Evolution of particle-scale dynamics in an aging clay suspension

Details Evolution of particle-scale dynamics in an aging clay suspension Evolution of particle-scale dynamics in an aging clay suspension

2004-10-15

arxiv.org/abs/cond-mat/0410376v1

Phys Rev Lett 93, 228302, (2004)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, includes 4 postscript figures; accepted for publication in Phys Rev Lett

Scientific paper

10.1103/PhysRevLett.93.228302

Multispeckle x-ray photon correlation spectroscopy was employed to characterize the slow dynamics of a colloidal suspension formed by highly-charged, nanometer-sized disks. At scattering wave vectors $q$ corresponding to interparticle length scales, the dynamic structure factor follows a form $f(q,t) \sim \exp[-(t/\tau)^{\beta}$], where $\beta \approx$ 1.5. The characteristic relaxation time $\tau$ increases with the sample age $t_a$ approximately as $\tau \sim t_a^{1.8}$ and decreases with $q$ approximately as $\tau \sim q^{-1}$. Such a compressed exponential decay with relaxation time that varies inversely with $q$ is consistent with recent models that describe the dynamics in disordered elastic media in terms of strain from random, local structural rearrangements. The amplitude of the measured decay in $f(q,t)$ varies with $q$ in a manner that implies caged particle motion at short times. The decrease in the range of this motion and an increase in suspension conductivity with increasing $t_a$ indicate a growth in the interparticle repulsion as the mechanism for internal stress development implied by the models.

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