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Cristaux liquides, empreinte pour la préparation de matériaux mésoporeux organisés : application à la synthèse d'oxyde de titane nanocristallin

Abstract : This work deals with the preparation of mesoporous materials from fluorinated liquid crystals via the LCT mechanism. Synthesis parameters have been optimized for the preparation of ordered mesoporous silica with the hexagonal H1 phase of water/C8F17C2H4(OCH2CH2)9OH system. Results show a correlation between pore diameters of materials and hydrophobic diameters measured in liquid crystals. According to the coprecipitation method, incorporation of TiO2 in a silica matrix, synthesized using micelles (via the cooperative templating mechanism CTM) or the hexagonal phase of C8F17C2H4(OCH2CH2)9OH/water system (via liquid crystal templating mechanism LCT). Both pathways lead to a loss of mesopore ordering and a decrease of the specific surface area when titania content increases. If materials are prepared via CTM mechanism TiO2 is present on the surface whereas TiO2 is in the bulk when LCT mechanism is used. Mesoporous thin films have been prepared via EISA method. Grazing incidence small angle X-Ray scattering and reflectivity analysis have been used to define the structure of films and the thickness of the different layers. Finally an original method has been developed for the preparation of ordered titania mesoporous materials. Precipitation of titania in the hybrid mesophase is activated by a NH3 treatment. The structure is preserved after calcination step which allow the formation of TiO2 anatase. Photocatalytic activity of these materials has been tested on the photodegradation of methylorange
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Kévin Zimny. Cristaux liquides, empreinte pour la préparation de matériaux mésoporeux organisés : application à la synthèse d'oxyde de titane nanocristallin. Autre. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10111⟩. ⟨tel-01746344⟩

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