From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear
Abstract
We investigate stresses and particle motion during the start up of flow in a colloidal dispersion close to arrest into a glassy state. A combination of molecular dynamics simulation, mode coupling theory and confocal microscopy experiment is used to investigate the origins of the widely observed stress overshoot and (previously not reported) super-diffusive motion in the transient dynamics. A link between the macro-rheological stress versus strain curves and the microscopic particle motion is established. Negative correlations in the transient auto-correlation function of the potential stresses are found responsible for both phenomena, and arise even for homogeneous flows and almost Gaussian particle displacements.
Keywords
Cite
@article{arxiv.0807.3925,
title = {From Equilibrium to Steady State: The Transient Dynamics of Colloidal Liquids under Shear},
author = {J. Zausch and J. Horbach and M Laurati and S. U. Egelhaaf and J. M. Brader and Th. Voigtmann and M. Fuchs},
journal= {arXiv preprint arXiv:0807.3925},
year = {2009}
}
Comments
24 pages, 14 figures, J. Phys.: Condens. Matter, in press