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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 | 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 $t_{w}$ 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 | Services: | Forum | Review | PDF | Favorites |
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