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BP: Fachverband Biologische Physik

BP 60: Pattern Formation (Joint Session with DY)

BP 60.2: Talk

Thursday, March 10, 2016, 10:00–10:15, H46

Shear driven instabilities in hard–core anisotropic colloids: Pressure tensor dynamics — •Henning Reinken, Rodrigo Lugo-Frias, and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

Systems of hard anisotropic particles display interesting flow induced behavior that modifies their internal structure and rheological properties [1, 2]. In soft matter theory, using the well known Doi–Hess approach, these systems have been studied in the bulk [3] and close to the boundaries [4].
Within this framework, we study how the pressure tensor is influenced by the average orientation of the particles coupled to the velocity field. To do so, we start from an isotropic or nematic equilibrium configuration and apply simple shear flow (Couette geometry) observing the emergence of instabilities (shear banding) in both scenarios. A novel finding is the appearance of coexisting stationary and oscillatory dynamics within the bands. We also discuss the resulting stress-strain relations.
[1] S. M. Fielding, Soft Matter, 3, 1262-1279 (2007).
[2] J. K. G. Dhont, M. P. Lettinga, et al., Faraday Discuss, 123, 157-172 (2003).
[3] D. Strehober, H. Engel and S. H. L. Klapp, Phys. Rev. E 88, 012505 (2013).
[4] S. Heidenreich, P. Ilg, and S. Hess, Phys. Rev. E 75, 066302 (2007).