Ultraslow dynamics and stress relaxation in the aging of a soft glassy system

Details Ultraslow dynamics and stress relaxation in the aging of a soft glassy system Ultraslow dynamics and stress relaxation in the aging of a soft glassy system

2001-09-06

arxiv.org/abs/cond-mat/0109105v1

Phys. Rev. Lett. 87, 245503 (2001)

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 4 figures, Submitted to PRL

Scientific paper

10.1103/PhysRevLett.87.245503

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 $t_{w}$ is observed for both rheology and MDLS, the characteristic relaxation time scaling as $t_{w}^{\mu}$. We find the same aging exponent $\mu =0.78$ 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.

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