Partial rejuvenation of a colloidal glass

Details Partial rejuvenation of a colloidal glass Partial rejuvenation of a colloidal glass

2002-10-24

arxiv.org/abs/cond-mat/0210554v2

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures, to appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.68.032401

We study the effect of shear on the aging dynamics of a colloidal suspension of synthetic clay particles. We find that a shear of amplitude $\gamma$ reduces the relaxation time measured just after the cessation of shear by a factor $\exp(-\gamma/\gamma_c)$, with $\gamma_c \sim 5%$, and is independent of the duration and the frequency of the shear. This simple law for the rejuvenation effect shows that the energy involved in colloidal rearrangements is proportional to the shear amplitude, $\gamma$, rather than $\gamma^2$, leading to an Eyring-like description of the dynamics of our system.

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