Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-06-14
Physics
Condensed Matter
Soft Condensed Matter
5 pages, 5 figures
Scientific paper
10.1103/PhysRevE.71.011505
The influence of an applied shear field on the dynamics of an aging colloidal suspension has been investigated by the dynamic light scattering determination of the density autocorrelation function. Though a stationary state is never observed, the slow dynamics crosses between two different non-equilibrium regimes as soon as the structural relaxation time approaches the inverse shear rate. In the shear dominated regime (at high shear rate values) the structural relaxation time is found to be strongly sensitive to shear rate while aging proceeds at a very slow rate. The effect of shear on the detailed shape of the density autocorrelation function is quantitatively described assuming that the structural relaxation process arises from the heterogeneous superposition of many relaxing units each one independently coupled to shear with a parallel composition rule for timescales.
Di Leonardo Roberto
Ianni F.
Ruocco Giancarlo
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