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Influence d'un cisaillement oscillant sur la dynamique de vieillissement microscopique d'un verre colloidal

Abstract : This experimental work tries to better characterize the eects of shearing upon the aging of colloidal glasses at a microscopic level. The rearrangement dynamics of the system is studied via a multiple light scattering technique (MSDWS) especially developed in this thesis. We show that under high oscillatory shear the system is rejuvenated and that it starts aging when the shear is stopped. Hence, at a microscopic level, high shear is equivalent for theses systems to thermal quench for other glassy materials. Furthermore we show that a gentle oscillatory shear help the system to age. We coined this phenomena "overaging". Theses two antagonistic eects (rejuvenation and overaging) are also observed on glassy polymer submitted to temperature steps. We eventually give a unied description of theses eects for the dierent perturbation within the frame of the SGR model. It clearly shows that an external perturbation broadens the distribution of relaxation for these systems.
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Submitted on : Wednesday, September 15, 2010 - 1:06:16 PM
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Virgile Viasnoff. Influence d'un cisaillement oscillant sur la dynamique de vieillissement microscopique d'un verre colloidal. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨pastel-00000272⟩

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