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Dumeignil, Franck Payen Edmond Grimblot Jean. "Catalyse et environnement". Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/177.
Pełny tekst źródłaSynthèse des travaux en français et curriculum vitae. Recueil de publications en anglais non reproduit dans la version électronique. N° d'ordre (Lille 1) : 501. Titre provenant de la page de titre du document numérisé. Bibliogr. 5 p. Liste des publications et des communications.
Mignotte, Carole Denise. "Environnement local de l'erbium dans des monocristaux de LiNbO3 implantés et des couches sol-gel de TiO2 et ZrO2 dopées". Lyon 1, 1998. http://www.theses.fr/1998LYO10069.
Pełny tekst źródłaArsac, Fabrice. "Dégradation photocatalytique de composés organiques volatils : étude de l'interface gaz-solide et de la phase gazeuse : application au traitement de l'air dans les environnements maîtrisés". Lyon 1, 2006. http://www.theses.fr/2006LYO10043.
Pełny tekst źródłaNguyen, Dinh An Christine. "Conception et réalisation d'un pilote pour le traitement photocatalytique d'effluents gazeux pollués en composés organiques volatils : application à l'élimination du méthanol dans l'air". Grenoble INPG, 2001. http://www.theses.fr/2001INPG0003.
Pełny tekst źródłaSchulz, Aurélie. "Analyse de l'impact du cycle de vie des NPs TiO2 manufacturées à l'échelle du site spécifiqe : cas de la vallée de la Thur, 68, France". Electronic Thesis or Diss., Strasbourg, 2020. http://www.theses.fr/2020STRAH022.
Pełny tekst źródłaThe impact of engineered TiO2 NPs was assessed using the Life cycle assessment methodology at a site-specific scale. A first approach was carried out to detect them in the environment. Experimental data collected in the field were used to characterize these nanoparticles for terrestrial ecotoxicity at a local scale. TiO2 NPs were detected in the water and sediments of the Thur river and in soils of the study area up to 2,5 km from a production site. The residence time (fate factor) of TiO2 NPs in area soils of Thann is approximately 8500 years. A specific effect factor (12,46 PAF.m3.kg-1) was also developed using date from a bibliographic synthesis on the toxicity of TiO2 NPs for organisms in terrestrial ecosystem. The determination of these two parameters allows us to calculate the first characterization factor for TiO2 NPs for terrestrial ecotoxicity in the Thann region (1,06.105 PAF.m3.an.kg-1)
Nguyen, Lucie. "Approche du frittage et du co-frittage de matériaux céramiques et métalliques pour l'élaboration par le procédé d'impression jet d'encre de composants magnétiques". Limoges, 2013. http://www.theses.fr/2013LIMO4005.
Pełny tekst źródłaThis work deals with the study of the sintering of ceramic and metallic materials to allow their co-sintering for the development of a magnetic component shaped by ink-jet printing. The study and understanding of the sintering of the dielectric material (composed of silica) with or without additives such as TiO2, Bi2O3, ZnO relied on the in situ characterizations by ESEM and XRD of the phase transformations, the mechanisms of densification occurring during the heat treatment. It has been shown that these additives could act either as former or modifier of the vitreous silica network and lead to large variations in the crystallization température and densification. The densification kinetics and shrinkage amplitude of the dielectric, conductive and magnetic materials are very different, several improvement possibilities were advocated for their co-sintering: doping of the conductive material, calcination température of the magnetic material. . . . These solutions allowed the élaboration of bimaterial components shaped by ink-jet printing with designs close to the one of the final component
Gustafsson, Jan. "The effect of pH and electrolyte concentration on the dispersion properties of titanium dioxide /". Åbo : Åbo akademi university, 2003. http://catalogue.bnf.fr/ark:/12148/cb401252046.
Pełny tekst źródłaLafont, Ugo. "Oxydes de titane mésoporeux : synthèse, caractérisation et modification de surface". Montpellier 2, 2003. http://www.theses.fr/2003MON20150.
Pełny tekst źródłaCAROFF, FLORENCE. "Preparation et etude de bio-ceramiques oxyde de titane - phosphate tricalcique". Paris 6, 1997. http://www.theses.fr/1997PA066630.
Pełny tekst źródłaJacota, Popescu Simona Andreia. "Films minces de dioxyde de titane déposés sur titane par mocvd : microstructure et biocomptabilité". Phd thesis, Toulouse, INPT, 2008. http://oatao.univ-toulouse.fr/7799/1/jacota_popescu.pdf.
Pełny tekst źródłaGimenez, Christian. "Etude par spectrométrie de masse d'ions secondaires de l'hydroxylation de tiO:(2) (100)". Dijon, 1985. http://www.theses.fr/1985DIJOS056.
Pełny tekst źródłaMetzger, Jean-Marc. "Etude des mécanismes d'interaction du dioxyde de titane avec la cellulose en milieu aqueux". Mulhouse, 1989. http://www.theses.fr/1989MULH0133.
Pełny tekst źródłaBessekhouad, Yassine. "Propriétés photocatalytiques de TiO2 nanocristallins dopés par des cations (Li+, Na+ et K+) et des hétérojonctions à base de sulfures et d'oxydes métalliques / TiO2". Metz, 2003. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2003/Bessekhouad.Yassine.SMZ0317.pdf.
Pełny tekst źródłaPonche, Arnaud. "Suspensions de particules dans des solutions de polymère : rhéométrie et observation microscopiques". Mulhouse, 2003. http://www.theses.fr/2003MULH0720.
Pełny tekst źródłaThis study deals with rheological properties of titanium dioxyde suspensions in polymer solutions. Rheological behaviour is strongly dépendent on particle-particle interactions and also on particle-polymer interactions in the continuons phase. These interactions really undergoes shape modification of aggregates. Consequently, we have developped tools to Observe titanium dioxyde aggregates under shear. The shape of aggregates is caracterised by a fractal dimension Df in two or three dimensions. This parameter can be correlated with the évolution of suspension viscosity. The last part of this work deals with flow instabilities obtained with glass beads dispersed in a solution of polyisobutylene. Saffman- Taylor instability appeared when cone and plate of the rheometer are removed from each other. In the case of titanium dioxyde suspensions, fractal shape can be observed and can be related to viscous fingering in hele-Shaw cells
Bessekhouad, Yassine Weber Jean-Victor Robert Didier. "Propriétés photocatalytiques de TiO2 nanocristallins dopés par des cations (Li+, Na+ et K+) et des hétérojonctions à base de sulfures et d'oxydes métalliques / TiO2". Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/2003/Bessekhouad.Yassine.SMZ0317.pdf.
Pełny tekst źródłaAlbaret, Tristan. "Etude theorique d'interface metal-oxyde et d'agregats d'oxyde de titane non-stoechiometriques". Paris 6, 2000. http://www.theses.fr/2000PA066546.
Pełny tekst źródłaHarzallah, Omar Anis. "Propriétés rhéologiques de suspensions d'oxyde de titane dans des solutions de polymères". Mulhouse, 1999. http://www.theses.fr/1999MULH0565.
Pełny tekst źródłaLiu, Chia-Erh. "Synthèse et caractérisation de nano-cristallites de TiO² à basse température : stabilisation de solutions colloïdales et dépôts par voie chimique". Nantes, 2008. http://www.theses.fr/2008NANT2049.
Pełny tekst źródłaGrandcolas, Mathieu. "Étude de matériaux et textiles à base de dioxyde de titane pour la dégradation photocatalytique d’agents chimiques". Strasbourg, 2009. http://www.theses.fr/2009STRA6257.
Pełny tekst źródłaWe report on the photocatalytic degradation of chemical warfare (CW) agents and simulants using different types of template-assisted TiO2 rutile-based nanomaterials and nanoscale tubular titanate-based structures. Decontamination of paints, fabrics or textiles contaminated by chemical warfare agents is of great importance for application in the civil, military as well as counterterrorism fields, and therefore the search for self-decontaminating paints and textiles if of high interest. DMMP (dimethylmethylphosphonate), DES (diethylsulfur), and yperite were used as chemical simulants and real chemical agents, respectively. Different methods for covering and anchoring photocatalytic nanomaterials on textiles or paints substrates were discussed and compared, such as spraying, dip-coating and the Layer-by-Layer method, from a material aspect with bulk and surface characterization techniques as well as from a kinetic and reactivity point of view. Efficient UVA- and solar light-activated chemical warfare degradation have been obtained on paints and textiles covered by photocatalytic nanoparticles. Results on chemical simulants and real chemical warfare agents are compared, and some kinetics of chemical degradation detailed, allowing paints and textiles to exhibit global self-decontaminating properties
Gourinchas, Courtecuisse Valérie. "Mise au point d'un procédé d'élaboration de poudres d'oxyde métallique en milieu supercritique dans un réacteur semi-continu". Paris 13, 1995. http://www.theses.fr/1995PA132031.
Pełny tekst źródłaVan, Thournout Michèle. "Relation structure - texture - propriétés électrochimiques des titanates de lithium type ramsdellite". Montpellier 2, 2006. http://www.theses.fr/2006MON20160.
Pełny tekst źródłaPeng, Chih Wei. "Synthèse, étude structurale et propriétés de nanomatériaux". Nantes, 2006. http://www.theses.fr/2006NANT2018.
Pełny tekst źródłaIn this work, we report results obtained on nanostructured titanium oxides presenting applications in environnment and in renewable energies due to excellent photo-electrochemical properties in this series of materials. A systematic study o fhe synthesis conditions and in particular their optimizations via "soft chemistry" methods, leads to titanium oxides and oxo-hydroxydeis with different sizes ans forms. These materials have been cahracterized at each sysnthesis step by several spectroscopic techniques including X-Rays, TEM, GTA, FTIR, etc;;; Theses materials present improved performances in energy storage and in photcatalysis
Temga, Temga. "Mouvement et piégeage des charges électriques dans un matériau non-conducteur anisotrope : Application au rutile (TiO2)". Ecully, Ecole centrale de Lyon, 2004. http://bibli.ec-lyon.fr/exl-doc/ttemga.pdf.
Pełny tekst źródłaNon-conductive materials and particularly solid insulators have a capacity to trap electric charges under certain conditions. The characterization of the trapping mechanisms achieved by the space charge physic, which describes not only trapping and conduction mechanisms of electric charges but also the condition of the stability and relaxation of the charges distribution. In this report, the trapping mechanisms of electric in a wide band gap semi-conductor material, are studied by the Scanning Electron Microscopy Mirror Effect. The studies have shown that electric charges diffuse, with a great leakage surface current. The high value and the anisotropy of the dielectric constant induces respectively a screening effect and an anisotropy of the distribution of trapped charges (elliptical or circular, mirors images). From the fundamental point of view, an appropiate analytical model is propose to take into account these new caracteristics
Zoulalian, Vincent. "Fonctionnalisation de surfaces d'oxyde de titane au moyen de polymères à base de phosphonates d'alkyles". Montpellier 2, 2008. http://www.theses.fr/2008MON20026.
Pełny tekst źródłaBen, Farah Moez. "Dosage de traces de chrome hexavalent par voie photoélectrochimique". Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL134N.
Pełny tekst źródłaHexavalent chromium is toxic even at a very low concentration. His detection require many processes of separation and preconcentration before analyzing the sample. This study describes the elaboration of a new method of Cr(VI) determination with a specific, selective and accurate detection and without manipulating the sample. The electrochemical probe is mabe by TiO2 single crystal n doped by partial reduction of rutile in hydrogen. The obtained semiconductor of the n doped rutile are deduced from impedance spectra of In-Ga/TiO2x/Au Schottky diode. This method has allowed us to suggest the reduction kenitic of rutile in hydrogen. After the activation in an electrolytic solution, the semiconductor is used as a photoelectrochemical sensor. The Cr(VI) concentration is measured in three steps : accumulation of the chromium at the surface of rutile at open circuit, voltametric sweeping with UV illumination of the electrode and surface regeneration. The detection is quantitative between 0. 005 and 2 ppm without any perturbation by other ions
Kubiak, Pierre. "Les oxydes de titane : matériaux d'électrodes négatives pour batteries Li-ion nouvelle génération". Montpellier 2, 2003. http://www.theses.fr/2003MON20141.
Pełny tekst źródłaIbrahim, Michael. "Polyaniline-Oxyde de Titane : un composite pour la récolte et le stockage d'énergie". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00740808.
Pełny tekst źródłaIbrahim, Michael. "Polyaniline-Oxyde de Titane : un composite pour la récolte et le stockage d’énergie". Thesis, Lyon 1, 2011. http://www.theses.fr/2011LYO10330/document.
Pełny tekst źródłaThis thesis is divided in three parts. The first one deals with the synthesis of polyaniline (PANI), a hole conducting polymer, used in many applications. By varying the quantities of the monomer and the oxidant while fixing the molar ratio at 1:1.25, and by adding magnesium oxide, novel echinoid-like and PANI needles were formed. The formation mechanism of the 1D structures is explained using the multi-layer theory. The second section is devoted for the fabrication of low cost single-layered photovoltaic devices based on the working principle of dye-sensitized solar cells (DSSCs). In 1991, Grätzel reintroduced the photo-electrochemical effect by developing the first DSSC, one of the third generation solar cells, formed of a TiO2 film (photoanode) sensitized using a dye and an electrolyte regenerating the excited dye. Despite their low cost, DSSCs face many problems such as the high cost of the dye, leaking of the electrolyte, sublimation of the I-/I3- through I2, etc. To solve these problems a single layer photovoltaic device has been developed. Composites formed of PANI, and TiO2 are the basis of the new generation photovoltaics. The in-situ polymerization of aniline inside a titania solution results in a strong interaction between PANI and TiO2 particles where a core (TiO2)/shell (PANI) structure exists inside the composite. In the single-layered photovoltaic device based on PANI-TiO2 composite, PANI is considered as sensitizer at the photoanode and as polyelectrolyte deeper inside the composite layer. In addition, textiles fabricated using such composites generated a voltage of 0.6 V and a current of 1 A/m2 when ethanol is injected in the solar cell. A new architecture has been developed to enhance the performance of the device and at the same time to store the converted energy for later use. The final part is devoted to the fabrication of DSSCs based on natural dyes. Anthocyanin; a halochromic natural dye responsible for the red color in plants, extracted from red cabbage was used to sensitize TiO2 films. This property results in the fabrication of DSSCs with different colors and photovoltaic behavior. At a pH equal to 0, a Voc and Jsc of 520 mV and 185 μA/cm2 were respectively recorded proving the possibility of using red cabbages as a very low cost dye source for DSSCs
Rouet, Annabelle. "De la polycondensation des oxydes de titane à la génération d'une photobatterie". Nantes, 2005. http://www.theses.fr/2005NANT2149.
Pełny tekst źródłaSince several decades, the chemistry of titanium and more particularly that of the dioxide (TiO2) is the subject of a great activity of research as well on the fundamental level as applied. It relates to fields going of the white pigment of paintings to the photocatalysis (air cleaning and water treatment) and to the photoelectrochemical activities (solar cells with dye). Among all technologies implying TiO2, the photoactivity constitutes, without any doubt, the most attractive property. In order to improve the photoactives properties, it is important to control the polycondensation of titanium oxides, which remains, at the present time, partially known. We, thus, showed that the hydrolysis of [Ti8O12(H2O)24]Cl8. HCl. 7H2O in aqueous medium allows to obtain various varieties of titanium oxides with particular morphologies. The hydrolysis of TiOCl2 has, as for it, allowed the synthesis of titanium sols and gels photosensitive promising for the realization of a photobattery
Jribi, Ramzi. "Mécanismes fondamentaux de l'hydrophilie photoinduite du dioxide de titane". Paris 6, 2009. http://www.theses.fr/2009PA066062.
Pełny tekst źródłaSarrat, Dominique. "Influence des anions sulfate sur la précipitation de l'oxyhydroxyde de titane". Mulhouse, 1989. http://www.theses.fr/1989MULH0108.
Pełny tekst źródłaBourdet, Perrine. "Elaboration et caractérisation de couches minces d'oxyde de titane". Aix-Marseille 1, 2006. http://www.theses.fr/2006AIX11052.
Pełny tekst źródłaKossi, Alaedine. "Consolidation de dispersions colloïdales d'oxyde de titane sous compression osmotique". Nice, 2012. http://www.theses.fr/2012NICE4115.
Pełny tekst źródłaPrélot, Bénédicte. "Mesure et modélisation de l'hétérogénéité énergétique à l'interface oxyde/électrolyte/métaux". Vandoeuvre-les-Nancy, INPL, 2001. http://docnum.univ-lorraine.fr/public/INPL_T_2001_PRELOT_B.pdf.
Pełny tekst źródłaOxides surfaces are energetically heterogeneous towards adsorption. At solid/gas interface, argon or nitrogen have already been used to evidence surface heterogeneity (morphology or reactivity). In this study, protons or hydroxyls are used as surface probes of topochemical and energetic heterogeneity at solid/liquid interface. The goal was to work with raw experimental data since smoothing procedures may smear out valuable information on local heterogeneity. Highresolution potentiometric titration (up to 50 data points per pH unit) are treated as accurate H+ or OH- adsorption isotherms. The derivative form of isotherms is recomposed by using local adsorption isotherms (TitriDIS procedure (Titration Derivative Isotherm Summation)) to identify various energetic domains and also affinity distributions. Local isotherms are basically derived from 1-pK charging equation, which can be written as a Langmuir-Ternkin isotherm. Bach domain is described by a specifie local dissociation/complexation equilibrium, characterized by one pK, a pK distribution and/or an effect of surrounding sites. Energetic domains show various reactivity of various surface sites and evidence the proton affinity distribution of the surface. In this work, three synthetic ( oxy-hydr)oxides, among the most studied in literature, were used: anatase, goethite and amorphous silica. Electrophoretic mobility, adsorption edges and surface charge have been measured, without or with metallic cations (Cu2+, Cd2+ and Pb2+). A set of different pKs (which represents the affinity for the cation) was determined for the three samples (quasicontinuous distribution for silica, 2 main domains for anatase, and 4 kinds of reactives sites for goethite ). The energetic distributions reveal the various effects of crystallographic faces, defects, impurities, or dissolution. Such an analytical procedure represent an exciting tool to map (nature, localization and density) smface active sites of importance in interfacial phenomena
Vu, Thi Thuy Duong. "TiO₂ and its derivatives : synthesis, characterization and application in H₂ production via water splitting and in bulk heterojunction solar cells". Doctoral thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/25661.
Pełny tekst źródłaIn a context of environmental crisis and depletion of conventional energy resources, the current energy model based on fossil fuels is obsolete and needs to be redefined and redesigned. Even though, there are many different renewable alternatives developed or under developing, which are expected to take a main role in the middle and long term. The use of energy from the sun is currently attracting much attention from the scientists. For example, hydrogen generation via water splitting and photovoltaic devices that convert directly sunlight into electricity become more competitive as the cost continues to decrease with the technology advancement. Taking this into account, this thesis is focused on the synthesis and modification of titanium dioxide nanoparticles (TiO2 NPs) and the development and optimization of devices based on these nanoparticles for photovoltaic applications and photocatalyst water splitting. The synthesis of TiO2 NPs was mainly emphasized on controlling the morphologies, especially their shape and size, by using different types of capping agents. TiO2 NPs with various shapes, such as nanosphere, nanorod, nanorhombic, and various sizes from 3 x 40 nm to 3 x 20 nm were achieved. The effects of capping agent on TiO2 NPs morphologies were characterized and analyzed carefully. Based on the developed TiO2 NPs, cadmium sulfide (CdS) was deposited on the surface of TiO2 NPs, and then was optimized for the hybrid bulk heterojunction solar cells (BHJs) and photocatalytic hydrogen production via water splitting. Especially, with the use of TiO2-based nanocomposites in BHJs systems, it showed improvement of around 17 times in power efficiency conversion compared to the system used unmodified TiO2 NPs. On the other hands, with the use of a new non-noble metal-nanocomposites composed of CdS/TiO2, and Nikel clusters, the performance of the photocatalytic hydrogen production via water splitting system was enhanced and it showed that the reaction is stable up to 15h.
Salou, Samantha Eva. "Détection et quantification de nanoparticules de dioxyde de titane dans les fluides biologiques par Simple Particule ICP-MS". Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/68758.
Pełny tekst źródłaThe use of nanoparticles has revolutionized many industrial sectors, including cosmetics, food and even pharmaceuticals. Their omnipresence in consumer products is raising major concerns about users’ health. Titanium dioxide is widely used as a food additive, whitening agent or UV filter. Its extensive use exposes humans to potential risk of toxicity. Many epidemiological studies on animals have highlighted the harmful effects of chronic exposure on various organs, sometimes leading to numerous diseases. In the case of the analysis of biological fluids, the existing methods of quantification are not suitable. Blood and urine being complex matrices, commonly used analytical tools suffer from a lack of sensitivity, specificity and selectivity. In order to overcome these limitations, it is essential to develop faster, simpler, more precise and robust methods based on innovative approaches to be able to detect and quantify titanium dioxide nanoparticles in these biological matrices. This project is part of a global vision to understand and assess human exposure to titanium dioxide nanoparticles. The aim of this thesis is to develop unique innovative methods that can be employed on a routine basis to detect and quantify those nanoparticles in various biological fluids such as urine and blood. Particular attention should be paid to the sample preparation, as most analytical techniques require particle suspension. Titanium dioxide having a strong tendency to agglomerate or aggregate, an approach to stabilize suspensions had to be optimized to ensure reliable size and concentration determination. Analytical methods were developed using an innovative technique, Simple Particle-ICP-MS, dedicated to monitoring individual nanoparticles. This specialized technique is a fast, robust, sensitive metrological tool requiring limited sample preparation. Urine and blood samples are spiked with titanium dioxide nanoparticles to optimize the detection parameters. To ensure the reliability of those methods and use them in a routine mode, validation according the ISO/CEI 17025:2017 guidelines is essential. Thus, this thesis presents a complete methodology for the analysis of titanium dioxide nanoparticles in urine and blood samples. To guide the reader, a theoretical part dealing with the physico-chemical properties of the element of interest will be provided. In addition, overall strategies on their quantification will also be detailed in order to demonstrate the novelty of this work.
Rachimoellah, Muhammad. "Photo-oxydation de l'acide formique par l’oxygène en présence de dioxyde de titane et d'ions cuivre dissous en solution aqueuse". Lyon, INSA, 1988. http://www.theses.fr/1988ISAL0029.
Pełny tekst źródłaSutrisno, Hari. "Synthèse et caractérisation d'oxyde de titane (TiO2) micro-mésostructuré à dimensionnalité contrôlée (0D, 1D, 2D et 3D)". Nantes, 2001. http://www.theses.fr/2001NANT2098.
Pełny tekst źródłaKameneva, Olga. "Matériaux hybrides organiques-inorganiques photochromes". Paris 13, 2009. http://www.theses.fr/2009PA132028.
Pełny tekst źródłaBranland, Nadège. "Projection par plasma de dépôts de dioxyde de titane : contribution à l'étude de leurs microstructures et propriétés électriques". Sherbrooke : Université de Sherbrooke, 2002.
Znajdź pełny tekst źródłaAubry, Éric Billard Alain. "Étude des relations entre les propriétés physicochimiques et photocatalytiques de revêtements nanostructurés de dioxyde de titane synthétisés par pulvérisation cathodique magnétron en condition réactive". S. l. : INPL, 2007.
Znajdź pełny tekst źródłaCottineau, Thomas. "Sols et gels photosensibles à base d'oxyde de titane pour applications photovoltaïques". Nantes, 2007. http://www.theses.fr/2007NANT2081.
Pełny tekst źródłaBeside to their white pigment properties, known for several years, new applications of the titanium oxides induces a lot of new scientific works during the past decade. All these new applications, like photodepollution of water through photocatalysis, air cleaning, dye sensitized solar cells (DSSC), self cleaning surfaces… are based on the photoactive properties of this material. The previous studies done at the Institut des Materiaux Jean Rouxel, lead to the synthesis of various forms of titanium oxide that can be used for this different applications. During this study, we focus on new hybrid sols and gels, having original photosensitive properties. The formation mechanisms of these sols and gels have been studied. The Raman and 1H and 13C NMR spectroscopies have shown that the organic solvent is directly involved in the condensation mechanism. In particular the hydrolysis of the organic solvent produces dimethylammonium chloride and methanoic acid, both strongly interacting with the inorganic nanostructured framework. The extension of the latter controls the sol-gel transformation and was characterised by X-ray absorption spectroscopy (XANES and EXAFS). The photochromic properties were investigated by UV-visible spectroscopy. Using the magnetic results and XPS studies, we proposed a reaction mechanism, involving the reduction of Ti(IV) to Ti(III), for the blue coloration appearing under UV irradiation. The importance of the organic part from the solvent in this mechanism has also been pointed out. A photovoltaic cell, based on the principle of DSSC, has been developed to evaluate the possibilities of the gel for solar energy conversion applications. The photo-electrochemical experiments done on the photoactive electrode show a chemical storage of the charges formed under irradiation. This property enables the development of a device that could convert and store solar energy : a rechargeable photobattery
Rivallin, Matthieu. "Evolution de sols nanométriques d'oxyde de titane durant l'induction d'une précipitation de type sol-gel en réacteur à mélangeur rapide : Mesures granulométriques in-situ et modélisation". Paris, ENMP, 2003. http://www.theses.fr/2003ENMP1159.
Pełny tekst źródłaThe titanium oxide synthesis by sol-gel process consists, here, to carry out the hydrolysis and the condensation of the titanium tétraisopropoxyde. The elementary chemical steps are well known, but kinetics, essential tools for the scale-up at the industrial dimension, are still badly understood. The study of the induction time of this precipitation thus carried out in order to pass from the laboratory synthesis to the process. A new sol-gel reactor was thus developed in order to answer following waitings: control mixing and micromixing of the reagents by their injection in few seconds through a static T mixer, temperature and atmosphere inside the reactor and possibility to maintain the mixing in the reactor by mechanical agitation. A probe for in-situ measurement of sols evolution was carried out. Its principle is based on the light scattering by the suspension and on the use of optical fibres. It can be used in a non-transparent reactor, under moderate agitation and makes it possible to move back the limits imposed by the multiple diffusion. This system reactor+measurement probe provided controllable and reproducible kinetic results, in particular for induction times and for the evolution of the sols mean radius. Data obtained were used as a basis for a kinetic model of sols aggregation with polymeric structure of fractal dimension close to 1, controlled by hydrolysis and condensation reactions between nuclei initially produced. It makes it possible to predict the suspension evolution and thus to control the titanium oxide synthesis via sol-gel route
Baillon, Fabien. "Procédé de synthèse du dioxyde de titane : analyse et modélisation des solutions titane-sulfate; influence des ultrasons sur la précipitation". Paris, ENMP, 2002. http://www.theses.fr/2002ENMP1046.
Pełny tekst źródłaSenouci, Abdelhamid. "Structures, propriétés spectroscopiques et électroniques d'oxo-alcoxycarboxylates de titane (IV)". Université Louis Pasteur (Strasbourg) (1971-2008), 2007. https://publication-theses.unistra.fr/public/theses_doctorat/2007/SENOUCI_Abdelhamid_2007.pdf.
Pełny tekst źródłaSenouci, Abdelhamid Henry Marc. "Structures, propriétés spectroscopiques et électroniques d'oxo-alcoxycarboxylates de titane (IV)". Strasbourg : Université Louis Pasteur, 2007. http://eprints-scd-ulp.u-strasbg.fr:8080/834/01/SENOUCI-Abdelhamid_2007.pdf.
Pełny tekst źródłaDiop, Amadou Lamine. "NANOCOMPOSITES POLY(DIMETHYLSILOXANE) - SILICE OU OXYDE DE TITANE GENERE IN SITU : SYNTHESE, STRUCTURE ET PROPRIETES". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://pastel.archives-ouvertes.fr/pastel-00578502.
Pełny tekst źródłaDiop, Amadou Lamine. "Nanocomposites Poly(diméthylsiloxane)-silice ou oxyde de titane généré in situ : synthèse, structure et propriétés". Paris 6, 2010. http://www.theses.fr/2010PA066028.
Pełny tekst źródłaKuznetsov, Arseniy. "Etude de l'interaction laser-gels et matériaux hybrides (organique-inorganique) à base d'oxyde de titane". Paris 13, 2005. http://www.theses.fr/2005PA132044.
Pełny tekst źródłaThis PhD work is devoted to study of light interaction with a new class of media – wet titanium oxide gels and gel-based hybrid materials. The separation of light-induced charges (e– and h+) with high quantum efficiency is demonstrated in these materials: the electrons are stored in gel network as Ti3+, whereas the holes are stored in liquid component of the gels and in polymer component of the hybrids. Their lifetime can be as long as several months. All light-induced Ti3+ are chemically active. They are responsible for dark absorption continuum from 350 nm to 2. 5 µm. A theoretical model is proposed explaining the main features of the laser-induced charge kinetics. The gel darkening induced by millijoule femtosecond laser pulses is shown. It occurs in the beam filamentation conditions and reveals nonlinear mechanisms related to soft plasma. This study shows high photosensitivity of titanium oxide gels and gel-based hybrid materials allowing to consider them for photonic applications
Papazia, Mariam Eugénie. "Comportement de molécules biocides thiocyanées dans l'environnement : étude de leur dégradation : décomposition du sulfure de diméthyle, modèle de molécule soufrée, légère, malodorante : interactions de surface DMS-TiO2". Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10172.
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