Ultraslow dynamics and stress relaxation in the aging of a soft glassy system
arXiv:cond-mat/0109105 · doi:10.1103/PhysRevLett.87.245503
Abstract
We use linear rheology and multispeckle dynamic light scattering (MDLS) to investigate the aging of a gel composed of multilamellar vesicles. Light scattering data indicate rearrangement of the gel through an unusual ultraslow ballistic motion. A dramatic slowdown of the dynamics with sample age is observed for both rheology and MDLS, the characteristic relaxation time scaling as . We find the same aging exponent for both techniques, suggesting that they probe similar physical processes, that is the relaxation of applied or internal stresses for rheology or MDLS, respectively. A simple phenomenological model is developed to account for the observed dynamics.
8 pages, 4 figures, Submitted to PRL
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