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Simulation de la formation de films polymères par séchage de colloïdes aqueux

Abstract : Drying of colloidal dispersions, given their uses in several fields in everyday life, has been the subject of many studies for a long time. In this thesis, we first developed an unidirectional simulation, based on the principle of the cellular automaton, which deals with the problem of horizontal and vertical drying. This work makes it possible to predict, by numerical calculation, the distribution of the particles and the position of drying fronts in deposits in form of thin films.The profile of the film in the liquid part was studied. Our results have shown that the pressure in the fluid is the sum of the Laplace and hydrostatic pressures. This result affects the dynamics of particles in the fluid part of the dispersion, in particular convection. The collective diffusion of charged particles has also been studied. Contrary to what was predicted in previous theoretical models, we were able to show that the collective diffusion of the charged particles could be important even within the lubrication approximation. Finally, the 1D simulation was extended to 2D in order to understand the reason why two fronts in perpendicular directions (case of a rectangular geometry) advance at different speeds. A comparison between the experimental data for the drying of a silica dispersion and the numerical calculation shows good agreement.
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Mohammad Nassar. Simulation de la formation de films polymères par séchage de colloïdes aqueux. Chimie-Physique [physics.chem-ph]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAE005⟩. ⟨tel-01778046⟩

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