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Synthèse de matériaux d'architecture contrôlée à base de silice colloïdale

Abstract : This manuscript describes the use of colloidal silica particles with definite size and functionality to elaborate materials with specific properties. First, we compared several ways of elaborating silica particles from a molecular precursor following a classical sol-gel process. We managed to get spherical particles with a tuneable surface function and a regular mean size between 50 nm and 2 microns. Then, the behaviour of these particles at an air-water interface was studied by the Langmuir method. Colloidal crystals with a controlled thickness were then synthesized by transferring sequentially monolayers of particles onto hydrophilic substrates using the Langmuir-Blodgett technique. Such a control allowed us to study the influence of the crystals thickness on their spectroscopic properties. Another purpose of this study was dealing with the synthesis of particles with original morphologies in general and dissymmetrical particles in particular. To achieve this goal, techniques involving interfacial phenomena were first involved (plane and curved interfaces at the macroscopic scale). We also synthesized organic-inorganic particles through an emulsion polymerisation process seeded by surface-modified silica particles. While varying several experimental parameters, we managed to get hybrid particles with original and various but predictable morphologies, them being dissymmetrical (“dumbbell-like”, “snowman-like”, “decentred core-shell”) or not (“daisy-like”, “multipod-like” or “raspberry-like”). These new types of colloidal particles could present interesting properties in various fields of applied science like catalysis, electronic displays or stabilisation of complex media.
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https://tel.archives-ouvertes.fr/tel-00009245
Contributor : Nadine Laffargue <>
Submitted on : Thursday, May 12, 2005 - 2:41:52 PM
Last modification on : Thursday, January 11, 2018 - 6:14:59 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:17:24 PM

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  • HAL Id : tel-00009245, version 1

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Stéphane Reculusa. Synthèse de matériaux d'architecture contrôlée à base de silice colloïdale. Matériaux. Université Sciences et Technologies - Bordeaux I, 2004. Français. ⟨tel-00009245⟩

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