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Pré-Publication, Document De Travail Année : 2004

Intrinsic aging and effective viscosity in the slow dynamics of a soft glass with tunable elasticity

Laurence Ramos
Luca Cipelletti
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Résumé

We investigate by rheology and light scattering the influence of the elastic modulus, $G_0$, on the slow dynamics and the aging of a soft glass. We show that the slow dynamics and the aging can be entirely described by the evolution of an effective viscosity, $\eta_{eff}$, defined as the characteristic time measured in a stress relaxation experiment times $G_0$. At all time, $\eta_{eff}$ is found to be independent of $G_0$, of elastic perturbations, and of the rate at which the sample is quenched in the glassy phase. We propose a simple model that links $\eta_{eff}$ to the internal stress built up at the fluid-to-solid transition.
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Dates et versions

hal-00003209 , version 1 (03-11-2004)

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Laurence Ramos, Luca Cipelletti. Intrinsic aging and effective viscosity in the slow dynamics of a soft glass with tunable elasticity. 2004. ⟨hal-00003209⟩
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