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Tesi sul tema "Graphite"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Qiu, Xiaoyu. "Procédé d'exfoliation du graphite en phase liquide dans des laboratoires sur puce." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI056/document.

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L’exfoliation en phase liquide du graphite est un procédé simple susceptible de produire du graphène à faible coût. Ces dernières années, de nombreuses équipes ont exploité la cavitation acoustique et la cavitation hydrodynamique comme moyen d’exfoliation. La cavitation acoustique ne peut traiter qu’une quantité limitée de fluide et génère des défauts sur la structure du graphène,tandis que la cavitation hydrodynamique dans une solution en écoulement n’agit que localement pendant une durée très brève. Les équipes de recherche utilisant ce dernier procédé compensent cette brièveté en imposant à

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2

Ballestar, Ana. "Superconductivity at Graphite Interfaces." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-141196.

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The existence of superconductivity in graphite has been under discussion since the 1960s when it was found in intercalated graphitic compounds, such as C8K, C8Rb and C8Cs. However, it was only about 40 years ago when the existence of superconductivity in pure graphite came up. In this work we directly investigate the interfaces highly oriented pyrolytic graphite (HOPG) has in its inner structure, since they play a major role in the electronic properties. The results obtained after studying the electrical transport provide clear evidence on granular superconductivity localized at the interfaces

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3

Yu, Wenlong. "Infrared magneto-spectroscopy of graphite and graphene nanoribbons." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54244.

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The graphitic systems have attracted intensive attention recently due to the discovery of graphene, a single layer of graphite. The low-energy band structure of graphene exhibits an unusual linear dispersion relation which hosts massless Dirac fermions and leads to intriguing electronic and optical properties. In particular, due to the high mobility and tunability, graphene and graphitic materials have been recognized as promising candidates for future nanoelectronics and optoelectronics. Electron-phonon coupling (EPC) plays a significant role in electronic and optoelectronic devices. Therefor

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4

Solane, Pierre-Yves. "Spectroscopie optique du graphite-graphène sous champs mégagauss." Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1874/.

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La découverte expérimentale du graphène (monocouche de graphite) en 2004 a provoqué un grand engouement dans la communauté scientifique. Cela a également renouvelé l'intérêt pour l'étude du graphite. Les propriétés de ces deux matériaux ont largement été étudiées par le biais de différentes techniques expérimentales (transport, optique. . . ). Dans cette thèse nous démontrons que les mesures de transmission effectuées sous champ magnétiques très intenses (> 1 millions de fois le champ magnétique terrestre) sont un outil très puissant pour étudier la structure électronique du graphène et du

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5

Geng, Yan. "Preparation and characterization of graphite nanoplatelet, graphene and graphene-polymer nanocomposites /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20GENG.

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6

Risley, Mason J. "Surfactant-assisted exfoliation and processing of graphite and graphene." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/48980.

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Surfactant assisted solution exfoliation of expanded graphite by means of sonication was carried out in an attempt to produce non-covalent charge functionality on the surface of graphene for the directed self assembly of graphene films on patterned substrates via electrostatic interactions. This thesis includes the results of experimental research associated with: 1) quantifying the effectiveness of various di-functionalized dithienothiophene surfactant small molecules, 2) further understanding the surface affinity and interaction mechanism between these surfactant molecules and the surface of

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7

Abro, Mehwish. "Modelling the exfoliation of graphite for production of graphene." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-272339.

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The aim of my thesis is to make a theoretical model of data obtained from liquid-phase exfoliation of graphene. The production of graphene in the liquid phase exfoliation is a cost efficient method One part of this work is devotedto learn the method of production of graphene by the shear mixing technique from the graphite and to estimate some important parameters which are crucial for the process. Other part of my work is based on studying the liquid-phase exfoliation mechanism of graphene through ultrasonication technique. This method is time consuming as compared to shearmixing.

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8

Alofi, Ayman Salman Shadid. "Theory of phonon thermal transport in graphene and graphite." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/15687.

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Abstract (sommario):

Thermal properties of graphene and graphite have been investigated by employing the analytical expressions for the phonon dispersion relations and the vibrational density of states derived by Nihira and Iwata, which are based on the semicontinuum model proposed by Komatsu and Nagamiya. The thermal conductivities of graphene and graphite are computed within the framework of Callaway’s effective relaxation time theory. The Normal-drift contribution (the correction term in Callaway’s theory) produces a significant addition to the result obtained from the single-mode relaxation time theory, clearl

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9

Shokri, Roozbeh [Verfasser], and Günter [Akademischer Betreuer] Reiter. "Self-Assembly of supra-molecular systems on graphene or graphite = Selbstorganisation von Supramolekularen Systemen auf Graphen oder Graphit." Freiburg : Universität, 2013. http://d-nb.info/1123475415/34.

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10

Csapo-Hounkponou, Elisabeth. "Etude du comportement tribologique de couples graphite/cuivre et graphite/graphite dans un contact électrique glissant." Vandoeuvre-les-Nancy, INPL, 1993. http://www.theses.fr/1993INPL152N.

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11

Solane, P. Y. "Spectroscopie Optique du Graphite et du Graphène sous Champ Mégagauss." Phd thesis, Université Paul Sabatier - Toulouse III, 2012. http://tel.archives-ouvertes.fr/tel-00777855.

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Abstract (sommario):

La découverte expérimentale du graphène (monocouche de graphite) en 2004 a provoqué un grand engouement dans la communauté scientifique. Cela a également renouvelé l'intérêt pour l'étude du graphite. Les propriétés de ces deux matériaux ont largement été étudiées par le biais de différentes techniques expérimentales (transport, optique...). Dans cette thèse nous démontrons que les mesures de transmission effectuées sous champ magnétiques très intenses (> 1 millions de fois le champ magnétique terrestre) sont un outil très puissant pour étudier la structure électronique du graphène et du graphi

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12

Sokolov, Denis A. "Investigation of Graphene Formation from Graphite Oxide and Silicon Carbide." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/53642.

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Graphene is a novel two dimensional material that is revolutionizing many areas of science and it is no surprise that a significant amount of effort is dedicated to its investigation. One of the major areas of graphene research is the development of procedures for large scale production. Among many recently developed methodologies, graphene oxide reduction stands out as a straightforward and scalable procedure for producing final material with properties similar to those of graphene. Laser reduction of graphite oxide is one of the novel approaches for producing multilayer graphene, and this wo

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13

Cuharuc, Anatolii S. "Electron transfer on graphene and graphite : theoretical and experimental study." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/78764/.

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The redox behaviour of several couples on highly oriented pyrolytic graphite (HOPG) and graphene has been studied using both micro- and macroscopic measurements supported by detailed analysis. The ET kinetics of Ru(NH3)6 3+/2+ , (ferrocenylmethyl)trimethylammonium (FcTMA2+/+ ), and ferrocenylcarboxylic acid (FcCOO-/0 ) was found fast, on the time-scale of voltammetric measurements, on a freshly cleaved HOPG surface, but on “aged” one, Ru(NH3)6 3+/2+ exhibited sluggish ET, showing quite unusual macroscopic cyclic voltammograms. The other two couples retained their fast response on an “aged” sur

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14

Arbuzov, A. A., V. E. Muradyan, and B. P. Tarasov. "Synthesis of Few-layer Graphene Sheets via Chemical and Thermal Reduction of Graphite Oxide." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35063.

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Few-layer graphene sheets were produced from graphite oxide (GO) chemical and thermal reduction. For the chemical reduction of GO as reducing agents were used hydrazine hydrate, hydroxylammonium chloride, sodium borohydride and sodium sulfite. The reduced material was characterized by elemental analysis, thermo-gravimetric analysis, scanning electron microscopy, X-ray diffraction, Fourier transform infrared and Raman spectroscopy. A comparison of the deoxygenation efficiency of graphene oxide suspension by different method or reductants has been made, revealing that the highest degree

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15

Salamanca-Riba, Lourdes G. "Structural studies of graphite intercalation compounds and ion implanted graphite." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/97287.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1985.<br>MICROFICHE COPY AVAILABLE IN ARCHIVES AND SCIENCE.<br>Includes bibliographical references.<br>by Lourdes G. Salamanca-Riba.<br>Ph.D.

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16

Herraiz, Michael. "Graphène et fluorographène par exfoliation de graphite fluoré : applications électrochimiques et propriétés de surface." Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAC094/document.

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Abstract (sommario):

Sa conductivité électronique ou encore sa transparence optique sont autant de propriétés physico-chimiques singulières du graphène qui expliquent le nombre accru de méthodes d’exfoliation de précurseurs graphitiques développées pour l’obtention de ce matériau. Pour palier à l’utilisation d’un oxyde de graphite/graphène caractérisé par une chimie de surface mal maitrisée, des graphites fluorés, de cristallinité mais aussi de concentration en fluor variables, ont été préparés par fluoration de graphite sous fluor moléculaire pur après optimisation des paramètres. Les précurseurs, que ce soit par

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17

Zhang, Guohui. "Electrochemistry and applications of sp2 carbon materials : from graphite to graphene." Thesis, University of Warwick, 2016. http://wrap.warwick.ac.uk/89303/.

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This thesis can be divided into three themes: (i) the electrochemistry of sp2 carbon materials, with a focus on graphite and graphene, where electron transfer (ET) kinetics and surface functionalisation were considered; (ii) methodology development for graphene transfer, to facilitate the fabrication of versatile tools for microscopy research and allow the properties of supported and suspended graphene to be readily assessed and compared; (iii) the electrowetting of graphite, providing a new mechanism for droplet actuation on a conducting surface with an applied electric field. There is a larg

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18

Xia, Jun. "Syntheses and studies of some graphite and graphite flouride intercalation compounds." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29823.

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The oxidative intercalation of S₂O₆F₂ into graphite ( SP-1 powder) in the gas phase has been studied. X-ray powder diffraction spectra shows that stage-1, stage-2 and stage-3 graphite fluorosulfates have been obtained. The compositions of these three compounds are C₇.₈SO₃F, C₁₅.₅SO₃F and C₂₄S0₃F according to gravimetry with the repeat space distances of 7.8lÅ, 11.08Å and 14.33Å respectively. X-ray photoelectron spectroscopy (XPS) has been extensively used to study some graphite acceptor intercalation compounds. Two effects have been observed, charge transfer leads to higher binding energy and

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19

Henni, Younes. "Etudes magnéto-Raman de systèmes - graphène multicouches et hétérostructures de graphène-nitrure de bore." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY060/document.

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Comme le quatrième élément le plus abondant dans l’univers, le carbone joue un rôle important dans l’émergence de la vie sur la terre comme nous la connaissons aujourd’hui. L’ère industrielle a vu cet élément au cœur des applications technologiques en raison des différentes façons dont les atomes forment les liaisons chimiques, ce qui donne lieu à une série d’allotropies chacun ayant des propriétés physiques extraordinaires. Par exemple, l’allotrope le plus thermodynamiquement stable du carbone, le cristal de graphite, est connu pour être un très bon conducteur électrique, tandis que le diaman

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20

Song, Zhimin. "Fabrication and Characterization of Nanopatterned Epitaxial Graphene Films for Carbon Based Electronics." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13943.

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In this thesis, we show that planar graphene ribbons have properties similar to those of nanotubes. Both exhibit semiconducting or metallic properties depending on crystal orientation. The band gap varies approximately as the inverse of the ribbon width. Both can be doped and gated. Due to these similarities, the patterned graphene also has nanotube like transport properties, which include coherent transport, ballistic transport, and high current capabilities. In essential contrast to nanotubes, graphene ribbons can be rationally patterned using standard electron beam lithography methods; func

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21

Smith, Richard Alan Paul. "Photoemission and tunnelling microscopy studies of graphite and argon ion irradiated graphite." Thesis, University of Liverpool, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269571.

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22

Rida, Hania. "Nouvelles données sur les systèmes graphite-lithium-europium et graphite-lithium-calcium." Thesis, Nancy 1, 2011. http://www.theses.fr/2011NAN10019/document.

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La méthode solide-liquide en milieu alliage fondu à base de lithium a permis ces dernières années la synthèse de plusieurs composés d'intercalation du graphite (CIG) insérés à coeur au sein des systèmes graphite-lithium-alcalino-terreux. Dans le cadre de cette thèse, cette méthode de synthèse a été étendue aux systèmes graphite-lithium-lanthanoïde, avec une difficulté supplémentaire qui est la méconnaissance des diagrammes de phases binaires lithium-lanthanoïde dont les données sont capitales pour déterminer les domaines de température et de composition chimique des alliages susceptibles de co

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23

Dandan, Satia Mohd Saidina. "Fabrication et caractérisation d’encres à base de graphène pour l’électronique souple." Thesis, Université de Lorraine, 2019. http://www.theses.fr/2019LORR0091/document.

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L'objectif principal de la présente étude est de développer des encres à base de graphène présentant d'excellentes propriétés de stabilité, électriques et physiques pour l'électronique d'impression en utilisant des techniques de revêtement par pulvérisation et d'impression par jet d'encre. Premièrement, la comparaison des différents types de matériaux similaires au graphène a montré que la mousse de graphène (GF) présentait la plus grande surface spécifique avec une valeur de 2136 m2g-1. Par ailleurs, les nanoplaquettes de graphite (GNPs) et le graphite synthétique (SG) présentaient des struct

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24

Gaskell, Peter. "Optical measurements of graphene and thin graphite films on low index substrates." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66999.

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The optical and electrical properties of the recently isolated two dimensional crystal graphene are explored in detail, both theoretically and experimentally. The physical theory for the behavior of electrons in graphene is introduced. Electromagnetic theory is applied to the understanding of optical measurements on graphene samples. Original work on the measurement of layers on bulk transparent substrates is presented. A design for a free space optical instrument intended to make optical measurements on graphene is shown in detail, and measurements made with the system are p

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25

Espeland, Erlend. "Gold Nanostructures on Graphite." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22433.

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Gold nanoparticles supported on a graphite substrate are prepared by thermal evaporation, and subsequently studied by X-ray photoelectron spectroscopy (XPS), temperature programmed desorption (TPD) of carbon monoxide and scanning electron microscopy (SEM).Increasing the amount of gold deposited leads to a shift of the desorption peak to higher temperatures, and the gold particles become larger.Depositing approximately the same amount of gold at different evaporation ratios does not seem to affect the desorption.Triangularly shaped gold particles appeared at higher evaporation rates.This is tho

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26

Theodosiou, Alex. "Simulation of irradiated graphite." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/55507/.

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27

Schneider, Johannes. "Propriétés électroniques du graphite." Grenoble, 2010. http://www.theses.fr/2010GRENY047.

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Dans cette thèse le magnétotransport à basse température (T = 10 mK) et l'effet de Haas-van Alphen sont examinés pour le graphite naturel et le graphite HOPG. Dans la première partie, le magnétotransport au champ magnétique jusqu'à B = 11 T est présenté. Une analyse de Fourier du signal après soustraction du fond de magnétorésistance montre que le transport électrique dans le graphite est dominé par deux types de porteurs avec des fréquences et phases en accord avec le modèle SWM. Nous confirmons la validité du modèle SWM par des calculs détaillés de la structure de bande en champ magnétique.

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28

Janot, Raphaël. "Mécanosynthèse en milieu liquide de composés graphite-lithium superdenses, de graphite très anisométrique et de maghémite supportée ou non sur graphite." Nancy 1, 2001. http://www.theses.fr/2001NAN10173.

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De nouveaux matériaux anodiques pour les batteries lithium-ion ont été préparés par mécanosynthèse. Dans le cas de la synthèse de composés graphite-lithium, un composé d'intercalation de stoechiométrie LiC3 est obtenu par broyage en milieu liquide. La mécanosynthèse est la première technique qui permet de préparer un composé aussi riche en lithium stable dans les conditions ambiantes. Le broyage de graphite seul en milieu liquide a également été étudié. En utilisant un broyeur planétaire, il est possible de préparer du graphite très anisométrique (facteur de forme voisin de 100) à partir d'un

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29

Engelbert, Carl Robert. "Statistical characterization of graphite fiber for prediction of composite structure reliability." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA238020.

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Thesis (M.S. in Aeronautical Engineering)--Naval Postgraduate School, June 1990.<br>Thesis Advisor(s): Wu, Edward M. "June 1990." Description based on signature page as viewed on October 21, 2009. DTIC Identifier(s): Graphite fiber strength testing, graphite fiber statistical evaluation. Author(s) subject terms: Graphite fiber strength testing, graphite fiber statistical evaluation, composite reliability predictions. Includes bibliographical references (p. 78-79). Also available in print.

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30

Precker, Christian E., Pablo D. Esquinazi, Ana Champi, et al. "Identification of a possible superconducting transition above room temperature in natural graphite crystals." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-216014.

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Measuring with high precision the electrical resistance of highly ordered natural graphite samples from a Brazil mine, we have identified a transition at ∼350 K with ∼40 K transition width. The steplike change in temperature of the resistance, its magnetic irreversibility and time dependence after a field change, consistent with trapped flux and flux creep, and the partial magnetic flux expulsion obtained by magnetization measurements, suggest the existence of granular superconductivity below 350 K. The zero-field virgin state can only be reached again after zero field cooling the sample from

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31

Letoffé, Adrien. "Élaboration et caractérisation d’une matrice polypropylène chimiquement modifiée et chargée GNP/graphène fonctionnalisés." Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0076.

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Au cours de la dernière décennie, la prise de conscience écologique a impacté les domaines de la recherche. Pour diminuer la production de gaz à effet de serre de nombreux changements sont à apporter aux modes de consommations. Dans le domaine des transports, plusieurs pistes de recherche sont possibles comme l’allégement des structures. L’une des pistes pour permettre cet allégement est l’élaboration de nouveaux matériaux composites métal/polymère. Le polymère de ce composite doit présenter une bonne adhésion aux surfaces métalliques, de bonnes propriétés mécaniques, et de conductivité thermo

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32

van, den Berg Jacobus Petrus. "Graphite: origin, deposits and economics: an exploration study of the Orom Graphite project." Thesis, Rhodes University, 2018. http://hdl.handle.net/10962/63786.

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Developing exploration projects successfully requires that the Reasonable Prospects for Eventual Economic Extraction (RPEEE) be confirmed and based on the global market perception and trend. The exploration methods applied in the attempt to establish this RPEEE must be based on a key management framework that assures the results, and eventually the conclusion, are obtained with best practical and technical approaches whilst managing the risks and capitalizing on each result. The Orom Graphite project is located within the East African Orogenic belt, a suture zone between the Congo craton and t

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33

Outti, Brahim. "Nouvelles études sur les systèmes ternaires graphite-alcalin-mercure et graphite-alcalin-thallium." Nancy 1, 1993. http://www.theses.fr/1993NAN10210.

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Les études réalisées sur l'insertion dans le graphite des alliages alcalin lourd-mercure et alcalin lourd-thallium, présentaient aujourd'hui un certain nombre de points obscurs et même des lacunes (structure des thallographitures). Une étude approfondie de l'action sur le graphite de ces alliages nous a permis de déterminer ou de confirmer les conditions thermodynamiques de formation des divers composes ternaires, ainsi que de mettre en évidence les mécanismes réactionnels. L'examen structural de ces composés a fourni un très grand nombre de renseignements concernant l'organisation cristalline

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34

Nyangiwe, Nangamso Nathaniel. "Graphene based nano-coatings: synthesis and physical-chemical investigations." Thesis, UWC, 2012. http://hdl.handle.net/11394/3237.

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Magister Scientiae - MSc<br>It is well known that a lead pencil is made of graphite, a naturally form of carbon, this is important but not very exciting. The exciting part is that graphite contains stacked layers of graphene and each and every layer is one atom thick. Scientists believed that these graphene layers could not be isolated from graphite because they were thought to be thermodynamically unstable on their own and taking them out from the parent graphite crystal will lead them to collapse and not forming a layer. The question arose, how thin one could make graphite. Two scienti

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35

Konschuh, Sergej [Verfasser], and Jaroslav [Akademischer Betreuer] Fabian. "Spin-orbit coupling effects: from graphene to graphite / Sergej Konschuh. Betreuer: Jaroslav Fabian." Regensburg : Universitätsbibliothek Regensburg, 2011. http://d-nb.info/1023276178/34.

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36

Sole, C. G. "Application of few layer graphene and exfoliated graphite materials in lithium ion batteries." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3019844/.

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37

Torche, Abderrezak. "Simulations ab-initio des spectres Raman résonants dans le graphène, les multicouches de graphène et le graphite." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066522/document.

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Les multicouches de graphène en empilement rhomboédrique sont considérés comme une phase prometteuse du carbone. Cela est due à la particularité de cette phase de pouvoir exhiber des états à forte corrélation électronique comme le magnétisme ou la supraconductivité à haute température critique. Ce qui est due, a son tour, à l’occurrence d’un état de surface avec une dispersion d’énergie électroniques quasi-nulle à proximité du niveau de Fermi. Malgré que le graphite Bernal soit la forme la plus stable du graphite, des échantillons a trois et quatre couches de graphène en empilement rhomboédriq

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38

Torche, Abderrezak. "Simulations ab-initio des spectres Raman résonants dans le graphène, les multicouches de graphène et le graphite." Electronic Thesis or Diss., Paris 6, 2017. http://www.theses.fr/2017PA066522.

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Les multicouches de graphène en empilement rhomboédrique sont considérés comme une phase prometteuse du carbone. Cela est due à la particularité de cette phase de pouvoir exhiber des états à forte corrélation électronique comme le magnétisme ou la supraconductivité à haute température critique. Ce qui est due, a son tour, à l’occurrence d’un état de surface avec une dispersion d’énergie électroniques quasi-nulle à proximité du niveau de Fermi. Malgré que le graphite Bernal soit la forme la plus stable du graphite, des échantillons a trois et quatre couches de graphène en empilement rhomboédriq

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Law, A. R. "A photoemission study of graphite." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355882.

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40

Hodgkins, Andrew D. "Crack propagation in nuclear graphite." Thesis, University of Manchester, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488486.

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41

Repasi, Ivett. "Expanded graphite filled polymer composites." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557649.

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The aim of this project was to produce expanded graphite (EO) and modified EO-filled electrically conductive polymer composites and to investigate the effects of different additive modifications and preparation conditions on the microstructure and electrical properties of these composites. Modifications included the use of dry blending and ultrasound to reduce their size, use of various suspension media and surfactants to stabilize particle suspensions. To compare the effectiveness of different filler modification processes on electrical conductivity, unmodified and treated EO were incorporate

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Patterson, Adele. "Retention properties of porous graphite." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342124.

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Andriotis, Andreas. "Fracture instability in nuclear graphite." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/8f4c72b9-6a8a-4c69-8ded-5425f847a148.

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This dissertation considers the fracture instability of nuclear graphite, specifically of isotropic Gilsocarbon, grade IM1-24, which acts as a structural component and neutron moderator within reactors. The presence of cracks within this graphite informs its behaviour and necessitates a study of fracture properties and instability. Amongst the factors studied, a major finding was that the size effect was the most prevalent. Two aspects of instability were also examined: the crack driving force or energy release rate and the fracture resistance or the incremental work of fracture. The condition

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Crump, Timothy. "Modelling dynamic cracking of graphite." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/modelling-dynamic-cracking-of-graphite(71e81d6f-e712-458c-aa48-0a256749258a).html.

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Advances in dynamic fracture modelling have become more frequent due to increases in computer speed, meaning that its application to industrial problems has become viable. From this, the author has reviewed current literature in terms of graphite material properties, structural dynamics, fracture mechanics and modelling methodologies to be able to address operational issues related to the ageing of Advanced Gas-cooled Reactor (AGR) cores. In particular, the experimentally observed Prompt Secondary Cracking (PSC) of graphite moderator bricks which has yet to be observed within operational react

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Ashaboglu, Ahmet F. (Ahmet Fadil). "Cryotribology of graphite and diamond." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38115.

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Lasithiotakis, Michail Georgioy. "Irradiated graphite waste - stored energy." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/irradiated-graphite-waste--stored-energy(c93c7581-5273-4d30-a05b-2153b4c7cfaf).html.

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The cores of early UK graphite moderated research and production nuclear fission reactors operated at temperatures below 150°C. Due to this low temperature their core graphite contains significant amounts of stored (Wigner) energy that may be released by heating the graphite above the irradiation temperature. This exothermic behavior has lead to a number of decommissioning issues which are related to long term "safe-storage", reactor core dismantling, graphite waste packaging and the final disposal of this irradiated graphite waste. The release of stored energy can be modeled using kinetic mod

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Hartley, Mark. "The friability of nuclear graphite." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362196.

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Lacaze, Emmanuelle. "Etude par microscopie a effet tunnel de polymeres conjugues : adsorbats sur graphite, films electropolymerises sur or et sur graphite, defauts de surface du graphite." Paris 7, 1991. http://www.theses.fr/1991PA077051.

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Durant les dix dernieres annees, les polymeres conjugues ont ete intensivement etudies notamment a cause des possibilites de dopage qui leur permettent de devenir conducteurs. La stm (scanning tunneling microscopy ou microscopie a effet tunnel) semble une technique parfaitement adaptee a leur etude. Mais c'est une technique tres jeune, en particulier sur les materiaux organiques. C'est pourquoi une partie de cette these concerne la comprehension des informations apportees par des images stm de macromolecules. Une autre partie de la these est l'etude de macromolecules de polythiophene adsorbees

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N'Guessan, Gilbert Kouakou. "Réduction électrochimique du composé d'insertion graphite-chlorure de cobalt : étude du composé réduit graphite-cobalt." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0082.

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Le compose d'insertion du graphite c#5cocl#2#,#1#0 est utilise en cathode d'une pile au lithium. La decharge d'une telle pile conduit a la reduction en deux etapes du chlorure de cobalt insere. Le compose ainsi reduit de formule chimique moyenne c#1#1co#0#,#6##0#,#8(co cl#2)#0#,#4##0#,#2(licl)#0#,#5 contient une phase dans laquelle le cobalt est insere en 1#e#r stade

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Leve, Zandile Dennis. "Determination of paracetamol at the electrochemically reduced graphene oxide-metal nanocomposite modified pencil graphite (ERGO-MC-PGE) electrode using adsorptive stripping differential pulse voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7350.

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>Magister Scientiae - MSc<br>This project focuses on the development of simple, highly sensitive, accurate, and low cost electrochemical sensors based on the modification of pencil graphite electrodes by the electrochemical reduction of graphene oxide-metal salts as nanocomposites (ERGO-MC-PGE; MC = Sb or Au nanocomposite). The electrochemical sensors ERGO-Sb-PGE and ERGO-Au-PGE were used in the determination of paracetamol (PC) in pharmaceutical formulations using adsorptive stripping differential pulse voltammetry. The GO was prepared from graphite via a modified Hummers’ method and characte

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