Aging under Shear: Structural Relaxation of a Non-Newtonian Fluid
arXiv:cond-mat/0406321 · doi:10.1103/PhysRevE.71.011505
Abstract
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.
arXiv comment5 pages, 5 figures
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- Aging after shear rejuvenation in a soft glassy colloidal suspension: evidence for two different regimes
- Shear Mediated Elongational Flow and Yielding in Soft Glassy Materials
- Ageing under stress and mechanical fragility of soft solids of laponite
- Strain-Rate Frequency Superposition in Large-Amplitude Oscillatory Shear
- Time-aging time-stress superposition in soft glass under tensile deformation field
- Tailoring Relaxation Time Spectrum in Soft Glassy Materials
- Molecular mobility in driven monomeric and polymeric glasses
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- Modeling dependence of creep recovery behavior on relaxation time distribution of ageing colloidal suspensions
- Tensile Deformation and Failure of Thin Films of Aging Laponite Suspension