Coupling between aging and convective motion in a colloidal glass of Laponite

Abstract : We study thermal convection in a colloidal glass of Laponite in formation. Low concentration preparation are submitted to destabilizing vertical temperature gradient, and present a gradual transition from a turbulent convective state to a steady conductive state as their viscosity increases. The time spent under convection is found to depend strongly on sample concentration, decreasing exponentially with mass fraction of colloidal particles. Moreover, at fixed concentration, it also depends slightly on the pattern selected by the Rayleigh Bénard instability: more rolls maintain the convection state longer. This behavior can be interpreted with recent theoretical approaches of soft glassy material rheology.
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Submitted on : Monday, February 19, 2007 - 9:48:58 AM
Last modification on : Thursday, April 19, 2018 - 2:54:03 PM
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Ludovic Bellon, Mathieu Gibert, Rodrigo Hernández. Coupling between aging and convective motion in a colloidal glass of Laponite. European Physical Journal B: Condensed Matter and Complex Systems, Springer-Verlag, 2007, pp.101-107. ⟨10.1140/epjb/e2007-00049-y⟩. ⟨ensl-00121535v3⟩

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