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Shear-melting of a columnar crystal through proliferation of dislocations
Auteur(s): Ramos L.
(Affiches/Poster)
5rd Liquid Matter Conference (Konstanz, Germany, FR), 2002-09-14 |
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Ultraslow dynamics and stress relaxation in the aging of a soft glassy system 
Auteur(s): Ramos L., Cipelletti L.
(Article) Publié:
Physical Review Letters, vol. 87 p.245503 (2001)
Texte intégral en Openaccess : 
Ref HAL: hal-00122195_v1
Ref Arxiv: cond-mat/0109105
Ref. & Cit.: NASA ADS
Exporter : BibTex | endNote
Résumé: 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.
Commentaires: 8 pages, 4 figures
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