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

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

2006-12-21

arxiv.org/abs/cond-mat/0612553v3

Eur. Phys. J. B 55, 101-107 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Eur. Phys. J. B 55, 101-107 (2007) The original publication is available at http://www.springerlink.com

Scientific paper

10.1140/epjb/e2007-00049-y

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 B\'{e}nard 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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