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Structure and dynamics of fluids in quenched-random potential energy landscapes

Abstract : Recent experimental studies of the dynamics of colloids beamed by a random light pattern (speckle) showed the existence of subdiffusion, trapping, or mixture separation phenomena, under the action of that disordered environment.To this end, a version of the Mode Coupling Theory (MCT), initially developed for fluids in confinement in sol id porous matrices has been applied to the case of a fluid plunged in a random Gaussian potential with a Gaussian correlation function.The aim of this PhD work is to further improve the understanding of these phenomena by the addition of a theoretical study.The numerical resolution of the asymptotic equations of this theory leads to the construction o phase diagrams, which reproduce for example the non trivial reentrent behaviour of the diffusivity, observed in related experiments, for which a physical interpretation is proposed. Furthermore, results suggest a strong depend ence of the dynamics on the disorder correlation length. A detailed study of the relaxation of the fluid has been made, in order to bring an understandin( of the dynamics at ali timescales. Simultaneously, it has been showed that a number of common approximations used in the calculation of the structural properties of fluids lead in the present case to non-physical results. Finally, a Monte-Carlo simulation program has been developed, and the first results are compared to theory and experiments.
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Submitted on : Tuesday, December 12, 2017 - 1:55:27 AM
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Thomas Konincks. Structure and dynamics of fluids in quenched-random potential energy landscapes. Mechanics of the fluids [physics.class-ph]. Université de Lyon, 2017. English. ⟨NNT : 2017LYSEN076⟩. ⟨tel-01661598⟩

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