Séchage microfluidique de fluides complexes : champs de concentration, diffusion collective et mesure in situ de contraintes

Abstract : Drying complex fluids is an original technique to study their properties. Solvent extraction enables the continuous concentration of fluids from a dilute to a solid state. The use of the microfluidic scale allows one to limit side effects and simplify experiments, observations and modeling. This project mainly describes the drying of colloidal dispersions in two confined geometries: microfluidic channels and confined droplets between two plates. With these two techniques, we estimate collective diffusion for a water/glycerol mixture and a model dispersion of charged silica nanoparticles over the whole concentration range. Moreover, the drying of complex fluids often induces mechanical stresses which are the root for deformation, delamination phenomena and cracks. We developed an original technique to measure these stresses in situ. For a model colloidal dispersion, we evidenced experimentally that these forces arise from a liquid to solid state transition. The increase of these stresses is then associated with the drying of a poroelastic gel.
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Anne Bouchaudy. Séchage microfluidique de fluides complexes : champs de concentration, diffusion collective et mesure in situ de contraintes. Chimie-Physique [physics.chem-ph]. Université de Bordeaux, 2018. Français. ⟨NNT : 2018BORD0192⟩. ⟨tel-02145212v2⟩

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