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28 March 2024
 
  » arxiv » cond-mat/0109105

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Ultraslow dynamics and stress relaxation in the aging of a soft glassy system
Laurence Ramos ; Luca Cipelletti ;
Date 6 Sep 2001
Journal Phys. Rev. Lett. 87, 245503 (2001)
Subject Soft Condensed Matter | cond-mat.soft
AbstractWe 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.
Source arXiv, cond-mat/0109105
Other source [GID 959699] pmid11736514
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