Aging dynamics in a colloidal glass of Laponite

Details Aging dynamics in a colloidal glass of Laponite Aging dynamics in a colloidal glass of Laponite

2001-01-21

arxiv.org/abs/cond-mat/0101327v1

Phys. Rev. E, 64 2001 021510

Physics

Condensed Matter

Soft Condensed Matter

9 pages, 8 Postscript figures, submitted to Phys. Rev. E

Scientific paper

10.1103/PhysRevE.64.021510

The aging dynamics of colloidal suspensions of Laponite, a synthetic clay, is investigated using dynamic light stattering (DLS) and viscometry after a quench into the glassy phase. DLS allows to follow the diffusion of Laponite particles and reveals that there are two modes of relaxation. The fast mode corresponds to a rapid diffusion of particles within "cages" formed by the neighboring particles. The slow mode corresponds to escape from the cages: its average relaxation time increases exponentially fast with the age of the glass. In addition, the slow mode has a broad distribution of relaxation times, its distribution becoming larger as the system ages. Measuring the concomitant increase of viscosity as the system ages, we can relate the slowing down of the particle dynamics to the viscosity.

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