodurs i bromurs d’aril, emprant càrregues de catalitzador baixes i temps de reacció curts. També s’ha estu

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Hurst, Eleanor Catherine. "Metal nanoparticles protected by phosphines and N-heterocyclic carbenes preparation and catalytic applications." Thesis, University of York, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533530.

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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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MASTRONARDI, VALENTINA. "Size- and shape-controlled platinum and palladium nanoparticles for catalytic and biomedical applications." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1046749.

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The aim of this doctoral project has been centered on the development of innovative green synthetic methods able to govern the key physico-chemical properties of noble metal nanoparticles (NPs). To fully uncover the potential of metallic NPs, it is necessary to finely control the shape of nanomaterials while keeping the ultra-small characteristics, in order to achieve superior efficiency (per mass unit), selectivity and enhanced activity in catalytic processes. Size and shape of the nanomaterial together with the capping agents govern the surface properties and all the processes happening at

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Croy, Jason Robert. "Supported mono and bimetallic platinum and iron nanoparticles electronic, structural, catalytic, and vibrational properties." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4652.

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Catalysis technologies are among the most important in the modern world. They are instrumental in the realization of a variety of products and processes including chemicals, polymers, foods, pharmaceuticals, fuels, and fuel cells. As such, interest in the catalysts that drive these processes is ongoing, and basic research has led to significant advances in the field, including the production of more environmentally friendly catalysts that can be tuned at the molecular/atomic level. However, there are many factors which influence the performance of a catalyst and many unanswered questions still

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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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Bhaduri, Gaurav Ashok. "Catalytic enhancement of hydration of CO₂ using nickel nanoparticles for carbon capture and storage." Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/4135.

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The capture and storage of atmospheric CO2 as mineral carbonates, is one of the safest ways to combat global warming. The slow CO2 hydration rate is one limitation of the mineralization process. The current study presents the discovery of nickel nanoparticles (NiNPs) as a catalyst for enhancing the rate of CO2 hydration for mineralization carbon capture and storage. The NiNPs at an optimum concentration of 30 ppm, increased the saturation concentration by three folds as compared with deionized water alone. The mechanism of the reaction on NiNPs surface is also proposed. The kinetics of catalys

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Leteba, Gerard Malefane. "Synthesis, characterization and catalytic investigations of Pt-based binary (bimetallic) and ternary (trimetallic) nanoparticles." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22816.

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This work tests the hypothesis that nanoparticles of 75 at.% platinum (Pt) composition and anisotropic morphology, will outperform standard catalysts in (PEMFC) hydrogen fuel cells. A survey of the scientific literature on this topic is first presented. The synthetic strategies which were developed for the preparation of novel Pt-based binary (bimetallic) and ternary (trimetallic) nanoparticles, containing nickel (Ni), cobalt (Co) and/or vanadium (V), are then described. The synthesis protocols for solution-grown colloidal nanoparticles all required the heat-up of a chemical mixture (of metal

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