Dynamics of Internal Stresses and Scaling of Strain Recovery in an Aging Colloidal Gel

Details Dynamics of Internal Stresses and Scaling of Strain Recovery in an Aging Colloidal Gel Dynamics of Internal Stresses and Scaling of Strain Recovery in an Aging Colloidal Gel

2009-06-15

arxiv.org/abs/0906.2823v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

We monitor the relaxation of internal stresses in a fractal colloidal gel on cessation of flow and find a weak power law decay, $\sigma_i \sim t^{-\alpha}$ over 5 decades of time where $\alpha \approx 0.07$. The system exhibits physical aging of the elastic modulus, $G' \sim t^{\beta}$, with $\beta \approx \alpha$. Imposition of zero stress after waiting time $t_w$ results in strain recovery as the system relaxes without constraint. Remarkably, recoveries at different $t_w$ can be shifted to construct a master curve where data are scaled vertically by $1/\sigma_i(t_w)$ and plotted horizontally as $(t-t_w)/t_w^{\mu}$ where $\mu\approx 1.25$, indicative of a super-aging response.

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