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Microrhéologie de suspensions colloïdales non ergodiques : Relaxations locales, dynamiques lentes et vieillissement

Abstract : Concentrated suspensions and soft colloidal glasses are interestingly broad class of materials in physics perspective but also in applications. These materials display both solid-like and liquid-like properties, slip phenomena or slow dynamic and ageing. Bulk rheology does not give access to a microscopic view of these phenomena and it is necessary to associate other techniques to monitor local structure and local dynamics. In this thesis we developed and used new tools like diffusive wave spectroscopy (DWS) or fluorescence microscopy. We studied the dynamics of concentrated suspensions near equilibrium, during ageing process or during flow. The main results are focused on linear viscoelasticity in a large frequency range from Brownian time scale to a few hours, on ageing phenomena and on the role played by surfaces on the flow profile.
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Submitted on : Thursday, January 27, 2011 - 10:04:06 AM
Last modification on : Wednesday, October 14, 2020 - 3:43:21 AM
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Fabrice Monti. Microrhéologie de suspensions colloïdales non ergodiques : Relaxations locales, dynamiques lentes et vieillissement. Matériaux. Paris 6, 2010. Français. ⟨pastel-00560061⟩

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