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Dissertations / Theses on the topic 'NbC carbide'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Labonne, Mathilde. "Frittage et évolution microstructurale de carbures cémentés NbC-Ni." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI056.

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Depuis plus de 70 ans, les carbures cémentés WC-Co sont utilisés mondialement dans de nombreuses applications telles que l'outillage, les équipements miniers, ou encore les pièces d'usure. Cependant, il a récemment été déterminé que les oxydes de cobalt et de tungstène peuvent présenter des risques pour la santé. De plus, la demande mondiale de tungstène et de cobalt n’a cessé d’augmenter au fil des ans, entrainant de régulières hausses des prix. Ce contexte défavorable encourage les entreprises à développer des matériaux à base de carbures alternatifs. Les carbures de niobium sont notamment d

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2

Guiz, Robin. "Influence d’additions de titane/tungstène et de vanadium sur la précipitation de carbures secondaires au sein d’alliages modèles de type HP." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM011/document.

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Les alliages de type HP constituent un matériau de choix pour l'élaboration des tubes de vaporeformage et de vapocraquage dans l'industrie pétrochimique. Exposés à des températures comprises entre 700°C et 1000°C sous des pressions gazeuses de plusieurs MPa, leur microstructure initiale associée à une fine précipitation secondaire, intervenant en cours de service, leur confèrent une excellente résistance aux mécanismes de fluage auxquels ils sont sujets. Néanmoins, à terme, la coalescence des précipités conduit à la dégradation rapide des tubes.Les effets de certains éléments d'alliages (V, Ti

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3

Ferreira, Vanderlei. ""Processamento, Caracterização Mecânica e Tribológica do Compósito Al2O3-NbC."." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-17122001-143416/.

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Neste trabalho foi investigado o processamento e propriedades mecânicas e tribológicas do compósito cerâmico Al2O3- NbC com o objetivo de desenvolver um compósito cerâmico com melhores propriedades do que a alumina pura. Como material para comparação foi utlizado a alumina que é uma cerâmica tradicionalmente aplicada onde é necessária elevada resistência mecânica e ao desgaste. A composição Al2O3-0,5%wtY2O3-20%wtNbC, que origina o compósito, passou por moagem e mistura em moinho tipo atrittor e secagem em evaporador rotativo. O pó obtido foi caracterizado quanto a distribuição granulométrica e

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4

Maminska, Karolina. "Optimisation microstructurale d’un acier HP pour des applications à haute température." Thesis, Saint-Etienne, EMSE, 2013. http://www.theses.fr/2013EMSE0696/document.

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L’objectif de ce travail est d’améliorer la durée de vie en fluage d’un alliage résistant à haute température. L’alliage étudié, nommé « C », appartient à la classe des aciers austénitiques de type HP utilisés pour la fabrication des tubes de reformage. L’évolution microstructurale de l’alliage « C » a été étudiée dans une vaste gamme de températures, s’étendant de 700 à 1040°C pour des temps de vieillissement allant jusqu’à 1000 h. La caractérisation de ces états vieillis a été réalisée au moyen de la microscopie électronique (MEB-FEG, MET) et de la diffraction des rayons X. L’accent a été mi

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5

Furukava, Marciano. "Sinteriza??o de a?o inoxid?vel refor?ado com part?culas nanom?tricas dispersas de carbeto de ni?bio - NbC." Universidade Federal do Rio Grande do Norte, 2007. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12700.

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6

Silva, J?nior Jos? Ferreira da. "Comportamento da adi??o do carbeto de ni?bio (nBC) na matriz met?lica do a?o ferr?tico 15kH2mfa." Universidade Federal do Rio Grande do Norte, 2012. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12804.

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7

SANTOS, THAIS da S. "Micro-nanocompósitos de Al2O3/ NbC/ WC e Al2O3/ NbC/ TaC." reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23599.

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8

Gao, Wei. "Oxidation of nitride-bonded silicon carbide (NBSC) and hot rod silicon carbide with coatings." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366751.

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9

TONELLO, KAROLINA P. dos S. "Compositos a base de Alsub(2)Osub(3) com adicoes de NbC e de MgO." reponame:Repositório Institucional do IPEN, 2009. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11780.

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TONELLO, KAROLINA P. dos S. "Compósitos de alumina com adições de NbC, TaC e TiC para aplicação em ferramentas de corte." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10206.

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11

Bémont, Emilie. "La germination du carbure de niobium NbC dans la ferrite vue par tomographie atomique." Rouen, 2003. http://www.theses.fr/2003ROUES040.

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La germination des carbures de niobium NbC dans une matrice ferritique est un phénomène généralement décrit par la théorie de la germination et croissance. Cependant, l'écart paramétrique considérable entre les structures cristallographiques de la phase NbC et de la ferrite implique que la germination homogène de la phase d'équilibre est impossible. L'objectif de ce travail est de déterminer le processus de formation des précipités NbC aux tout premiers stades. Etant donnée la très petite taille des objets à caractériser, cette étude nécessite l'emploi d'une technique d'analyse à l'échelle ato

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12

FERREIRA, VANDERLEI. "Processamento, caracterizacao mecanica e tribologica do composito Alsub(2)Osub(3)-Nbc." reponame:Repositório Institucional do IPEN, 2001. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10894.

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PANELLI, RENATO. "Processamento do aco AISI M2 com adicao de 10 porcento vol. NbC utilizando a tecnica de mechanical alloying." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10748.

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14

Borchardt, Lars. "Carbide and Carbide-Derived Carbon Materials with Hierarchical Pore Architecture." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-107865.

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This thesis addressed the development of new porous carbides and carbide-derived carbons; in particular materials based on silicon-, boron-, tungsten-, and titanium carbide. Therefore, different hard- and soft-templating approaches were applied and the materials were additionally functionalized with catalytic active components and shaped into nm- and mm-sized spherical particles.

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15

Ellul, Charles. "Trimetallic N-heterocyclic carbene complexes." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538279.

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Saker, Oliver John. "Mono- and tri-nuclear ruthenium complexes incorporating N-heterocyclic carbene ligands." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512305.

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17

COUTINHO, ANA C. de S. "Influência da adição de carbetos (NbC,TaC, SiC e TiC) na sinterização de cerâmicas à base de Sisub(3)Nsub(4)." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11351.

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PASOTTI, ROSA M. da R. "Obtencao e caracterizacao do composito Alsub2 Osub3-NbC e o efeito da adicao de Ysub2 Osub3 na sua sinterizacao." reponame:Repositório Institucional do IPEN, 1999. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10745.

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Tonello, Karolina Pereira dos Santos. "Compósitos de alumina com adições de NbC, TaC e TiC para aplicação em ferramentas de corte." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-29052013-092205/.

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No presente trabalho foram desenvolvidos compósitos à base de alumina, com adição de carbetos de metais de transição, NbC, TaC e TiC, como reforço. Os carbetos, na forma de partículas, foram adicionados em 1,5% em volume à matriz de alumina durante a moagem em attritor. O processamento foi realizado por moagem em attritor, secagem em rotoevaporadora e desaglomeração em peneira. A dinâmica de oxidação dos carbetos e das composições dos compósitos foi estudada para a definição de parâmetros de sinterização e processamento dos compósitos. A cinética de sinterização foi estudada por dilatometria,

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20

McMullon, Max William. "Exploiting anionically-tethered N-heterocyclic carbene complexes for small molecule activation." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31079.

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N-heterocyclic carbenes (NHCs) can be used as ligands for organometallics complexes, which can then facilitate numerous catalytic applications, such as, C-H activation, small molecule activation and numerous materials applications. The use of anionically-tethered NHCs for usage with electropositive metals has been pioneered by the Arnold group within the last decade. This thesis describes the synthesis of both aryloxide- and amide-tethered NHC organometallic complexes of s-, p-, d- and f-block metals to provide a platform for small molecule activation. Once synthesised, the reactivity of some

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21

Durmus, Semih. "Silver(I) and Gold(I) N-Heterocyclic Carbene Complexes." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1165247084.

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22

Marr, Isobel Helen. "Synthesis and reactivity of scandium N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/17970.

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Chapter one introduces N-heterocyclic carbenes (NHCs) and discusses their use as ligands for rare earth metal complexes, with particular emphasis upon compounds synthesised from 2009 until the present day. Chapter two details the synthesis and characterisation of the homoleptic scandium-NHC complex [Sc(L)3] (L = [OCMe2CH2(1-C{NCHCHNiPr})]). Reactions of [Sc(L)3] with boranes, CO2 and CS2 are described which exploit the relative lability of the Sc–Ccarbene bond and allow formation of [Sc(L)2(OCMe2CH2(1-B'C{NCHCHNiPr}))] (B' = 9-BBN, BPh3, B(C6F5)3, BH3), [Sc(OCMe2CH2(1-O2CC{NCHCHNiPr})3]n, [Sc(

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23

Robinson, William J. III. "Development of Tetrathiafulvalene Fused N-Heterocyclic Carbene Compounds." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1610382201476554.

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24

Geraghty, Paul Bythell. "Studies towards the synthesis of fused N-Heterocyclic carbene precursors." Thesis, University of Canterbury. Chemistry, 2013. http://hdl.handle.net/10092/8197.

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This thesis describes the preparation of a various NHC ligands with five and six-membered rings, different fused aromatic cores and the subsequent synthetic development of their complexation of with Ag, Ru and Pd. The investigation and preparation of these compunds was with the intention of exploring their chemical and physical properties. The synthesis of the NHC ligands proved to be difficult, but analysis and characterisation of the side products from the reactions helped to establish successful synthetic methodologies. In both the five and six-membered research conducted a common attribute

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RUMBAO, ALEXANDRE H. "Influência da ítria nas propriedades mecânicas e térmicas do compósito Al sub(2) O sub(3) - 20 porcento NbC." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11032.

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26

Janz, Stefan. "Amorphous Silicon Carbide for Photovoltaic Applications." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-32019.

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Medici, Fabrizio. "Interactions entre les Spirosilane de Martin et Base de Lewis coordination, frustration et nouveau ligand anionique." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLET029.

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Ce travail de thèse est consacré à l’étude de la réactivité du spirosilane de Martin, une molécule présentant des propriétés intéressantes notamment en présence de bases de Lewis, qui a trouvé des applications diverses comme la détection d’ions fluorures. En ce qui nous concerne, nous avons choisi d’étudier l’interaction de ce dérivé du silicium avec des bases de Lewis neutres fortes tels que les Carbènes N-Hétérocycliques (NHC) qui ont été beaucoup utilisés pour stabiliser les espèces de basse valence des éléments du bloc p. Alors que les NHC sont connus pour former avec les chlorosilanes des

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Baffert, Mathieu. "Synthesis of ruthenium complexes having one or more N-heterocyclic carbene ligands supported on hybrid mesostructured silicas and their use in the hydrogenation of carbon dioxide." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00838661.

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The goal of this PhD was to elaborate supported Ru-NHC catalytic materials based on hybrid organic-inorganic materials having imidazolium units perfectly distributed within a silica matrix. Passivation of these imidazolium materials followed by formation of NHC-carbene and reaction with [RuCl2(p-cymene)]2 provided these well-defined surface sites of general structures RuCl2(NHC)(L), where L was para-cymene (p-cymene) or THF depending on the reaction conditions, which could be further replaced by PMe3. These systems were then tested in the hydrogenation of CO2 in presence of amine to give forma

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Boschetti, Riccardo. "Synthesis of novel N-heterocyclic carbene precursors for new chiral complexes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16665/.

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Lo scopo del seguente lavoro di tesi è la sintesi e lo studio di nuovi leganti chirali N-eterociclici ad anello espanso derivanti dal diacido canforico. Lo sviluppo di nuovi leganti chirali nasce dalla possibilità di utilizzo in catalisi enantioselettiva. Questa tipologia di leganti sono facilmente sintetizzati dal diacido canforico utilizzando diverse vie di sintesi. La via di sintesi utilizzata permette di ottenere facilmente una funzionalizzazione asimmetrica. Il legante è stato studiato nella sintesi di un nuovo complesso chirale di Pd(II) utilizzando diverse condizioni di reazione. Inoltr

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Kascatan, Nebioglu Aysegul. "N-HETEROCYCLIC CARBENE SILVER(I) COMPLEXES FROM XANTHINES AND THEIR ANTIMICROBIAL APPLICATIONS." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1176579309.

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Kelly, Roy A. III. "New Metal-NHC Complexes: Synthesis, Characterization, and Uses." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1817.

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N-Heterocyclic Carbenes (NHC) present a viable alternative to traditional phosphine ligands in a variety of organometallic mediated catalytic reactions. Singlet ground-state carbenes are stabilized by the push-pull presence of two adjacent nitrogen atoms in an imidizolium 5-membered ring, allowing neutral electron donor properties. The ability to synthesize a variety of NHC ligands with differing steric and electronic properties is possible by changing the sustiuents on the nitrogen atoms of the imidizolium. Tunable characteristics and enhanced chemical and thermal stability give NHC’s an adva

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Garmendia, Sofiem. "Synthesis of new N-Heterocyclic Carbene (NHC)-based Single Chain Nanoparticles (SCNPs) as catalytically active nanoreactors." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0009.

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Des poly(liquides ioniques) (PILs) arrangés sous la forme de copolymères aléatoires ont été développés avec des architectures telle que ce des nanoparticules à chaine unique ou bien sous la forme de (macro)gels. Ces différentes systèmes ont été employés comme précurseurs de carbènes N-heterocycliques (NHC)s à des fins de catalyses organiques. L’introduction d’anions relativement basiques dans des unités PIL dérives d’imidazolium permet la génération in situ des NHCs actifs pour la catalyse. D’abord, le développement de (macro)gel base sur des unités PIL réactives représente l’étude préliminair

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Resch, Stefan Günter. "Dinuclear Copper and Nickel Complexes of New Multidentate N-heterocyclic Carbene Ligands: Structures, Dynamics and Reactivity." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://hdl.handle.net/21.11130/00-1735-0000-0005-12D5-6.

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Fyfe, Andrew Alston. "d- and f-metal alkoxy-tethered N-heterocyclic carbene complexes." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/15862.

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Chapter one is an introduction, outlining the structure and bonding of N-heterocyclic carbenes (NHCs). It then goes on to give examples of f -metal NHC complexes and describes any reactivity or catalytic activity. Chapter two describes the synthesis of the transition metal NHC complexes [Fe (LMes)2] 3 and [Co(LMes)2] 4 (LMes = OCMe2 CH2(1-C{NCH2CH2NMes})). The heterobimetallic complexes [(LMes)Fe(μ-LMes)U(μ-{N(SiMe3)Si(Me)2CH2})(N(Si Me3)2)2] 5 and [(LMes)Co(μ-LMes)U(μ-{N(SiMe3)Si(Me)2CH2})(N(SiMe3)2)2] 6 were prepared from the reaction between [({Me3Si}2N)2U(NSiMe3SiMe2CH2)] and 3 or 4, respe

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Sahimi, Muhammad, and Theodore T. Tsotsis. "Preparation, characterization, and modeling of nanoporous silicon carbide membranes." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-184619.

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36

Damerval, Claire. "Contributions à l'étude du comportement mécanique des composites cotac γ /γ'-NbC à moyenne et haute température". Paris 11, 1986. http://www.theses.fr/1986PA112034.

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Cette thèse présente une étude du comportement des composites à fibres Cotac δ / δ’-NbC sous divers types de sollicitations mécaniques : fluage, traction transversale, cyclage thermique sous charge et fatigue oligo-cyclique. En fluage, nous avons montré que le transfert de charge de la matrice dans les fibres s'accompagne, dans le Cotac 784, d'un changement de mécanisme de déformation plastique de la matrice au cours d'un essai. D'autre part, nous avons étudié l'influence du mode de rupture des fibres sur l'allure des courbes de fluage, et mis en évidence l'influence de la résistance mécanique

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Fernandes, Maria Roseane de Pontes. "Comp?sitos de matriz met?lica ? base n?quel com adi??o de TaC e NbC produzidos via metalurgia do p?" Universidade Federal do Rio Grande do Norte, 2014. http://repositorio.ufrn.br:8080/jspui/handle/123456789/12857.

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Made available in DSpace on 2014-12-17T14:07:20Z (GMT). No. of bitstreams: 1 MariaRPF_TESE.pdf: 4797522 bytes, checksum: 8d9626466b01e2425f6ea6036398adcf (MD5) Previous issue date: 2014-01-24<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Carbide reinforced metallic alloys potentially improve some important mechanical properties required for the overall use of important engineering materials such as steel and nickel. Nevertheless, improved performance is achieved not only by composition enhancement but also by adequate processing techniques, such as novel sintering methods

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Gómez, Suárez Adrián. "Synthesis and reactivity studies of mono- and diaurated species bearing N-heterocyclic carbene ligands." Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/6546.

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The use of Au-NHC complexes in homogenous gold catalysis has become very popular during the last 10 years. The work described in this thesis represents a modest contribution towards a better understanding of the reactivity of these fascinating complexes and the intermediate species involved during gold-catalysed transformations. There are two main themes that permeate the following chapters: a) synthesis and reactivity studies of monoaurated species and b) synthesis and reactivity studies of diaurated species. The main motivation for the work presented herein was to develop more efficient synt

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Tomar, Pooja. "N-heterocyclic carbene derivatives for the activation of sulfur fluorides." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22932.

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Die metallfreie Aktivierung des Treibhasgases SF6 unter Verwendung von elektronenreichen N-heterocyclischen Carbenen (NHCs) resultierte in der Bildung des jeweiligen 2,2- Difluorimidazolins und Imidazolin-2-thions bzw. 2,2-Difluorimidazolidins und Imidazolidin-2-thions. Die Reduktion der NHCs mit SF4 liefert dieselben Produkte. Im Abbau von SF5CF3 mit NHCs werden ebenfalls die zuvor genannten Produkte erhalten, wobei zusätzlich das entsprechende 2-Fluor-2-trifluormethylderivat gebildet wird. Exemplarisch wurde 1,3-Dimesityl-2,2-difluorimidazolidin [SIMes(F)2] als Fluorierungsreagenz von Aldeh

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Pearson, Stephen. "High oxidation state carbene complexes for C-H bond activation catalysis." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/7570.

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Chapter one is an introduction to the less common coordination and oxidation chemistry of palladium; complexes containing Pd-OR, Pd-NR2 and those in the oxidation states of +IV. An outline of PdII/IV catalysed ligand-directed oxidative functionalisation is also included. Chapter two covers the design and synthesis of a range of tethered N-heterocyclic carbene (NHC) complexes of Pd. In addition, the syntheses of a number of new tethered NHC ligands are described. The use of Density Functional Theory (DFT) to model the complexes in this thesis was explored. Chapter three describes the synthesis

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Wright, Brian D. "Synthesis, Characterization, and Biological Activity of Silver Carbene Complexes and Their Precursors." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1353423024.

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Messori, Alessandro. "Bidentate N-heterocyclic carbene complex of Manganese as catalyst for hydrosilylation and hydroboration of double and triple bonds." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21666/.

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Scopo del presente lavoro di tesi è la sintesi di un complesso di manganese contenente un legante bis N-eterociclico e la sua applicazione come catalizzatore nelle reazioni di idrosililazione e idroborazione di doppi e tripli legami. I composti organici sililati e borilati sono importanti prodotti intermedi in diversi settori della chimica fine grazie alla loro stabilità e alla loro capacità di essere ampiamente funzionalizzati. Idroborazione e idrosililazione, grazie allo sviluppo di catalizzatori appositi, permettono di ottenere questi composti riducendo coprodotti, sottoprodotti e condizion

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Vincent, Cécile. "Le composite cuivre / nanofibres de carbone." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2008. http://tel.archives-ouvertes.fr/tel-00377607.

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Le matériau composite Cu/NFC (Nano Fibre de Carbone) peut être utilisé en tant que drain thermique par les industriels de l'électronique de puissance. En remplacement du cuivre, il doit combiner une conductivité thermique élevée et un coefficient de dilatation thermique adapté à celui de la céramique du circuit imprimé (alumine ou nitrure d'aluminium). Après avoir étudié les propriétés de la matrice cuivre et des NFC, plusieurs méthodes de synthèse du composite Cu/NFC ont été développées. Le composite a tout d'abord été élaboré par métallurgie des poudres. Puis, dans le but d'améliorer l'homog

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Passays, Johan. "Nouveaux ligands mixtes de type phosphore / carbène N-hétérocyclique : synthèse et applications en catalyse asymétrique." Thesis, Rouen, INSA, 2011. http://www.theses.fr/2011ISAM0008.

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Une méthode simple et efficace a été développée pour la préparation de ligands bifonctionnels associant les motifs phosphine ou phosphite d'une part, et carbène Nhétérocyclique(NHC) ou imidazolium d'autre part. Dans un premier temps, une série de ligands diphénylphosphine-carbène chiraux portant un centre stéréogène en a de la phosphinea été développée à partir b-hydroxyesters. Une famille de ligands a ainsi été développée afin d'évaluer l'influence de l'encombrement stérique de différents groupements alkyles en a de la phosphine et de la nature des groupements aromatiques portés sur l'imidazo

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Malek, Kotiba. "Redox-Active Silver N-Heterocyclic Carbene Complexes: A Dual Targeting Antibacterial Drug." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1535290903921698.

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Nickel, Winfried, Martin Oschatz, der Lehr Martin von, et al. "Direct synthesis of carbide-derived carbon monoliths with hierarchical pore design by hard-templating." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-151398.

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Carbide-derived carbon Monoliths (CDC-Ms) containing a multimodal arrangement with high volumes of micro- meso- and macropores are prepared by direct nanocasting of silica monoliths with polycarbosilane precursors. CDC-Ms show well-defined pore structures along with specific surface areas of more than 2600 m2 g−1 and overall pore volumes as high as 3.14 cm3 g−1. They exhibit advanced gas filtration properties compared to purely microporous materials due to enhanced storage capacities and kinetics as demonstrated by thermal response measurements based on InfraSORP technology.

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Simler, Thomas. "New transition metal complexes with functional N-heterocyclic carbene ligands for molecular activation." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF005.

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Le sujet de cette thèse porte sur l’étude de ligands hybrides incorporant un donneur carbène N-hétérocyclique (NHC). Les ligands phosphine-NHC construits sur le motif m-phénylène ont conduit à des complexes di- ou tétranucléaires d’Ag, Cu, Au et Ir, et à des complexes bimétalliques Ag/Cu et Ag/Ir par transmétallation sélective du site NHC. Dans le cas des ligands phosphino-picoline-NHC (PNC), la transmétallation des sels de Li ou K correspondants a permis d’isoler des complexes « pinceurs » dé-aromatisés du Cr, Fe et Co. La déprotonation du ligand bis(phosphinométhyl)pyridine (PNP) a été exami

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Berro, Patrick. "Exploring Photocatalytic and Electrocatalytic Reduction of CO2 with Re(I) and Zn(II) Complexes and Attempts to Employ a Novel Carbene Ligand to this Endeavor." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/41625.

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With the blend of addressing issues of sustainable energy with the environmental worries regarding emission of greenhouse gases, there is a motivation to target the efficient chemical reduction of CO2. Re(I) integrated photosensitizers and catalysts, synthesized from commercially available ligands, are introduced with the selective CO2 reduction of formic acid, making for a unique class of Re(I) catalysts typically selective for CO as a reduction product. Furthermore, synthesized Zn(II) phosphino aminopyridine complexes are structurally and computationally characterized as well as observed to

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Filsecker, Felipe. "Characterization and evaluation of a 6.5-kV silicon carbide bipolar diode module." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-217848.

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This work presents a 6.5-kV 1-kA SiC bipolar diode module for megawatt-range medium voltage converters. The study comprises a review of SiC devices and bipolar diodes, a description of the die and module technology, device characterization and modelling and benchmark of the device at converter level. The effects of current change rate, temperature variation, and different insulated-gate bipolar transistor (IGBT) modules for the switching cell, as well as parasitic oscillations are discussed. A comparison of the results with a commercial Si diode (6.5 kV and 1.2 kA) is included. The benchmark c

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Reichmann, Sven Ole. "Unconventional Carbene-Donor Ligands for the Development of new Catalysts." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://hdl.handle.net/11858/00-1735-0000-002B-7C59-C.

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