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Elaboration et caractérisation d'un vernis antireflet sol-gel innovant pour application dans les systèmes d'écrans embarqués en aéronautique

Abstract : Low refractive index hydrophobic antireflective coatings were synthetized as mesoporous nanometric thin silica films by use of sol gel chemistry coupled with the dip coating process on thermo sensitive polymeric substrates such as poly(methyl methacrylate) (PMMA) and cellulose triacetate (TAC). Thin films of pure and hybrid silica were stiffened by ammonia vapor treatment (AVT) at room temperature. Optical, mechanical and chemical stability of those coatings were optimized and the AVT-induced mechanisms of structuration depending on the chemical composition of silica films were proposed after the study of the influence of the ammonia treatment conditions and duration. Alcohol-assisted water vapor condensation and stabilization in hydrophobic mesoporous silica thin films were displayed at room temperature and atmospheric pressure. Study of the influence of surface chemistry and pore size, as well as partial vapor pressure of water and alcoholic co-adsorbant, and chemical nature of the alcohol allowed us to determine the mechanisms of water adsorption and confinement in hydrophobic nano-cavities. Water diffusion into millimetric scaled silica xerogel monoliths was reported using in situ environmental ellipsometry for the first time. Other subject as different as the production of graded functional films, fabrication of inorganic thin films based humidity sensitive actuators, synthesis of BaTiO3 mesostructured thin films and shaping of 3D quartz films are also discussed.
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  • HAL Id : tel-01165001, version 1

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Mickael Boudot. Elaboration et caractérisation d'un vernis antireflet sol-gel innovant pour application dans les systèmes d'écrans embarqués en aéronautique. Chimie-Physique [physics.chem-ph]. Université Pierre et Marie Curie - Paris VI, 2014. Français. ⟨NNT : 2014PA066387⟩. ⟨tel-01165001⟩

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