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Dissertations / Theses on the topic 'Carbon xerogel'

Author: Grafiati
Published: 6 September 2023
Last updated: 25 July 2025

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1

Jivanescu, Iulia Elena. "Structure and performance of carbon xerogel molded emitters for micropropulsion applications." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105616.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 91-94).<br>Ion electrospray propulsion relies on the transport of propellant to emission sites where ions and/or droplets are extracted to create thrust. The focus of this research is the creation of porous emitter substrates through which the liquid is passively transported. Previous substrates were created subtractively by selectively removing material to reveal emitter tips or arrays. The limitations of
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2

Niu, Pengfei. "Carbon Xerogel nanocomposite materials for electrochemical devices: application to heavy metal detection." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/309289.

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En aquesta Tesi es descriu la fabricació d’elèctrodes nanocompòsits de carboni porós en forma de capa prima i capa gruixuda i la seva aplicació en l’anàlisi de metalls pesants en aigües. Aquests nanocompòsits de carboni es van preparar a partir de la piròlisi de materials obtinguts per química sol-gel, concretament de gels de resorcinol-formaldehid i de resorcinol-formaldehid amb sílice, que contenien precursors de bismut. Els gels pirolitzats presenten una estructura de carbó porós amb porositat oberta que conté nanopartícules de bismut ben distribuïdes. Aquests materials es van moldre fins
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3

Weber, Christian [Verfasser], Jens [Gutachter] Pflaum, and Jean [Gutachter] Geurts. "Electrochemical Energy Storage: Carbon Xerogel-Manganese Oxide Composites as Supercapacitor Electrode Materials / Christian Weber. Gutachter: Jens Pflaum ; Jean Geurts." Würzburg : Universität Würzburg, 2016. http://d-nb.info/1111785198/34.

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4

Santos, Ana Rita Martins dos. "Eletroinserção de íons lítio em matrizes auto-organizadas de V2O5, poli(etilenoimina) e nanopartículas de carbono." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-18092013-090848/.

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Materiais auto-organizados constituídos de V2O5 xerogel, poli(etilenoimina) (PEI) e nanopartículas de carbono (NpCs) foram obtidos por meio da técnica camada-por-camada (LbL). A metodologia aplicada permitiu a obtenção de filmes finos com elevado controle de espessura além de permitir um crescimento linear dos filmes, denominados neste trabalho V2O5/PEI e V2O5/PEI/NpCs. Além disso, o desempenho eletroquímico dos materiais auto-organizados foi comparado a um eletrodo de V2O5. Análises de FTIR mostraram que interações específicas entre os grupos amina do PEI e os grupos carboxila do V2O5 são res
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5

Oyedoh, Eghe Amenze. "Synthesis of controlled porosity resorcinol formaldehyde organic and carbon xerogels for adsorption applications." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602790.

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The synthesis of resorcinol formaldehyde xerogels was investigated by controlling its porosity for potential use as a precursor for activated carbon adsorbents for heavy metals removal from industrial wastewater. Resorcinol formaldehyde carbon xerogels were synthesised by sol-gel polymerization of resorcinol (R) with formaldehyde (F) in the presence of sodium carbonate (C) and then vacuum dried. Resorcinol formaldehyde (RF) gels were synthesised at same temperature conditions with varying resorcinol ! catalyst (R/C) and resorcinol/ water (R/W) ratios. The characterization of the resorcinol for
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6

Aquino, Aline Scaramuzza. "Imobiliza??o de l?quidos i?nicos formados pelo c?tion 1-metil-3-(3-trimetoxissililpropil) imidaz?lio em MCM-41 por ancoragem e em xerogel para uso em captura e convers?o de CO2." Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2014. http://tede2.pucrs.br/tede2/handle/tede/3266.

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Made available in DSpace on 2015-04-14T13:59:10Z (GMT). No. of bitstreams: 1 461415.pdf: 6198256 bytes, checksum: 6cdd5f041ea076372230494bb7dfd45b (MD5) Previous issue date: 2014-07-30<br>The study to new materials for CO2 capture indicates as an option, the use of ionic liquids as solvents for absorption, because they are compounds in which CO2 has a preferential solubility. Ionic liquids immobilized in mesoporous materials may present an advantageous combination in selective capture. Thus, the objective of the doctoral thesis is to synthesize and characterize structures of ionic liquids su
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7

Aquino, Aline Scaramuzza. "Imobilização de líquidos iônicos formados pelo cátion 1-metil-3-(3-trimetoxissililpropil) imidazólio em MCM-41 por ancoragem e em xerogel para uso em captura e conversão de CO2." Doctoral thesis, Pontifícia Universidade Católica do Rio Grande do Sul, 2014. http://hdl.handle.net/10362/15981.

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Made available in DSpace on 2014-09-20T02:01:21Z (GMT). No. of bitstreams: 1 000461415-Texto+Completo-0.pdf: 6198256 bytes, checksum: 6cdd5f041ea076372230494bb7dfd45b (MD5) Previous issue date: 2014<br>The study to new materials for CO2 capture indicates as an option, the use of ionic liquids as solvents for absorption, because they are compounds in which CO2 has a preferential solubility. Ionic liquids immobilized in mesoporous materials may present an advantageous combination in selective capture. Thus, the objective of the doctoral thesis is to synthesize and characterize structures of io
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8

Aquino, Aline Scaramuzza. "Imobilização de líquidos iônicos formados pelo cátion 1-metil-3-(3-trimetoxissililpropil) imidazólio em MCM-41 por ancoragem e em xerogel para uso em captura e conversão de CO2." Pontifícia Universidade Católica do Rio Grande do Sul, 2014. http://hdl.handle.net/10923/6826.

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Made available in DSpace on 2014-09-20T02:01:21Z (GMT). No. of bitstreams: 1 000461415-Texto+Completo-0.pdf: 6198256 bytes, checksum: 6cdd5f041ea076372230494bb7dfd45b (MD5) Previous issue date: 2014<br>The study to new materials for CO2 capture indicates as an option, the use of ionic liquids as solvents for absorption, because they are compounds in which CO2 has a preferential solubility. Ionic liquids immobilized in mesoporous materials may present an advantageous combination in selective capture. Thus, the objective of the doctoral thesis is to synthesize and characterize structures of io
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9

Guazzagaloppa, Jérémy. "Matériaux super-isolants thermiques à propriétés thermoélectriques intégrées." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS086.

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Dans le cadre du développement de nouvelles sources d’énergie durables, la récupération d'énergie est essentielle. La plupart des processus industriels entraînent une perte colossale de chaleur, la thermoélectricité a donc pleinement son rôle à jouer dans ce développement grâce à l'effet Seebeck qui consiste à convertir un gradient de température en énergie électrique. Un bon matériau thermoélectrique nécessite une conductivité électrique σ élevée, un grand coefficient Seebeck α ainsi qu'une conductivité thermique λ faible. Cependant, malgré de récentes avancées dans le domaine, l’utilisation
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10

Amaral-Labat, Gisèle. "Gels poreux biosourcés : production, caractérisation et applications." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0081/document.

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Ce travail de recherche présente la préparation et la caractérisation de matériaux monolithiques hautement poreux dérivés majoritairement de ressources naturelles. L'objectif était de préparer de nouveaux gels biosourcés jusqu'à 91%, de proposer des alternatives au séchage supercritique au CO2, et d'étudier quelques propriétés d'intérêt de tels gels après séchage, non seulement à l'état organique mais, dans certains cas, après pyrolyse pour obtenir des gels de carbone. A ces fins, le tannin et le soja ont été testés comme précurseurs, à différentes concentrations et différents pH, et trois voi
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11

Gheorghiu, Constanta Cristina. "Inmovilización de catalizadores homogéneos en materiales de carbón nanoestructurados." Doctoral thesis, Universidad de Alicante, 2013. http://hdl.handle.net/10045/35828.

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12

Cárdenas-Arenas, Andrea. "Ni-based catalysts supported on CeO2 for CO2 valorisation." Doctoral thesis, Universidad de Alicante, 2021. http://hdl.handle.net/10045/115053.

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Esta Tesis Doctoral se ha enfocado en el diseño y síntesis de catalizadores de NiO-CeO2 para la metanación de CO2 y el reformado seco de metano, como alternativas para la revalorización de CO2. Concretamente, se ha estudiado el mecanismo de reacción de la metanación de CO2 sobre sistemas catalíticos NiO-CeO2 y se han optimizado los sitios activos implicados en esta reacción. Además, se ha estudiado la influencia de la morfología de los catalizadores NiO-CeO2 en su comportamiento catalítico para la reacción de metanación de CO2 utilizando diferentes tipos de materiales, como nanopartículas, nan
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13

Kumari, Manjari. "Catalytic wet air oxidation of effluent containing2, 4, 6-trichlorophenol using carbon xerogel based mono and bimetallic catalysts." Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7780.

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14

Weber, Christian. "Electrochemical Energy Storage: Carbon Xerogel-Manganese Oxide Composites as Supercapacitor Electrode Materials." Doctoral thesis, 2015. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-130748.

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Electrochemical double layer capacitors (EDLC), most commonly referred to as “supercapacitors”, have gained increasing scientific and commercial interest in recent years. Purely electrostatic charge storage processes allow charge- and discharge cycles in the second-time scale, exhibiting a theoretical capacitance in the order of 100 F per gram of electrode material, thereby providing efficient recuperation devices for electromechanical processes, for example. Introducing electrochemically active materials such as manganese oxides into the supercapacitor electrode, allows to combine the double-
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15

Quach, Nguyen-Khanh-Nguyen, and 郭阮慶嫄. "Preparation and electrical double-layer capacitor's application of carbon xerogel by sol-gel method." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6b45ag.

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博士<br>國立高雄應用科技大學<br>化學工程與材料工程系博碩士班<br>105<br>Glacial acetic acid was used as a catalyst in the preparation process of carbon xerogels from the condensation of resorcinol and formaldehyde for shortening significantly the gelation time. Subsequently, the carbon xerogels were activated by the chemical agent KOH. The effect of the resorcinol/catalyst ratio over a large range of 2 to 500, the solvent exchange manner with acetone, the pyrolysis temperature and the activation temperature by KOH in range of 700 to 1000 oC on the characteristic properties of the carbon xerogels were investigated. At a
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