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Theses

Ingénierie de surface des matériaux en milieux fluides supercritiques

Abstract : Recent developments in Materials Science point out the interest of combining different materials in order to obtain specific properties. One way towards multifunctional materials deals with the surface modification of materials. Thus, the challenge is to adjust materials properties by a control of the surface structuration at the nanometer scale.The first part of this thesis is dedicated to a bibliographic study of the process allowing the surface modification. Conventional methods exhibit some disadvantages like the use of solvent that require several post-treatments (wet processes) or high temperature (dry processes). In this context, surface modification techniques in supercritical media are presented like interesting alternative to conventional methods. The continuation of this thesis presents the surface modification of silica spheres, used as model substrates, in supercritical media. The modification is realised first with copper nanoparticles of controlled size (5 – 17 nm) and morphology (spheres, cubes) with a tuneable amount of coverage (40 - 80 %); and then with a layer of polymer (PEG, PBHT) with a controlled thickness (2 – 30 nm) in the considered conditions. The modifications of the silica spheres are respectively based on the reduction of a metallic precursor in supercritical CO2 / Alcohol / H2 mixtures and on the variation of solubility of a polymer in a solvent / antisolvent mixture.
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Submitted on : Friday, February 16, 2007 - 12:14:21 PM
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  • HAL Id : tel-00131417, version 1

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Samuel Marre. Ingénierie de surface des matériaux en milieux fluides supercritiques. Matériaux. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00131417⟩

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