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Dissertations / Theses on the topic 'Graphite oxide nanoparticles'

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Published: 4 June 2021
Last updated: 8 February 2022

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1

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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2

Alshammari, Hanaa Ali. "Heating Power of Coated FeCoV Magnetic Nanoparticles." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1464477896.

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3

Chu, Hua-Wei. "Development of solution-processed methods for graphene synthesis and device fabrication." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44738.

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Various solution-processed methods have been employed in this work. For the synthesis of graphene, a chemical exfoliation method has been used to generate large graphene flakes in the solution phase. In addition, chemical or electro polymerization has been used for synthesizing polyanthracene, which tends to form graphene nanoribbon through cyclodehydrogenation. For the device fabrication, graphene oxide (GO) thin films were deposited from solution phase on the vapor-silanzed aminosilane surface to make semiconducting active layer or conducting electrodes. Gold nanoparticles (AuNPs) were selec
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4

Watson, Venroy George. "Decoration of Graphene Oxide with Silver Nanoparticles and Controlling the Silver Nanoparticle Loading on Graphene Oxide." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1396879714.

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5

Costa, Sara Ferreira da. "Funcionalização do óxido de grafite com GLYMO e sua utilização como reforço em nanocompósitos de matriz epoxídica." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/1685.

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Made available in DSpace on 2016-12-08T17:19:27Z (GMT). No. of bitstreams: 1 Sara F Da Costa.pdf: 4048373 bytes, checksum: 81bb7b57c2e425cdcfcc5039f74fae1f (MD5) Previous issue date: 2015-07-27<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The change of mechanical properties of epoxy resins after the addition of nanoparticles (f. ex. graphite oxide) depends on its concentration, state of dispersion and interaction with the polymer matrix. To improve dispersion and avoid agglomeration of the GO nanoplatelets, due to van der Waals interactions, these nanoparticles can be fu
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6

Moraes, Ana Carolina Mazarin de 1983. "Graphene oxide and graphene oxide functionalized with silver nanoparticles : antibacterial activity and polymeric composites applications." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249034.

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Orientador: Oswaldo Luiz Alves<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química<br>Made available in DSpace on 2018-08-27T15:35:46Z (GMT). No. of bitstreams: 1 Moraes_AnaCarolinaMazarinde_D.pdf: 5504556 bytes, checksum: ff8566e313e82701925549e2ecd544ab (MD5) Previous issue date: 2015<br>Resumo: O óxido de grafeno (GO) é uma forma quimicamente modificada de grafeno que possui grupos funcionais contendo oxigênio (epóxi, carboxila, carbonila, e hidroxila) distribuídos sobre a base e as bordas de suas folhas. Devido à abundância dos grupamentos oxigenados, o GO tem s
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7

Karna, Sanjay K. "Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849637/.

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A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to
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8

Liu, Xiao Jie. "Synthesis of magnetic nanoparticles and carbon based nanohybrid materials for biomedical and energy application." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF055/document.

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Les travaux de cette thèse ont été consacrés à la synthèse de nanoparticules magnétiques d'oxyde de fer et d'oxyde de cobalt et de nanoparticules coeur-coquille constituées d'un coeur d'oxyde de fer recouvert d'oxyde de cobalt et à l'élaboration de nanomatériaux - composites nanostructures carbonées/nanoparticules d'oxyde métallique - pour des applications dans le domaine biomédical et celui de l'énergie. Pour la synthèse des NPs, la forme et la taille des NPs sont fortement dépendantes des conditions de réaction (nature des ligands, des solvants, température de réaction ... ) , ce qui affecte
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9

Karna, Sanjay K. "Enhancement of Light Emission from Metal Nanoparticles Embedded Graphene Oxide." Thesis, University of North Texas, 2005. https://digital.library.unt.edu/ark:/67531/metadc849637/.

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A fully oxidized state of graphene behaves as a pure insulating while a pristine graphene behaves as a pure conducting. The in-between oxide state in graphene which is the controlled state of oxide behaves as a semiconducting. This is the key condition for tuning optical band gap for the better light emitting property. The controlling method of oxide in graphene structure is known as reduction which is the mixed state of sp2 and sp3 hybrid state in graphene structure. sp2 hybridized domains correspond to pure carbon-carbon bond i.e. pristine graphene while sp3 hybridized domains correspond to
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10

Dywili, Nomxolisi. "Polyanilino-graphene oxide intercalated with platinum group metal nanocomposites, for application as novel supercapacitor materials." University of the Western Cape, 2014. http://hdl.handle.net/11394/4453.

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>Magister Scientiae - MSc<br>Supercapacitors are one of the important subjects concerning energy storage which has proven to be a challenge in this country. Currently, the electrodes of most commercial supercapacitor are made of carbon which is known to be inexpensive and has high resistance to corrosion. These carbon based supercapacitors operate under EDLC. They offer fast charging/discharging rates and have the ability to sustain millions of cycles without degrading. With their high power densities, they bridge the gap between batteries which offer high energy densities but are slow in char
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11

Squillaci, Marco. "Supramolecular engineering of optoelectronic sensing devices." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF051/document.

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Cette thèse explore l’utilisation des principes de la chimie supramoléculaire afin de fabriquer des dispositifs senseurs de gaz novateurs et à haute performance, avec une lecture (opto)-électronique. Parmi les différentes sections, divers échafaudages tels que des réseaux hybrides bi- et tridimensionnels de particules d’or et des nanofibres supramoléculaires sont utilisés comme matériaux actifs pour la détection quantitative de l’humidité. Au sein de la dernière section, des couches 2D d’oxyde de graphène sont fabriquées par exposition à un laser IR, puis comme validation de principe, exploité
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12

Lagier, Laura. "Ecotoxicité comparative de l'oxyde de graphène et d'autres nanoparticules de carbone chez des organismes aquatiques modèles : d'une évaluation en conditions monospécifiques vers l'étude d'une chaîne trophique expérimentale." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30270/document.

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L'écotoxicité de différentes nanoparticules de carbone (NPC) a été évaluée chez des organismes aquatiques, en particulier chez Xenopus laevis. Il a été montré que la surface des NPC est le paramètre le plus pertinent pour décrire l'inhibition de croissance chez le xénope, indépendamment de leur forme allotropique et de leur état de dispersion. L'induction des micronoyaux a aussi été étudiée chez le xénope, et l'oxyde de graphène (GO) s'est révélé génotoxique à faible dose, résultat corroboré par l'étude de l'expression des gènes. Les mécanismes de toxicité impliqués seraient notamment liés aux
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13

Mgwili, Phelisa Yonela. "Graphenated organic nanoparticles immunosensors for the detection of TB biomarkers." University of the Western Cape, 2017. http://hdl.handle.net/11394/6355.

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Magister Scientiae - MSc (Chemistry)<br>Pulmonary Tuberculosis (TB) a disease second to HIV/AIDS is a global health problem that arises in two states; as an active state and as a latent state. Diagnosis of active TB is tedious and requires expensive procedures since there is no recognizable method for the sole detection of active TB. The current diagnosis consists of chest X-rays and multiple sputum cultures used for acid-fast bacilli detection. The TB diagnosis of children is particularly difficult which further complicates the diagnosis. Thus, rapid identification of this pathogen is importa
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14

Pan, Hanqing. "Heat-induced reshaping and coarsening of metal nanoparticle-graphene oxide hybrids." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1526943.

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<p> Glutathione-capped gold nanoparticles of size 1, 3, and 10 nm, CTAB-stabilized gold nanorods, as well as ro-carboxylate-functionalized palladium nanoparticles were synthesized and self-assembled onto graphene oxide to study their coarsening or reshaping behaviors upon heating at different temperatures ranging from 50 &deg;C to 300 &deg;C. These engineered nanoparticle- or nanorod-graphene oxide hybrid materials were studied by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), Fourier-transform infrared (FTIR) spectroscopy, and UV-Vis spectroscopy.</p><p> The spher
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15

Signorini, Virginia. "Hybrid polymer-based membranes with graphene oxide nanoparticles for carbon dioxide capture." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The project focuses on the development of hybrid polymer/inorganic membranes with aligned nanoparticles within the polymeric matrix for CO2 separation membrane fabrication. The investigated polymer is the PEG3A, while the inorganic particles are the Graphene Oxide (GO). The addition of the GO nanoparticles is done due to a UV-light cross-linking reaction between the polymer, the polymer solvent and the solvent in which nanoparticles are dispersed in different concentration. The solvents used for the incorporation of GO into the membrane matrix are Water, Ethanol and Acetone since these filler
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16

Jaggernauth, Aneeta. "Polymer funcionalization of nano-graphene oxide by molecular layer deposition." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14832.

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Mestrado em Engenharia de Materiais<br>O presente trabalho aborda o processo de funcionalização por via seca de nanopartículas de óxido de grafeno (nano-GO) visando o estabelecimento de ligações a polietilenoglicol (PEG) na sua superfície. Atualmente utilizam-se métodos químicos de funcionalização por via húmida com esta finalidade, no entanto são demorados e resultam em perdas significativas de amostra. O trabalho foi realizado em duas fases: o GO foi primeiramente sintetizado em forma de filme e pó utilizando um método “Hummers” modificado, sendo caracterizado por FTIR, SEM e DLS; e
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17

Tshoko, Siphokazi. "Spectroelectrochemical graphene-silver/zinc oxide nanoparticulate phenotype biosensors for ethambutol and pyrazinamide." University of the Western Cape, 2019. http://hdl.handle.net/11394/6842.

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>Magister Scientiae - MSc<br>Tuberculosis (TB), a deadly disease second to HIV/AIDS, is a global health problem. Diagnosis of active tuberculosis is tedious and requires expensive procedures since there is no recognizable method for sole detection of active TB. Although this is a deadly disease, treatment drug toxicity is also an issue that also causes fatalities in diagnosed patients. Therefore, a rapid sensitive and specific diagnostic method is imperative for TB drug management. In this study spectroscopic and/or electrochemical biosensors were developed for the detection and quantifi
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18

Pacltová, Klára. "Ověřování vlastností betonů s nanočásticemi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392361.

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This diploma thesis deals with the influence of addition of carbon nanoparticles on cement composites. The theoretical part of the diploma thesis is focused on the research of information about carbon nanoparticles, more precisely about carbon nanotubes and graphene oxide. There are summarized methods of dispersing carbon nanotubes and their effects on cement composites. The practical part follows the theoretical part of the research. In the first phase, the correct technique of graphene oxide dispersion was verified. Subsequently, the effects of graphene oxide on the mechanical properties of
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19

Dywili, Nomxolisi Ruth. "Development of Metal Nanoparticle-Doped Polyanilino-Graphene Oxide High Performance Supercapacitor Cells." University of the Western Cape, 2018. http://hdl.handle.net/11394/6251.

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Philosophiae Doctor - PhD (Chemistry)<br>Supercapacitors, also known as ultracapacitors or electrochemical capacitors, are considered one of the most important subjects concerning electricity or energy storage which has proven to be problematic for South Africa. In this work, graphene oxide (GO) was supported with platinum, silver and copper nanoparticles anchored with dodecylbenzenesulphonic acid (DBSA) doped polyaniline (PANI) to form nanocomposites. Their properties were investigated with different characterization techniques. The high resolution transmission electron microscopy (HRTE
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20

Gonzalez, Ortiz Dánae. "DEVELOPMENT OF POROUS MEMBRANES FROM EMULSIONS STABILIZED BY 2D NANOPARTICLES (h-BNNS)." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2018. http://www.theses.fr/2018ENCM0006/document.

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De nos jours, les émulsions stabilisées par adsorption de particules colloïdales à l'interface liquide-liquide (émulsions de Pickering) présentent un intérêt pour une grande variété d'applications allant des produits pharmaceutiques ou alimentaires aux modèles pour la préparation de nouveaux matériaux. Dans cette thèse, des émulsions huile-dans-eau (H/E) et eau-dans-huile (E/H) ont été efficacement stabilisées grâce à des particules inorganiques colloïdales (oxyde de graphène (GO) et nanofeuillets de nitrure de bore (h-BNNS)). L'adsorption de particules à l'interface huile-eau est induite par
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21

Bourourou, Mariem. "Conception des bioélectrodes enzymatiques à base de nanomatériaux dans des piles à combustible et des capteurs." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI043/document.

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Le travail présenté dans ce manuscrit est une contribution à la recherche sur la mise en forme d'une nouvelle classe de bioélectrodes nanostructurées, principalement à base de nanotubes de carbone (NTCs). L'oxyde de graphène (GO) a été également évalué pour des applications bioélectrochimiques. Les procédés de fabrication développés autorisent l'ajout d'additifs tels que des médiateurs et des polymères. L'optimisation de la connexion enzymatique de la laccase pour la réduction de l'O2 sur des matrices de nanotubes de carbone ainsi que de la polyphénol oxydase (PPO) pour la détection électrochi
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22

Algadi, Hend Emhemed. "Effects of graphene oxide nanoparticles on the immune system biomarkers produced by RAW 264.7." University of the Western Cape, 2019. http://hdl.handle.net/11394/6983.

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Magister Scientiae (Medical Bioscience) - MSc(MBS)<br>Graphene oxide (GO) is a single carbon layer, oxygen bearing graphene derivative, containing hydroxyl and carboxyl groups. Graphene oxide nanoparticles (GONPs) are promising nanomaterials for a variety of applications such as electrochemical analysis, adsorption of biomolecules, biosensors and drug and vaccine delivery systems. While these newly engineered nanoparticles hold great potential for developments in industry and medicine, the widespread use of these material will inevitably result in GO residues in the environment where they coul
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Modarres, Mohammad Hadi. "Reduced graphene oxide nanoparticle hybrids and their assembly for lithium-ion battery anodes." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277144.

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Lithium-ion batteries (LIBs) are an integral part of consumer electronic devices and electric vehicles. There is a growing need for LIBs with higher capacity, rate performance and cycling stability. At the anode electrode these challenges are being addressed for instance by utilising materials with higher theoretical capacity compared to graphite (372 mAh/g) or by optimising the morphology of materials through nanostructuring of the electrode. In this thesis the former is investigated by synthesising a reduced graphene oxide (rGO) tin sulphide (SnS2) hybrid, and the latter by self-assembly of
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24

Vacchi, Isabella Anna. "Controlled chemical functionalization of graphene oxide." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF053.

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L’oxyde de graphène est un nanomatériau prometteur grâce à ses caractéristiques physicochimiques. Cependant, jusqu’à aujourd’hui, sa composition exacte reste encore inconnue. Ceci est dû à la complexité et au caractère non-stoechiométrique de ce matériau. Nous avons commencé par étudier sa composition de surface et sa réactivité. Nous avons utilisé des échantillons synthétisés de manière différente pour explorer la relation entre la méthode de synthèse et la composition de surface. En outre, nous avons préparé un dérivé fonctionnalisé avec un agent chélatant de radionucléides pour étudier sa b
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25

ALRASHED, MAHER M. "ORGANIC/INORGANIC HYBRID COATINGS FOR ANTICORROSION APPLICATIONS." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491226580793534.

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26

Cazayus-Claverie, Emmanuelle. "Matériaux pour les batteries Li-AIR : nouvelles approches vers des nano-hétérostructures spinelles/graphène pour électrode à air." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066508/document.

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Ces travaux de thèse portent sur la synthèse et la caractérisation de nanoparticules d’oxyde spinelle à base de cobalt, déposée à la surface de feuillets d’oxyde de graphène réduit. Ces nanocomposites ont pour but de servir de catalyseurs bifonctionnels intégrés à l’électrode à air des batteries lithium-air. La particularité des synthèses présentées repose sur le chauffage micro-onde des précurseurs en milieu aqueux entre 100 et 200 °C. Cette approche originale de chimie douce permet en outre la création de l’interface entre les nanoparticules d’oxyde et les feuillets de graphène directement p
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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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Chunder, Anindarupa. "FABRICATION OF FUNCTIONAL NANOSTRUCTURES USING POLYELECTROLYTE NANOCOMPOSITES AND REDUCED GRAPHENE OXIDE ASSEMBLIES." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3082.

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A wide variety of nanomaterials ranging from polymer assemblies to organic and inorganic nanostructures (particles, wires, rods etc) have been actively pursued in recent years for various applications. The synthesis route of these nanomaterials had been driven through two fundamental approaches -  Top down and  Bottom up . The key aspect of their application remained in the ability to make the nanomaterials suitable for targeted location by manipulating their structure and functionalizing with active target groups. Functional nanomaterials like polyelectrolyte based multilayered thin film
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Moussa, Hatem. "Influence de l’association de quantum dots ZnO avec des ions Cu²+ sur leur (photo)toxicité. Nouveaux matériaux ZnO/rGO pour la photocatalyse solaire." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0036/document.

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Ces dernières années, les énormes progrès réalisés en nanotechnologie ainsi qu’en science des matériaux ont conduit à la préparation de nombreuses nouvelles nanoparticules sans réellement connaître l’ensemble des propriétés associées à leurs dimensions. La première partie de notre travail vise à évaluer les risques et les problèmes associés aux nanomatériaux, en termes de toxicité, en utilisant des nanoparticules de ZnO. Nous avons tout d’abord étudié la capacité de ces nanoparticules à générer des espèces réactives d’oxygènes (EROs) sous irradiation UV en utilisant trois types des quantum dot
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Wang, Qi. "Carbon-based materials : preparation, functionalization and applications." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10156/document.

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Le graphène et ses dérivées ont suscité un grand intérêt au fil des années en raison de leurs propriétés physiques et chimiques exceptionnelles. Pour l'intégration du graphène dans des dispositifs électrochimiques, il est essentiel d'avoir une technique simple, reproductible et contrôlable afin de produire des feuillets de graphène de bonne qualité sur des grandes surfaces. Dans cette optique, l'utilisation d'oxyde de graphène réduit chimiquement (rGO) plutôt que le graphène produit par la technique CVD représente une alternative très prometteuse. Dans cette thèse, nous avons développé différe
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McNamara, Nicholas D. "Sonochemical Synthesis and Characterization of Metal Nanoparticle-Decorated Carbon Supports." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1311690542.

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Azevedo, Joël. "Assemblage contrôlé de graphène et de nanotubes de carbone par transfert de films de tensioactifs pour le photovoltaïque." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00846430.

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Cette thèse est dédiée à l'étude d'une nouvelle méthode de formation de films ultra-minces de nanomatériaux carbonés sur surface. Basée sur le transfert d'un film d'eau stabilisé par des tensioactifs, elle permet notamment la réalisation et l'étude de films de nanotubes de carbone et d'oxyde de graphène (GO) aux propriétés remarquables. L'efficacité de l'approche développée est prouvée au travers de l'ajustement précis des caractéristiques des films. Pour l'assemblage d'objets bidimensionnels cette approche est particulièrement pertinente puisque la planéité des feuillets de GO est conservée q
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Kaminska, Izabela. "Préparation et applications de plateformes à base de nanaoparticules d’or et de graphène." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10003/document.

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Dans ce travail de thèse, de nouvelles méthodes de préparation d’interfaces recouvertes de nanoparticules d’or (Au NPs) et/ou d’oxyde de graphène réduit (rGO) ont été développées. La méthode de dépôt des nanoparticules d’or repose sur la technique dite « three phase junction » ou « jonction à trois phases ». Différentes conditions de dépôt par voltampérométrie et chronoampérométrie ont été utilisées pour optimiser la taille et la forme ainsi que la stabilité de ces nanostructures sur l’électrode. Les propriétés catalytiques des électrodes modifiées par les nanostructures métalliques ainsi obte
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Závacký, Jakub. "Technologie úpravy nanočástic pro zlepšení jejich dispergovatelnosti pro využití v cemtových kompzitech." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2021. http://www.nusl.cz/ntk/nusl-432484.

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The diploma thesis deals with the possibility of using the addition of nanoparticles to improve the properties of cement composites. The theoretical part summarizes the findings of research in this area with a focus on methods of dispersion of nanoparticles and their treatment for use in cement composites. The experimental part focuses on the comparison of methods of dispersion and plasma treatment of reduced graphene oxide (rGO) nanoparticle solutions from the point of view of the agglomeration process. During this work, a method of systematic optical/visual monitoring of sedimentation/agglom
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Šindelek, David. "Využití nanotechnologií pro betony ultravysokých pevností." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372220.

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This diploma thesis deals with the concept of use of nanotechnology for cement composites and UHPC. In the theoretical part of this diploma thesis there are theoretical principles described for successful design of high performance concrete and characteristics of main feedstock and its production. Furthermore, there is a focus on nanoparticles, especially the ones with carbon base in the form of carbon nanotubes CNT, in addition to that, graphenes GN that are new on the market, moreover, graphene oxide GO and its application in cement composites to mechanical characteristics and its durability
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Botero, Carrizosa Sara C. "Synthesis, Characterization, and Properties of Graphene-Based Hybrids with Cobalt Oxides for Electrochemical Energy Storage and Electrocatalytic Glucose Sensing." TopSCHOLAR®, 2017. http://digitalcommons.wku.edu/theses/1941.

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A library of graphene-based hybrid materials was synthesized as novel hybrid electrochemical electrodes for electrochemical energy conversion and storage devices and electrocatalytical sensing namely enzymeless glucose sensing. The materials used were supercapacitive graphene-family nanomaterials (multilayer graphene-MLG; graphene oxide-GO, chemically reduced GO-rGO and electrochemical reduced GOErGO) and pseudocapacitive nanostructured transition metal oxides including cobalt oxide polymorphs (CoO and Co3O4) and cobalt nanoparticles (CoNP). These were combined through physisorption, electrode
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37

Wang, Qian. "Carbon-based materials : application in electrochemical sensing." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10079/document.

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Les nanomatériaux à base de carbone ont suscité un intérêt considérable en raison de leurs applications potentielles dans divers domaines. Ces matériaux sont également considérés comme des matrices idéales pour le développement de capteurs/biocapteurs électrochimiques avec une grande sensibilité. Au cours de ce travail de thèse, on a utilisé des nanotubes de carbone alignés verticalement dopés à l'azote (VA-NCNT), des électrodes d’or modifiées avec des nanofibres de carbone/hydroxyde de cobalt (CNFs/Co(OH)2) par dépôt électrophorétique, ou avec des nanoparticules de cuivre /oxyde de graphène r
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38

Al-Zangana, Shakhawan. "Nano- and micro-particle doped liquid crystal phases." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/nano-and-microparticle-doped-liquid-crystal-phases(31dbb051-7d9c-4780-bda0-d58773846de0).html.

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This thesis presents the investigation of the liquid crystal (LC) - particle suspensions. Particles from nano- to micro-size, spherical to two-dimensional shapes, with different functionality are dispersed into nematic and smectic phases. The aim is to create ordered nanoparticle (NP) assemblies and thereby modify the common properties of the liquid crystal, such as dielectric anisotropy and electro-optical, revealing any interaction between particles and LC properties. It is found that for concentrations (>0.5vol%), the ferroelectric NPs have increased the sensitivity of the nematic liquid cr
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Mendes, Rafael Gregorio. "Synthesis, characterization and toxicological evaluation of carbon-based nanostructures." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-186839.

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The synthesis, characterization and biological evaluation of different graphene-based nanoparticles with potential biomedical applications are explored. The results presented within this work show that eukaryotic cells can respond differently not only to different types of nanoparticles, but also identify slight differences in the morphology of nanoparticles, such as size. This highlights the great importance of the synthesis and thorough characterization of nanoparticles in the design of effective nanoparticle platforms for biological applications. In order to test the influence of morphology
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Anouar, Aicha. "Préparation de matériaux à base de graphène et leur application en catalyse." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/164030.

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[ES] Para abordar los desafíos ambientales, la química y los procesos químicos deben ser más sostenibles. Para ello, el desarrollo de nuevos catalizadores especialmente activos es de suma importancia. En catálisis heterogénea, el grafeno ha surgido recientemente como un excelente candidato desde que fue posible aislarlo a partir del grafito. Sus propiedades únicas han despertado un gran interés para aplicarlo en varios campos, desde el refuerzo de matrices poliméricas hasta el desarrollo de materiales para catálisis. En catálisis, su uso como soporte catalítico o como carbocatalizador es todav
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Mariano, Thiago de Morais [UNESP]. "Desenvolvimento de sensor baseado em polímeros molecularmente impressos para determinação de álcoois superiores em óleo fúsel." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136409.

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Submitted by THIAGO DE MORAIS MARIANO null (thiaguitobatera@gmail.com) on 2016-03-24T18:46:42Z No. of bitstreams: 1 DISSERTAÇÃO-VERSÃO FINAL.pdf: 1116395 bytes, checksum: 647c9edcd2f39b64fa625d689d79f620 (MD5)<br>Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-03-24T19:59:05Z (GMT) No. of bitstreams: 1 mariano_tm_me_araiq.pdf: 1116395 bytes, checksum: 647c9edcd2f39b64fa625d689d79f620 (MD5)<br>Made available in DSpace on 2016-03-24T19:59:05Z (GMT). No. of bitstreams: 1 mariano_tm_me_araiq.pdf: 1116395 bytes, checksum: 647c9edcd2f39b64fa625d689d79
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Loczechin, Aleksandra. "Les nanomatériaux en carbone : des alternatives antibactériennes et antivirales." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1I117.

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La résistance croissante aux antibiotiques et les limitations dans le développement de nouveaux médicaments nécessitent la recherche de stratégies alternatives afin d’éradiquer les infections bactériennes. Des problèmes semblables apparaissent dans le développement de thérapeutiques antivirales, en raison de l’émergence constante de nouveaux virus et leur capacité à contourner les thérapies par des mutations génétiques. Ce travail de recherche examine la potentielle activité antibactérienne et/ou antivirale de nanostructures à base de carbone telles que les nanoparticules de diamant et les poi
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Chien, An-Ting. "Multi-functional PAN based composite fibers." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54304.

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Various nano-fillers can introduce specific functions into polymer and expand their application areas. Myriad properties, such as mechanical, electrical, thermal, or magnetic properties can be combined with original polymer characteristics, including flexible, light weight, and ease of use. These composites can be used to produce multi-functional fibers as the next generation textile or fabrics. In this research, Polyacrylonitrile (PAN) is adopted as the main polymer with different nano-fillers, such as carbon nanotube (CNT), iron oxide nanoparticle, and graphene oxide nanoribbon (GONR). Using
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Maraldi, Vitor Alexandre. "Preparo, caracterização e aplicação eletroanalítica de nanopartículas de pentacianonitrosilferrato(III) de cobre sobre a superfície de óxido de grafeno." Ilha Solteira, 2018. http://hdl.handle.net/11449/157120.

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Orientador: Devaney Ribeiro do Carmo<br>Resumo: Este trabalho apresenta a preparação do óxido de grafeno (OG) através do Método de Hummers Modificado e subsequente modificação química de sua superfície com nanopartículas de pentacianonitrosilferrato(III) de cobre (OGCuNP). Os materiais obtidos foram caracterizados por diferentes técnicas, tais como: Espectroscopia na Região do Infravermelho com Transformada de Fourier, Espectroscopia Raman, Espectroscopia de Fotoelétrons Excitados por Raios-X, Microscopia Eletrônica de Varredura, Microscopia Eletrônica de Transmissão e Difração de Raios-X. O O
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Idier, Jonathan. "Utilisation de nanomatériaux anisotropes pour l'élaboration d'électrodes transparentes conductrices." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0314/document.

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Ce travail de thèse est principalement dédié à la mise en forme et à l’utilisation de nano-objets unidimensionnels comme matériaux d’électrodes transparentes. Les nanofils d’argent font partie des candidats les plus prometteurs pour le remplacement de l’oxyde d’indium-étain, actuellement le plus répandu dans les dispositifs commerciaux. La forte instabilité des nanofils d’argent à l’oxydation est néanmoins un problème critique puisque les électrodes deviennent moins performantes en peu de temps. En premier lieu, la triphénylphosphine a été utilisée comme agent inhibant l’oxydation. Contraireme
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"Synthesis mechanism, phase transfer and optical tracking of iron oxide nanoparticles." Thesis, 2011. http://hdl.handle.net/1911/70395.

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High temperature synthesis of nanocrystals in non-polar solvents typically produces materials with narrow size distribution and high yields. However, the mechanism leading to the preservation of monodispersity on depletion of monomers is not understood, for example, in the case of iron oxide nanoparticles. In our study, it was found that oleic acid, a surfactant added to the mixture of iron precursor and solvent, gradually decomposed to release carbon monoxide at 320°C. This strong reducing gaseous product had a substantial impact on the size distribution of nanocrystals produced. The reduced
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47

Kamble, Vinayak Bhanudas. "Studies on Effect of Defect Doping and Additives on Cr2O3 and SnO2 Based Metal Oxide Semiconductor Gas Sensors." Thesis, 2014. http://hdl.handle.net/2005/3258.

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Metal Oxide (MO)semiconductors are one of the most widely used materials in commercial gas sensor devices. The basic principle of chemoresistive gas sensor operation stems on the high sensitivity of electrical resistance to ambient gaseous conditions. Depending on whether the oxide is "p type" or "n type", the resistance increases (or decrease), when placed in atmosphere containing reducing (or oxidizing) gases. The study of conductometric metal oxide semiconductor gas sensors has dual importance in view of their technological device applications and understanding fundamental MO-gas interactio
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48

Venkatesha, N. "Nanoparticles for Bio-Imaging : Magnetic Resonance Imaging and Fluorescence Imaging." Thesis, 2015. http://etd.iisc.ernet.in/2005/3860.

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This thesis provides several nanomaterial systems that can be used as contrast agents in magnetic resonance imaging (MRI) and for optical fluorescence imaging. Nanoparticle systems described in this thesis fall under three categories: (a) graphene oxide-nanoparticle composites for MRI contrast agent application, (b) core-shell nanoparticles for MRI contrast agent application and (c) nanoparticle systems for both MRI and optical fluorescence imaging. In the case of graphene oxide based nano-composites, the following observations were made: (i) in the case of graphene oxide-Fe3O4 nanoparticle co
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Chia-HaoChang and 張家豪. "Decoration and application of nanoparticles on graphene oxide." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03440981752120576051.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>100<br>This study concerns the synthesis and catalytic properties of graphene oxide/platinum and graphene/gold nanocomposites. For the synthesis of composites, graphene oxide was prepared by Hummer’s method at first and then platinum or gold nanoparticles were decorated onto its surface via the microwave-assisted synthesis method. For the hydrogen generation from the hydrolysis of sodium borohydride catalyzed by graphene oxide/platinum nanocomposite, it was found that the hydrogen generation rate increased with increasing the temperature. As the catalyst amount in
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50

Kai-ChihHsu and 許凱智. "Preparation and applications of nanoparticles-deposited reduced graphene oxide." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60109120605446246625.

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博士<br>國立成功大學<br>化學工程學系<br>103<br>Recently, graphene has emerged as a key material or support for the various applications owing to its excellent physical, chemical and electronic properties. As the derivatives of graphene, graphene oxide (GO) and reduced graphene oxide (rGO) are widely used as starting materials for the fabrication of composites due to their low-cost property, large scale production and easy functionalization owing to the many reactive oxygenated functional groups. This dissertation includes four parts: 1. Green synthesis and synergistic catalytic effect of Ag/reduced graphen
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