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Etude des mécanismes de coloration de verres obtenue par échange ionique Ag+/Na+ et précipitation de nano agrégats métalliques

Abstract : The main purpose is to study by the method of silver ionic exchange of silicate glasses the induced coloring and the realization of planar waveguides.Two methods of modelization of Ionic exchange are presented to estimate the exchange parameters which are diffusion coefficient, profile’s shape and ions mobility. This purely thermal method allows the realization of graded index waveguide, the addition of an electric field allows to obtain a step index profile. Various glass compositions are studied with the aim of determining the index variation induced by a polarizability of silver ions stronger than those of sodium/lithium ions initially contained in glasses. Following the Ionic exchange, an annealing can be made with the aim of precipitating silver in metallic nanoparticles which possess interesting properties of absorption allowing to color glasses : the Surface Plasmon Resonance (SPR). The nanoparticles formation mechanism depends on temperature and on redox effect of the medium. The irradiation made with a pulsed laser in nanosecond regime of exchanged glasses allows the local formation of silver nanoaggregates onto the glass surface. The pulsed irradiation in femtosecond regime allows an interaction into the glass volume, either with already present nanoparticles with the aim of modifying the color locally, or with exchanged glasses in which the defects are generated to favor then the formation of nanoparticles by annealing. The modelization of Surface Plasmon Resonance allows the evaluation of the nanoparticles growth mechanism in glasses. The used methods of characterization are Scanning Electron microscopy, Transmission Electron Microscopy, UV/Visible Spectroscopy, Photoluminescence and Fourier Transform Infrared Spectroscopy.
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Submitted on : Friday, August 26, 2011 - 12:27:40 PM
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Olivier Veron. Etude des mécanismes de coloration de verres obtenue par échange ionique Ag+/Na+ et précipitation de nano agrégats métalliques. Autre. Université d'Orléans, 2010. Français. ⟨NNT : 2010ORLE2070⟩. ⟨tel-00617160⟩



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