期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 28, 期 24, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/28/24/244022
关键词
density functional theory; Q-tensor; rod-like colloids; binary mixture; shear-induced dynamics
资金
- Deutsche Forschungsgemeinschaft (DFG) [1558]
This paper is concerned with the dynamics of a binary mixture of rod-like, repulsive colloidal particles driven out of equilibrium by means of a steady shear flow (Couette geometry). To this end we first derive, starting from a microscopic density functional in Parsons-Lee approximation, a mesoscopic free energy functional whose main variables are the orientational order parameter tensors. Based on this mesoscopic functional we then explore the stability of isotropic and nematic equilibrium phases in terms of composition and rod lengths. Second, by combining the equilibrium theory with the Doi-Hess approach for the order parameter dynamics under shear, we investigate the orientational dynamics of binary mixtures for a range of shear rates and coupling parameters. We find a variety of dynamical states, including synchronized oscillatory states of the two components, but also symmetry breaking behavior where the components display different in-plane oscillatory states.
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