Rhéo-optique. Transport incohérent de la lumière dans les milieux aléatoires ; application à la caractérisation dynamique d'émulsions concentrées

Abstract : In this thesis, we are interessed in the general problem of caracterizing concentrated evolving dispersions. A measurement technique that combines light diffusion and rheology is presented and validated. The spatial decrease of the measured light intensity allows the determination of the transport length of the sample, no preliminary calibration being required. This technique, validated by Monte-Carlo simulations and experiments, apply to media that sufficiently diffuse light. Two applications to size measurement of concentrated media are presented. In the first application, we follow the mechanism of emulsification in a dynamic manner. We underline the transfer of mechanical energy when drops break up. The second application follows simultaneously the coalescence mechanism and the mechanical properties of gel-emulsions. Our understanding of these two mechanisms has been improved thanks to the elaborated technique.
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Julien Mougel. Rhéo-optique. Transport incohérent de la lumière dans les milieux aléatoires ; application à la caractérisation dynamique d'émulsions concentrées. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10008⟩. ⟨tel-01754325⟩

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