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Tesis sobre el tema "Titania (Chemical)"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 18 de febrero de 2022

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1

Sotelo-Vazquez, C. "Modification of titania films by chemical vapour deposition for enhanced photocatalysis." Thesis, University College London (University of London), 2017. http://discovery.ucl.ac.uk/1553144/.

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Titanium dioxide (TiO2) is the leading material for self-cleaning applications due to its intrinsic properties, such as chemical inertness, mechanical robustness, high photocatalytic activity and durability to extend photocatalytic cycling. However, its relatively wide bandgap limits its outdoor applications. There has been a strenuous effort to try and improve the photocatalytic efficiency of TiO2, in particular by modifying its electronic structure to enhance its function under solar illumination. The most commonly studied approaches for achieving this have been to incorporate anionic and/or

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2

Liao, Xiaohong. "The synthesis of nano titania particles using a DC transferred arc plasma reactor." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104690.

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The effect of quench conditions on the properties of titanium dioxide produced using atransferred arc process was studied. Rutile phase TiO2 in the form of micron sized powder wasdecomposed and vaporized in a continuous feed DC transferred arc system. The hot gas streamexiting the reactor contained a mixture of the decomposition products of titania includingtitanium suboxides (TiO, Ti2O3), argon (Ar), and oxygen (O2). Rapid quenching of this gasstream with dry air resulted in the production of a titania aerosol. Collection of the product tookplace in the filtration system. The quench condition

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3

Yoshikawa, Naruo. "The chemical and photochemical reactivity of modified and unmodified high area titania surfaces." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343010.

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4

Kang, Chin-Shuo. "CONTROL OF TITANIUM DIOXIDE NANOFIBER CRYSTALLINITY, PARTICLE SIZE AND MORPHOLOGY." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron161960479044817.

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5

Stewart, Gregory D. "Numerical simulation of titania deposition in a cold-walled impinging jet type APCVD reactor." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1178908165.

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6

PENA, DONOVAN ALEXANDER. "DEVELOPMENT AND CHARACTERIZATION OF MIXED OXIDE CATALYSTS FOR THE SELECTIVE CATALYTIC REDUCTION OF NITRIC OXIDE FROM STATIONARY SOURCES USING AMMONIA." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054307250.

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7

Kafizas, A. G. "Combinatorial atmospheric pressure chemical vapour deposition for optimising the functional properties of titania thin-films." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1334459/.

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Titanium dioxide (TiO2) is the leading material for self-cleaning applications due to its chemical inertness, mechanical robustness, durability to extended photocatalytic cycling, low cost and high photocatalytic activity. There has been a concerted effort to try and improve the material’s functional properties through impurity doping; altering the band structure and electronic transport properties. However, any improvements are difficult to optimise using traditional methods. Thin-film combinatorial methods have heralded the discovery of more than 20 new families of materials since their resu

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8

Marszewski, Michal. "Development of highly porous crystalline titania photocatalysts." Kent State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=kent1476281107453411.

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9

Hodgkinson, John L. "Atmospheric pressure glow discharge plasma enhanced chemical vapour deposition of titania and aluminium based thin films." Thesis, University of Salford, 2009. http://usir.salford.ac.uk/26717/.

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Atmospheric pressure glow discharge (APGD) plasma CVD was used to deposit thin films of titania at 200 °C using two different precursors. The resulting films were characterised using techniques including XPS, RBS and XRD. It was established that annealing at temperatures as low as 275 °C produced crystalline films that were photocatalytically active. When annealed at 300 °C, the photoactivity was greater than that of a commercially available "self-cleaning" titania film. The effects of the different precursors, annealing times and temperatures on the crystallinity and photoactivity are discuss

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10

Pettit, Sandra L. "Investigation of TiO2 and InVO4-TiO2 Semiconductors for the Photocatalytic Degradation of Aqueous Organics." Scholar Commons, 2014. https://scholarcommons.usf.edu/etd/5103.

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Water is a vital natural resource. To develop more sustainable water systems, we must focus efforts on the removal of persistent contaminants. Aqueous organic contaminants include azo dyes, halogenated organics (e.g. pesticides), and algal and bacterial metabolites. The latter are common to surface waters and freshwater aquaculture systems and can cause taste and odor problems. Two of the principal organoleptic compounds are geosmin and 2-methylisoborneol (MIB). Traditional oxidation treatment methods, utilizing chlorine, hydrogen peroxide, and potassium permanganate, have been employed with v

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11

Karslioglu, Osman. "Photocatalytic And Photoelectrochemical Water Splitting Over Ordered Titania Nanotube Arrays." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610388/index.pdf.

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The objective of this study was to investigate photocatalytic water splitting over ordered TiO2 nanotube arrays. Synthesis of ordered nanotube arrays of titania, as a micron thick film on a titanium foil was accomplished by electrochemical anodization methods defined in the literature. Effect of two types of electrolyte (aqueous and organic) on the micro-morphology was observed by scanning electron microscopy. Optimum anodization times for the TiO2 nanotube electrodes, synthesized in ethylene glycol electrolyte, were different for acidic and basic electrolytes. Optimum times were determined as

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12

Sheerin, Ephraim A. "Synthesis of Ethanol from High Pressure Syngas over Rhodium-Based Catalysts." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397476742.

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13

Pickering, Jon W. "Applications of Optical Properties from Nanomaterials for Enhanced Activity of a Titania Photocatalyst under Solar Radiation." Scholar Commons, 2015. https://scholarcommons.usf.edu/etd/5760.

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In recent years, employing advanced oxidation processes (AOPs) as a means of wastewater remediation has emerged as a promising route towards maintaining a sustainable global water management program. The heterogeneous photocatalytic oxidation process has been of particular interest due to the prospective of utilizing solar radiation as the driving force behind the degradation of pollutants. Of the photocatalyst studied to date, TiO2 remains the most attractive material for environmental applications due to its affordability, stability, biocompatibility and high quantum yield. A key draw back h

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14

Yilmaz, Emre. "Sensitization Of Sol-gel Derived Titania-silica Photocatalytic Thin Films With Ascorbic Acid." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614226/index.pdf.

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The photocatalytic activity of semiconductor metal oxides can be improved by the addition of sensitizer which enhances the band gap by considerable red shift of the absorption edge of semiconductor. In the present study, the effect of ascorbic acid as sensitizer on the photocatalytic activity of titania-silica binary mixtures was studied. The SiO2-TiO2 mixtures having 50wt%Ti:Si composition were prepared with sol-gel method. The surface area and porosity of the samples were modified by using various amounts of polyethylene glycol (PEG) as template. The thin films of the samples were obtained b

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15

Frank, Marla Lea. "Novel strategies for design of high temperature titania-based gas sensors for combustion process monitoring." Connect to this title online, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1063808231.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xviii, 279 p.; also includes graphics (some color). Includes bibliographical references (p. 256-279).

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16

Lee, Seungjin. "Hydrolysis of organophosphorous esters induced by nanostructured titania-based replicas of diatom microshells." Thesis, Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-05192006-110527/.

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17

Sharma, Gaytri. "Synthesis and characterization of nanostructured Tungsta/Vanadia/Titania catalysts for the oxidation of dimethyl sulfide." Miami University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=miami1228163508.

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18

Li, Haitao. "Synthesis of Titanium Dioxide Photocatalyst with the Aid of Supercritical Fluids." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4912.

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Titanium Dioxide (TiO2) emerged as one of the most popular photocatalysts since 1970's. However, its photocatalytic activity requires UV irradiation due to its large band gap unless further functionalization or modifications are performed. Furthermore, recovery issue has always been a major drawback, if the more effective form nano particles are utilized. The key objectives of this research were synthesizing new TiO2 based photocatalyst systems that are effective with both the UV and the visible light while utilizing novel superior environmentally friendly techniques enabling development of na

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19

Zhou, Ming. "Novel photocatalytic TiO2-based porous membranes prepared by plasma-enhanced chemical vapor deposition (PECVD) for organic pollutant degradation in water." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS090/document.

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Le dépôt chimique en phase vapeur assisté par plasma est appliqué pour préparer des couches minces amorphes de TiO2 à basse température. Un recuit à 300 °C pendant un temps minimum de 4,5 h permet de former la phase cristalline anatase. Les principales caractéristiques de ces couches minces comme leur structure cristalline, leur microstructure, leur largeur de bande interdite et leur hydrophilie de surface, sont déterminées. Leurs performances fonctionnelles comme photocatalyseurs sont d'abord examinées selon le test breveté par Pilkington, consistant à éliminer sous irradiation UV de l'acide

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20

Miller, Duane D. "In Situ Infrared Spectroscopy Study of Gold Oxidation Catalysis." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1152205534.

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21

Kumar, Prateek. "Heat Capacity and Oxidation Kinetic Studies of Fe-Ti Composite Metal Oxide (ITCMO) using Simultaneous Differential Scanning Calorimetry and Thermogravimetric Analysis." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1502723527531035.

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22

Liu, Chang. "The spectroscopic and structural characterization of chlorine modification of MoOx catalysts supported over silica/titania mixed oxides for the oxidative dehydrogenation of ethane and propane." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1095645498.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xiv, 157 p.; also includes graphics. Includes bibliographical references (p. 145-153).

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23

Vernon, Jonathan P. "Morphology-preserving chemical conversion of bioorganic and inorganic templates." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/47521.

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The generation of nanostructured assemblies with complex (three-dimensional, 3D) self-assembled morphologies and with complex (multicomponent) tailorable inorganic compositions is of considerable technological and scientific interest. This research demonstrates self-assembled 3D organic templates of biogenic origin can be converted into replicas comprised of numerous other functional nanocrystalline inorganic materials. Nature provides a spectacular variety of biologically-assembled 3D organic structures with intricate, hierarchical (macro-to-micro-to-nanoscale) morphologies. Morphology-pres

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24

Torres, Heredia Victor Elias. "Silver nanostructures: chemical synthesis of colloids and composites nanoparticles, plamon resonance properties and silver nanoparticles monolayer films prepared by spin-coating." Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/52807.

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El presente trabajo tiene como objetivo desarrollar en solución acuosa y a tem-peratura ambiente, rutas de síntesis química coloidal de nanopartículas de plata y nano-partículas compuestas estables. Se obtienen nanopartículas de plata reproducibles, con un control morfológico de tamaño y forma durante el proceso de síntesis. Llevamos a cabo el estudio de las propiedades ópticas (espectros de absorción de las resonancias de plasmones superficiales (SPR)) que caracterizan a una determinada forma y tamaño. El análisis incluye estructuras nanométricas de plata de diferentes tamaños, en ambientes d

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25

Drews, Aaron M. "Control of Thermal Expansion Coefficient of a Metal Powder Composite via Ceramic Nanofiber Reinforcement." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1248114951.

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26

Klettlinger, Jennifer Lindsey Suder. "Fischer-Tropsch Cobalt Catalyst Improvements with the Presence of TiO2, La2O3, and ZrO2 on an Alumina Support." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333981467.

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27

Nagpure, Suraj R. "SYNTHESIS OF TITANIA THIN FILMS WITH CONTROLLED MESOPORE ORIENTATION: NANOSTRUCTURE FOR ENERGY CONVERSION AND STORAGE." UKnowledge, 2016. http://uknowledge.uky.edu/cme_etds/67.

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This dissertation addresses the synthesis mechanism of mesoporous titania thin films with 2D Hexagonal Close Packed (HCP) cylindrical nanopores by an evaporation-induced self-assembly (EISA) method with Pluronic surfactants P123 and F127 as structure directing agents, and their applications in photovoltaics and lithium ion batteries. To provide orthogonal alignment of the pores, surface modification of substrates with crosslinked surfactant has been used to provide a chemically neutral surface. GISAXS studies show not only that aging at 4°C facilitates ordered mesostructure development, but al

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28

Coutinho, Cecil A. "Multi-functional composite materials for catalysis and chemical mechanical planarization." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002980.

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29

Pappas, Dimitrios. "Synthesis and Characterization of Novel Titanium Oxide Nanotubes - Applications as Catalyst Support for the Selective Catalytic Reduction of Nitrogen Oxides." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1397233960.

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30

Watson, Rick Bruce. "The physical, chemical, and structural characteristics of MoOx catalysts supported over the binary oxide of Silica/Titania and relationships to their behavior in the oxidative dehydrogenation of Propane and Ethane /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu14864018952095.

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31

Zibin, Hai. "Modification of Titania with Gold-Copper Bimetallic Nanoparticles and Preparation of Copper-Based Photocatalysts : Application in Water Treatment." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00926757.

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Photocatalysis is recently extensively studied because it implies a variety of potential industrial applications ranging from the hydrogen generation of water splitting to the treatment of waste water. Among all the semiconductors, TiO2 has attracted the most attention. But the rate of the electron-hole recombinations is very important and TiO2 is active only under UV light. Various methods are developed to enhance the photoactivity of TiO2. Other semiconductors like copper oxides and copper sulfides also attracted attention due to their lower band-gaps which allow applications in solar photoc

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32

Das, Saikat. "FUNDAMENTAL STUDIES OF SURFACTANT TEMPLATED METAL OXIDE MATERIALS SYNTHESIS AND TRANSFORMATION FOR ADSORPTION AND ENERGY APPLICATIONS." UKnowledge, 2015. http://uknowledge.uky.edu/cme_etds/48.

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This work addresses fundamental aspects of designing templates and curing conditions for the synthesis of mesoporous metal oxide thin films. The first section addresses selection of cationic-carbohydrate surfactant mixtures to synthesize templated silica thin films for selective adsorption of simple carbohydrates based on molecular imprinting. Nuclear magnetic resonance and fluorescence spectroscopy results suggest a novel structure for mixtures of alkyl glucopyranosides or xylopyranosides with cationic (trimethylammonium) surfactants. Despite thermodynamically favorable mixing, the carbohydra

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33

Inturi, Siva Nagi Reddy. "Nano-Catalyst Synthesized by Flame Spray Pyrolysis (FSP) for Visible Light Photocatalysis." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1511884949728835.

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34

Awaluddin, Amir. "Fundamental studies of chemical vapour deposition processes : Far-IR synchrotron studies of the adsorption of tim oxide precursors on tin oxide and direct liquid injection CVD growth of titania thin films on silicon." Thesis, University of Salford, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272929.

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35

Woods, Matthew P. "Activity and Selectivity in Oxidation Catalysis." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1228175906.

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36

Wang, Junwei. "Chemical doping of metal oxide nanomaterials and characterization of their physical-chemical properties." Case Western Reserve University School of Graduate Studies / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=case1333829935.

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37

Kandasamy, Ispran S. "Metalorganic chemical vapour deposited titanium dioxide thin films." Thesis, Brunel University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235909.

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38

Jacobsen, S. M. "Chemical, catalytic and spectroscopic properties of titanium (II)." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381356.

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39

Johnson, Saccha Ellen. "Atmospheric pressure chemical vapour deposition of titanium nitride from titanium tetrachloride and ammonia." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242208.

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40

Bastien, Samuel. "Selective chemical stripping of titanium aluminum nitride coating from titanium substrate using hydrogen peroxide and potassium oxalate." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=110474.

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Titanium Aluminum Nitride (TiAlN) is an important industrial coating that improves hardness and corrosion resistance. The objective of the present work is to develop chemical methods which selectively remove TiAlN coatings deposited on Titanium substrates. The selected stripping solution consists of hydrogen perox¬ide (H2O2) and potassium oxalate (K2C2O4). Coupons of Ti-6-4 coated with a notional 10 micron thick coating of TiAlN were exposed to a stripping solution at varying temperature and compositions. Overall, it was found that increasing the temperature of reaction or the concentration of

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41

Yamin, Yas. "Elaboration de photocatalyseurs à base de nanotubes de TiO2 modifiés par WO3 et ZnO : applications à l'élimination de méthyléthylcétone et de l'H2S sous illumination UV-A et solaire." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00869959.

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Il est couramment admis que le niveau de pollution dans l'environnement intérieur pouvait dépasser le niveau de pollution extérieur. C'est la raison pour laquelle la qualité de l'air intérieur est devenue une préoccupation sociétale importante en raison de la durée croissante que nous passons dans ces environnements. Les procédés d'oxydation avancée (POA), parmi lesquels l'oxydation photocatalytique, sont des techniques pertinentes pour la purification de l'air. En photocatalyse, les nanotubes de titane montrent un intérêt tout particulier en raison de leurs propriétés intrinsèques spécifiques

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42

Zhang, Jian. "Orthogonal chemical functionalization of titanium tungsten (TiW) based surfaces." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC030.

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Avec le développement de nouveaux dispositifs apparait le besoin d’être capable de contrôler la chimique de surfaces de substrats multi-échelle et multi-matériaux. Plusieurs techniques font appel à de la chimie localisée via différentes technologies. Une approche consiste à exploiter les différences de réactivités chimiques entre les différents matériaux du substrat et différents groupements chimiques de manière à fonctionnaliser sélectivement chaque matériaux pour former des couches minces organiques de type « Self Assembled Monolayer »: Ce principe proposée par Pr. G. M. Whitesides est appel

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43

Thomas, T. "Chemical vapour deposition of titanium and vanadium arsenide thin films." Thesis, University College London (University of London), 2011. http://discovery.ucl.ac.uk/1310479/.

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This thesis describes the chemical vapour deposition (CVD) of titanium and vanadium arsenide thin films. The compounds [TiCl4(AsPh3)], [TiCl4(AsPh3)2], [TiCl4(Ph2AsCH2AsPh2)], [TiCl4(tBuAsH2)n] have been synthesised from the reaction of TiCl4 with the corresponding arsine, and they have been investigated as potential single-source precursors to TiAs. Additionally, [TiCl3(NMe2)(μ-NMe2)2AsCl] has been synthesised from the reaction of TiCl4 and As(NMe2)3, and although was thought not to be a suitable single-source precursor to TiAs due to its lack of preformed Ti-As bonds, its use a potential sin

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44

Price, Timothy Simon. "Cold gas dynamic spraying of titanium coatings." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/12491/.

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Cold gas dynamic spraying, CGDS, is a relatively new technique used to deposit materials onto the surface of a substrate. It differs to the majority of other thermal spray techniques as the substrate and particles are not exposed to high temperatures during the spraying process. This makes CGDS particularly advantageous for spraying materials such as titanium which react at high temperature. The aim of this project was to investigate the potential use of titanium coatings by CGDS as a surface treatment for medical prostheses. Titanium powder was deposited onto Ti6A14V substrate using helium ga

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45

Rymer, Dawn Lee. "The atmospheric chemical vapor deposition of titanium nitride on polyimide substrates." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1179952065.

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46

Nowotny, Maria Materials Science &amp Engineering Faculty of Science UNSW. "Defect disorder, semiconducting properties and chemical diffusion of titanium dioxide single crystal." Awarded by:University of New South Wales. School of Materials Science and Engineering, 2006. http://handle.unsw.edu.au/1959.4/27223.

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Semiconducting properties and related defect disorder for well defined TiO2 single crystal were studies. Semiconducting properties have been determined using simultaneous measurements of two independent electrical properties, including electrical conductivity, ??, and thermoelectric power, S, at elevated temperatures (1073-1323 K) in the gas phase of controlled oxygen activity (10-10 Pa &lt p(O2) &lt 75 kPa). Measurements of s and S were conducted (i) in the gas/solid equilibrium and (ii) during equilibration. Oxygen vacancies have been identified as the predominant defects in TiO2 over a wide

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47

Buchholz, Tuisko M. "Photocatalytic oxidation of glymes in an aqueous suspension of titanium dioxide." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83853.

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Lower members of the glyme family CH3-(-O-CH2-CH2-)n O-CH3 are refractory to the usual biological and physicochemical treatments, do not get retained on biofilters and are hardly sorbed to activated sludge or carbon. An alternate form of elimination is hence to be devised. TiO 2 particles have been utilized in the photocatalytic degradation of organic compounds often found in contaminated waste streams. When they are exposed to UV light, an electron is excited from the TiO2 valence band into the conduction band. The photogenerated electron vacancy ("hole") can initiate the oxidation of

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48

Te, Alino. "Improvement in Toughness of Castings through Chemical Surface Modification." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/1271.

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Alloys with good toughness and elevated temperature properties like A201 are expensive and can be more difficult to process. This results in the use of heavier but less expensive alternatives in many applications where toughness is of concern, such as steels. Common alloys such as A356 and E357 are relatively cheap and easy to work with. However, these alloys have considerably lower toughness than premium alloys. This research aims to investigate surface modification treatments that could yield better toughness at a low cost in a common aluminum alloy. The process must show significant improve

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49

Martin, Holly Joy. "The chemical and mechanical effects of binding chitosan to implant quality titanium." Diss., Mississippi State : Mississippi State University, 2006. http://library.msstate.edu/etd/show.asp?etd=etd-09112006-150127.

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50

巌, 偉琪. "Bonding of chemically treated titanium implants to bone." Kyoto University, 1997. http://hdl.handle.net/2433/202215.

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