Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-07-24
Physics
Condensed Matter
Soft Condensed Matter
7 pages, 6 figures
Scientific paper
10.1103/PhysRevE.75.011408
The aging dynamics after shear rejuvenation in a glassy, charged clay suspension have been investigated through dynamic light scattering (DLS). Two different aging regimes are observed: one is attained if the sample is rejuvenated before its gelation and one after the rejuvenation of the gelled sample. In the first regime, the application of shear fully rejuvenates the sample, as the system dynamics soon after shear cessation follow the same aging evolution characteristic of normal aging. In the second regime, aging proceeds very fast after shear rejuvenation, and classical DLS cannot be used. An original protocol to measure an ensemble averaged intensity correlation function is proposed and its consistency with classical DLS is verified. The fast aging dynamics of rejuvenated gelled samples exhibit a power law dependence of the slow relaxation time on the waiting time.
Di Leonardo Roberto
Gentilini Silvia
Ianni F.
Ruocco Giancarlo
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