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Synthèse et valorisation de particules colloïdales de morphologie et de fonctionnalité de surface contrôlées

Abstract : The synthesis of colloids, whose properties can be adjusted by modifying the space arrangement of their components, should allow the conception of unique and revolutionary materials. This manuscript deals with the elaboration of hybrid particles constituted by a silica core, surface decorated by polystyrene latexes generated in situ through an emulsion polymerization process. It was demonstrated that the number and the size of the growing organic nodules could be controlled via the adjustment of the physicochemical surface characteristics of the silica seeds and/or the polymerization parameters. The resulting biphasic colloids were original from the point of view of their shape (regular polyhedral) and their size (a few hundred of nanometers).
Dissymmetrical nanoparticles, named "Janus" particles in reference to the Roman God, were also successfully synthesized according to two strategies. The first one was based on the partial masking of one of the seed hemispheres by one polystyrene latex, followed by a regioselective surface modification. The second one took advantage from the silica particle ability to stabilize a liquid/liquid interface (Pickering emulsions) in order to modify regioselectively the surface in contact with one or the other liquid phase.
The study of the properties of these colloids was also carried out for various potential applications, such as the preparation of colloidal crystals or complex multifunctional nanostructures.
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Adeline Perro. Synthèse et valorisation de particules colloïdales de morphologie et de fonctionnalité de surface contrôlées. Matériaux. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00136549⟩

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