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Tesis sobre el tema "Porous silicas"

Autor: Grafiati
Publicado: 25 de mayo de 2024
Última modificación: 31 de julio de 2025

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1

Kothalawala, Kothalawalage Nuwan. "Nanoporous high surface area silicas with chelating groups for heavy metal ion adsorption from aqueous solution /." View online, 2010. http://repository.eiu.edu/theses/docs/32211131524422.pdf.

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2

Hondow, Nicole S. "The synthesis of new heterogeneous Fischer-Tropsch catalysts : the incorporation of metal aggregates in mesoporous silicas." University of Western Australia. School of Biomedical, Biomolecular and Chemical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0083.

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Transition metals have been extensively studied as catalysts, and certain metals are known to be highly selective and active for certain processes. It is possible to use metal clusters as models for reactions occurring at metal surfaces, but it is often found that in practical applications these complexes are unstable and break down. It is possible to support or stabilise a metal species on, or in, an inorganic framework, making heterogeneous catalysts. A study of metal cluster chemistry with mixed-donor phosphine ligands was conducted, with several new ruthenium complexes synthesised. The che
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3

Lazaro, A., J. W. Geus, and H. J. H. Brouwers. "Influence of the Production Process Conditions on the Specific Surface Area of Olivine Nano-Silicas." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34893.

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The production of nano-silica by the olivine route is a cheaper and greener method than the commercial methods (neutralization of sodium silicate solutions and the flame hydrolysis) because of the low cost of raw materials and the low energy requirements. The produced olivine nano-silica has a specific surface area between 100-400 m2/g and primary particles between 10 to 25 nm (agglomerated in clusters). The process conditions and the ripening process influence the properties of nano-silica in the following ways i) the cleaner the nano-silica is the higher the specific surface area is; i
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4

Zhou, Wen-Juan. "Polyamine and Schiff base metal complexes incorporated in mesostructured templated porous silicas : tentative application in selective oxidation." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2009. http://tel.archives-ouvertes.fr/tel-00533599.

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De nouveaux matériaux ont été conçus à partir de matériaux hybrides organique-inorganiques mésoporeux renfermant des complexes de Cu(II). Ils ont été mis en œuvre comme catalyseurs dans des réactions d'oxydation sélective. La localisation des sites du métal a été contrôlée en utilisant trois ligands synthétiques le type organosilane et deux stratégies différentes, c. àd.,une synthèse dite "one-pot", et un greffage post-synthètique. Les organosilanes ont été le N-(2-aminoéthyl)-3-aminopropyltriméthoxysilane (L1), le N-propylamine-salicylaldimine-triméthoxy-silane (L2) et le de N-(salicylaldimin
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5

Zhou, Wen-Juan. "Polyamine and Schiff base metal complexes incorporated in mesostructured templated porous silicas : tentative application in selective oxidation." Phd thesis, Lyon, École normale supérieure (sciences), 2009. http://www.theses.fr/2009ENSL0527.

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De nouveaux matériaux ont été conçus à partir des matériaux hybrides organique-inorganiques mésoporeux renfermant des complexes de Cu(II). Ils ont été mis en œuvre comme catalyseurs dans des réactions d'oxydation sélective. La localisation des sites du métal a été contrôlée en utilisant trois ligands synthétiques le type organosilane et deux stratégies différentes, c'est-à-dire, une synthèse dite « one-pot », et un greffage post-synthètique. Les organosilanes ont été le N-(2-aminoéthyl)-3-aminopropyltriméthoxysilane (L1), le N-propylamine-salicylaldimine-triméthoxy-silane (L2) et le de N-(sali
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6

Fernandes, Leandro. "Desenvolvimento e controle da microestrutura de cerâmicas porosas à base de mulita para aplicações em isolamento térmico de alta temperatura." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-05092018-084646/.

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Mulita é um aluminosilicato com aplicações em sistemas de altas temperaturas como filtração de gases, elemento estrutural, suporte catalítico e isolante térmico. Na natureza, a mulita é pouco abundante e por este motivo é sintetizada via reação do estado sólido entre precursores contendo alumina e sílica. Nesta tese foi estudado o efeito de diferentes tipos de sílicas amorfas sintéticas (sílica precipitada, microssílica, sílica da casca de arroz e sílica da cinza da casca de arroz). Resultados obtidos demonstraram que quanto maior for a porosidade interna das partículas maior é o ganho em módu
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7

Maouacine, Koceila. "Matériaux hybrides poreux silice/polymère comme électrolytes pour batterie lithium-ion tout solide." Electronic Thesis or Diss., Aix-Marseille, 2023. http://www.theses.fr/2023AIXM0024.

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La conception de batteries lithium-ion utilisant un électrolyte solide est actuellement l’une des voies les plus étudiées pour s’affranchir des problèmes de sécurité lié à ces dispositifs. Dans ces travaux de thèse, nous proposons une nouvelle approche d'élaboration d'un électrolyte hybride poreux silice/polymère, contenant une fraction massique plus élevée de silice mésoporeuse que de polymère. Deux morphologies de matériaux hybrides de silice ont été étudiées : sous forme de poudres compressées (pastilles) et sous forme de films minces. Dans la première partie du travail, une poudre de silic
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8

Menard, Samuel. "Périphérie triac à base de silicum poreux." Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4022/document.

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Ces travaux de thèse portent sur le développement d’une périphérie innovante de TRIAC exploitant le caractère semiisolant du silicium poreux (PS). L’intégration de caissons PS type P à partir des profils de dopage du TRIAC est en effet accessible. Une revue des propriétés électriques du PS type P réalisée à partir de nos propres échantillons méso voire micro-poreux a donc été entreprise. Des mesures de capacités et des relevés I-V ont ainsi permis de déterminer l’évolution de la constante diélectrique relative du PS ainsi que sa résistivité en fonction de la porosité. Plus cette dernière est é
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9

Raachini, Rita. "Nanoparticles of Ni strongly embedded in porous silica : towards the design of efficient catalysts for lignin hydrogenolysis." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS540.

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Les phénols peuvent être obtenus à partir de la lignine plutôt que du pétrole. Notre principale préoccupation était d’améliorer la conversion de la lignine par hydrogénolyse, tout en limitant l’hydrogénation des phénols produits en utilisant des catalyseurs à base de Ni au lieu de métaux nobles. Des matériaux constitués de Ni hautement dispersés sur la silice ont été synthétisés de différentes matières, caractérisés avant et après réduction sous H2, puis testés dans l'hydrogénolyse de trois composés comportant des liaisons C-OAryl, comme dans liaison β-O-4 de la lignine, en utilisant l’isoprop
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10

Azevedo, Raquel Cristina de Souza. "Síntese e caracterização de um sistema multifuncional SBA-16/Nanopartículas magnéticas/gel polimérico para bioaplicações." CNEN - Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2014. http://www.bdtd.cdtn.br//tde_busca/arquivo.php?codArquivo=316.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>A combinação do material mesoporoso SBA-16 com o gel polimérico poli(N-isopropilacrilamida) contendo nanopartículas magnéticas pode conduzir à formação de um material híbrido interessante para aplicação em magnetohipertemia e liberação controlada de fármacos. Neste trabalho, foi explorada a estratégia de síntese de um sistema multifuncional, constituído por SBA-16/Fe3O4/P(N-iPAAm) com o objetivo de avaliar sua potencialidade de geração de calor a partir da magnetita e sua contribuição nos estudos de liberação controlada de fármacos
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11

Mueller, Paul S. "Synthesis of silica based porous nanomaterials." Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/1368.

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Silica is one of the most abundant elements on the planet, has flexible bonding properties and generally excellent stability. Because of these properties, silica has been a vital component in technologies ranging from ancient glassware to modern supercomputers. Silica is able to form a wide range of materials both alone and as a component of larger material frameworks. Porous silica based nanomaterials are rapidly growing in importance because of their many applications in a wide variety of fields. This thesis focuses on the synthesis of silica based porous nanomaterials: nanocrystalline zeoli
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12

Karlsson, Linda. "Biomolecular interactions with porous silicon /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2003/tek804s.pdf.

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13

Wielgosz, R. I. "Electrochemical studies of porous silicon." Thesis, University of Bath, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296302.

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14

Boswell, Emily. "Field emission from porous silicon." Thesis, University of Oxford, 1997. http://ora.ox.ac.uk/objects/uuid:a4344196-7fc2-4713-b47b-85920b137759.

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Vacuum microelectronic (VME) devices are of interest for the development of flat-screen displays and microwave devices. In many cases, their operation depends on the field emission of electrons from micron-sized cathodes (semiconductor or metal), into a vacuum. Major challenges to be met before these devices can be fully exploited include obtaining - low operating voltages, high maximum emission currents, uniform emission characteristics, and long-term emission stability. The research in this thesis concerns the production of silicon field emitters and the improvement of their emission propert
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15

Koker, Lynne. "Photoelectrochemical formation of porous silicon." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368290.

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16

Zheng, Wan Hua. "Photoluminescence study of porous silicon." HKBU Institutional Repository, 1998. http://repository.hkbu.edu.hk/etd_ra/138.

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17

Ngan, Mei Lun. "Photoluminescence excitation of porous silicon." HKBU Institutional Repository, 1998. http://repository.hkbu.edu.hk/etd_ra/139.

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18

DEMONTIS, VALERIA. "Porous Silicon applications in biotechnology." Doctoral thesis, Università degli Studi di Cagliari, 2007. http://hdl.handle.net/11584/266040.

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Biotechnology is a field in great expansion and the continuous boost for obtaining smaller and more efficient devices stimulates the increase of interest from the research community. Nanostructured materials, and among them porous silicon (PS), appear to be good candidates for coupling with biological molecules because of their peculiar characteristics. In the case of porous silicon, the most noticeable are the very large specific area, which allows the loading of large amounts of biological material in a very small volume, and the possibility to easily tailor the pore size and morphology as f
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19

Stupakova, Jolanta. "Physical properties of porous silicon nanostructures under influence of microwave radiation." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2008. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2008~D_20080207_161717-66613.

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Just after discovery of porous silicon (PSi) there was clarified that its wide application in various fields opens new unexpected possibilities. One of the possibilities of products of porous silicon in microwave (MW) technique is carried out in the USA now. The propagation of MWs in PSi layers is under investigation. It has been shown that radio and optoelectronic connectors made from this material have low losses and can be applied to improve technique of cellular phone communication as well as other high frequency technique. It is obvious that the next element following the connector has to
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20

Riachy, Philippe. "Hierarchically Porous Silica Materials for the Encapsulation of Molecules of Interest." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0013/document.

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Ce travail porte sur la préparation de matériaux silicatés à porosité hiérarchisée pour l'encapsulation de molécules d'intérêt dans le domaine de la pharmacie et en tant que biocatalyseur. Afin d’atteindre cet objectif, les nano-émulsions sont choisies comme empreinte pour créer les macropores du matériau en raison de la taille homogène et réduite des gouttelettes de l’émulsion (inférieure à 100 nm). Pour cela le système Remcopal 4/décane/eau est investi en déterminant les conditions les plus optimales de formation de nano-émulsion, via les méthodes d'inversion de phases. L’ajout de micelles a
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21

Flower, Andrew. "Polymer adsorption at a porous interface." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343309.

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22

Mabrook, Mohammed Fadhil. "Fabrication and characterisation of porous silicon." Thesis, Sheffield Hallam University, 2000. http://shura.shu.ac.uk/19990/.

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A systematic study has been made of the electrical conduction processes through electrically etched porous silicon (PS) films sandwiched between two metal electrodes. The PS layers were formed by anodisation of p-type silicon wafers in a hydrofluoric (HF) acid solution. The effect of fabrication conditions on the structural and electrical properties of PS have been investigated. The thickness of PS layers was found to depend on the anodisation time, whereas porosity was regarded to be controlled by the current density and HF acid concentration. The dark current-voltage I(V) characteristics at
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23

Squire, E. K. "Light emitting microstructures in porous silicon." Thesis, University of Bath, 1999. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285287.

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24

Ben, Ghozi-Bouvrande Justine. "Les liquides poreux : un nouveau concept pour la séparation chimique." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2022. http://theses.enscm.fr/ENSCM_2022_BENGHOZI-BOUVRANDE.pdf.

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Les composés organiques volatiles étant un problème environnemental majeur, des alternatives à l’extraction liquide-liquide qui utilisent des solvants en grande quantité sont au cœur des recherches. Les liquides poreux à base de silice sont un nouveau type de matériau liquide, original et versatile, composés de nanoparticules greffées par des fonctions ioniques. De par leur forte versatilité et leur volatilité nulle, ce type de liquide représente un candidat prometteur pour remplacer les phases organiques de l’extraction liquide-liquide. Après un état de l’art des différents types de liquides
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25

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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26

Fowler, Christabel Emma. "Templating strategies for the formation of porous silica." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364903.

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27

Fedeyko, Joseph M. "Silica phase behavior and the formation of microporous and mesoporous materials." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 5.93 Mb., 258 p, 2006. http://proquest.umi.com/pqdlink?did=1172110321&Fmt=7&clientId=79356&RQT=309&VName=PQD.

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28

Noble, Kate. "Preparation of organically modified mesoporous materials via sol-gel processing." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340139.

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29

Ezzeddine, Zeinab. "Divalent heavy metals adsorption on various porous materials : removal efficiency and application." Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2315/document.

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L'accès à l'eau potable est indispensable au développement de la vie. La pollution, liée aux activités anthropiques, constitue une menace pour la santé humaine et pour les espèces sauvages. Parmi les nombreux polluants retrouvés dans les eaux, la pollution par les métaux lourds constitue un problème environnemental d'intérêt mondial en raison de leur toxicité élevée, même à des concentrations très faibles, et de leur persistance dans la nature. De nombreuses méthodes peuvent être mises en oeuvre pour l'élimination des métaux lourds dans l'eau. Parmi elles, les procédés d'adsorption sont très a
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30

DeBoer, John Raymond. "Evaluation Methods for Porous Silicon Gas Sensors." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4971.

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This study investigated the behavior of porous silicon gas sensors under exposure to CO, NO, and NH3 gas at the part per million level. Parameters of interest in this study included the electrical, environmental, and chemi-resistive performance associated with various porous silicon morphologies. Based upon the variability of preliminary results, a gas pulsing method was combined with signal processing in order to analyze small impedance changes in an environment of substantial noise. With this technique, sensors could be effectively screened and characterized. Finally this method was comb
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31

Pap, A. E. (Andrea Edit). "Investigation of pristine and oxidized porous silicon." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514277759.

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Abstract While numerous publications deal with the properties and applications of porous silicon (PS), some of the related topics are not complete or could be investigated from different aspects. Therefore, the main objective of this thesis is to provide novel information associated with the optical and chemical properties of PS. For the investigations, various PS samples are manufactured by electrochemical dark etching of boron-doped p+-type Si wafers. Amongst others, (i) the wavelength-dependent refractive indices of freestanding PS monolayers having different porosities were obtained from
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32

余家訓 and Ka-fan Yu. "Scanning probe microscopy of porous silicon formation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31222110.

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33

Barker, Carolyn Marie. "Catalytic processes in porous transition metal silicates." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271958.

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34

Chang, Wai-Kit. "Porous silicon surface passivation and optical properties." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41426.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.<br>"June 1996."<br>Includes bibliographical references (leaves 84-85).<br>by Wai-Kit Chang.<br>S.M.
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35

To, Wai Keung. "Tunable wavelength from porous silicon-based devices." HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1094.

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36

Tsuboi, Takashi. "Structure and Properties of Porous Silicon Surface." Kyoto University, 1999. http://hdl.handle.net/2433/181681.

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37

Tobail, Osama. "Porous silicon for thin solar cell fabrication." Aachen Shaker, 2008. http://d-nb.info/992052904/04.

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38

Kodumuri, Pradeep. "IN-SITU GROWTH OF POROUS ALUMINO-SILICATES AND FABRICATION OF NANO-POROUS MEMBRANES." Cleveland State University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1243304850.

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39

Goubert-Renaudin, Stéphanie. "Synthèse, caractérisation et réactivité en milieu aqueux de matériaux à base de silice fonctionnalisée par des ligands dithiocarbamate et cyclame." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10127/document.

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La fonctionnalisation de silices mésoporeuses par des ligands dithiocarbamate et cyclame a été réalisée. La réactivité des solides en milieu aqueux a été étudiée afin d’évaluer leur potentiel pour des applications de type capteurs électrochimiques. La synthèse originale de siloxydithiocarbamates a conduit à une nouvelle voie de préparation de silices fonctionnalisées par greffage direct du dérivé silylé sur le matériau. Des silices mésoporeuses ordonnées ou non (K60, SBA15, MCM41) portant des fonctions dithiocarbamate ont ainsi été obtenues. Des matériaux analogues ont aussi été préparés selon
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40

Li, Wenle. "Study of Freeze-Cast Porous Silica Nanoparticle-Based Composites." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/38770.

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Porous silica-based nanocomposites are promising ceramics, as they exhibit high specific surface area, highly porous network, and a surface that can be easily functionalized. This dissertation describes the results of a study on the formation and properties of porous silica nanoparticle-based composites, using techniques of freeze casting and sintering. Kaolinite platelets and silica nanorods were added into the nanoparticle system, and their effects on modifying the porous microstructures and physical properties were investigated. During freeze casting, homogeneous microstructures with hig
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41

Chen, Chien-Cheng. "OPTICAL MEASUREMENT OF ENVIRONMENTAL URANIUM USING POROUS SILICA MATERIALS." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2241.

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The focus of this research is on the optical measurement of uranyl in a solid matrix using fluorescence spectroscopy. Nanoporous silica-based materials were used to extract uranyl from contaminated soil and to enhance the fluorescence intensity and lifetime. The fluorescence lifetime and intensity of uranyl ions adsorbed on porous silica-based materials of varying pore size was measured as a function of pH and in the presence of fluoride. The feasibility of uranyl fluorescence detection on the top of soil by silica gel is carried out by four types of natural soil. The results show that the u
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42

Silva, Francisco Wellery Nunes. "Transporte eletrônico em semicondutores porosos baseado na equação de Schrodinger dependente do tempo." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/11710.

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SILVA, Francisco Wellery Nunes. Transporte eletrônico em semicondutores porosos baseado na equação de Schrodinger dependente do tempo. 2012. 77 f. Dissertação (Mestrado em Física) - Programa de Pós-Graduação em Física, Departamento de Física, Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2012.<br>Submitted by Edvander Pires (edvanderpires@gmail.com) on 2015-04-23T21:11:22Z No. of bitstreams: 1 2012_dis_fwnsilva.pdf: 12829801 bytes, checksum: 1fca3d2dc15fc07961d7231c6087fe50 (MD5)<br>Approved for entry into archive by Edvander Pires(edvanderpires@gmail.com) on 2015-04-29T17:38:2
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43

Haryadi, Haryadi Chemistry Faculty of Science UNSW. "Porous hybrid organic-inorganic silica materials: preparation, structural and transport properties." Awarded by:University of New South Wales. School of Chemistry, 2005. http://handle.unsw.edu.au/1959.4/28806.

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The aim of this project was to prepare a series of silica materials based on sol-gel processing of alkoxysilanes using glucose and glycerol as templates for potential applications in membrane design for pervaporation. The materials were characterized using structural and dynamic techniques to gain information about the effect of the templates on the formation of micro- and mesoporous silicates. The interaction between templates and silica matrices were investigated using FTIR, Raman Spectroscopy, Solid State NMR Spectroscopy, Physisorption and SEM. Close contact between templates and silica ne
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44

Coleman, Nicholas Richard Boldero. "Direct liquid crystal templating of mesoporous silica and platinum." Thesis, University of Southampton, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302011.

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45

Alvarez, Sara D. "Stability and biocompatability of porous silicon and porous alumina for cell and biomolecular sensing." Diss., [La Jolla, Calif.] : University of California, San Diego, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3338847.

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Thesis (Ph. D.)--University of California, San Diego, 2008.<br>Title from first page of PDF file (viewed Jan. 13, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 126-141).
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46

Newby, Pascal. "Fabrication de semiconducteurs poreux pour am??liorer l'isolation thermique des MEMS." Thèse, Universit?? de Sherbrooke, 2014. http://savoirs.usherbrooke.ca/handle/11143/98.

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R??sum?? : L???isolation thermique est essentielle dans de nombreux types de MEMS (micro-syst??mes ??lectro-m??caniques). Elle permet de r??duire la consommation d?????nergie, am??liorer leurs performances, ou encore isoler la zone chaude du reste du dispositif, ce qui est essentiel dans les syst??mes sur puce. Il existe quelques mat??riaux et techniques d???isolation pour les MEMS, mais ils sont limit??s. En effet, soit ils ne proposent pas un niveau d???isolation suffisant, sont trop fragiles, ou imposent des contraintes trop importantes sur la conception du dispositif et sont difficiles ??
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47

Newby, Pascal. "Fabrication de semiconducteurs poreux pour améliorer l'isolation thermique des MEMS." Thèse, Université de Sherbrooke, 2014. http://savoirs.usherbrooke.ca/handle/11143/98.

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Résumé : L’isolation thermique est essentielle dans de nombreux types de MEMS (micro-systèmes électro-mécaniques). Elle permet de réduire la consommation d’énergie, améliorer leurs performances, ou encore isoler la zone chaude du reste du dispositif, ce qui est essentiel dans les systèmes sur puce. Il existe quelques matériaux et techniques d’isolation pour les MEMS, mais ils sont limités. En effet, soit ils ne proposent pas un niveau d’isolation suffisant, sont trop fragiles, ou imposent des contraintes trop importantes sur la conception du dispositif et sont difficiles à intégrer. Une app
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48

Al-Ajili, Adwan Nayef Hameed. "Photoluminescence of nanostructured silicon." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/26999.

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The photoluminescence (PL) emitted by porous silicon has been investigated under different conditions of excitation using a pulsed nitrogen laser source, and the continuous tunable DV synchrotron source at Daresbury Laboratory. The project involved sample preparation, and PL measurements using a custom-built optical laser-based system for lifetime measurements. This in itself necessitated software and hardware development to enable interfacing and data-logging using an IBM-compatible PC. The equipment development formed a major part of the project.
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49

CALABRESE, Gabriele. "Relaxed germanium epilayers on porous silicon buffers for low dislocation content Ge on Si virtual substrates." Doctoral thesis, Università degli studi di Ferrara, 2015. http://hdl.handle.net/11392/2389093.

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While silicon represents the dominant material in the semiconductor industry, the continuous improvement in the performance of Si based devices is reaching its upper bound due to the approaching of insuperable physical limitations intrinsic to Si, which requires the introduction of new semiconductor materials and the development of new assembly techniques to guarantee the future performance improvement and reduction in fabrication costs. The integration of high-quality germanium epilayers on Si substrates has received great attention from the semiconductor community due to the chance to extend
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50

Khung, Yit Lung, and y. khung@unsw edu au. "Porous Silicon Structures for Biomaterial and Photonic Applications." Flinders University. School of Chemistry, Physics and Earth Sciences, 2009. http://catalogue.flinders.edu.au./local/adt/public/adt-SFU20090421.145533.

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The primary research aim in this thesis is to demonstrate the versatility of porous silicon based nanomaterials for biomaterial and photonic applications. In chapter 2 of this thesis, the suitability of porous silicon as a biomaterial was investigated by performing different surface modifications on the porous silicon films and evaluating biocompatibility of these surfaces in vitro. The porous silicon surfaces were characteriszed by means of atomic force microscopy (AFM), scanning electron microscopy (SEM), diffuse reflectance infrared spectroscopy (DRIFT) and interferometric reflectance spect
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