S. Jabbari-Farouji, G. H. Wegdam, Daniel Bonn
We study the rotational diffusion of aging Laponite suspensions for a wide range of concentrations using depolarized dynamic light scattering. Measured orientational correlation functions undergo an ergodic to non-ergodic transition that is characterized by a concentration-dependent ergodicity-breaking time. We find that the relaxation times associated with rotational degree of freedom as a function of waiting time when scaled with the ergodicity-breaking time collapse on two distinct master curves. These master curves are in agreement with the ones that were previously found for the translational relaxation times and were affiliated to colloidal gels and glasses. Therefore, the aging dynamics of rotational dynamics provides another signature of distinct dynamical behavior of colloidal gels and glasses.
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http://arxiv.org/abs/1203.4999
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