Dresden 2014 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 18: Complex Fluids and Soft Matter (joint DY/CPP/BP)

BP 18.2: Vortrag

Dienstag, 1. April 2014, 09:45–10:00, ZEU 118

Shear driven instabilities in anisotropic colloidal mixtures — •Rodrigo Lugo-Frias and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany

In recent years much attention has been paid in understanding the orientational order of anisotropic hard bodies in the presence of steady shear flow [1,2]. On the other hand, sheared systems of binary mixtures of hard disc and rodlike particles have also been examined [3].

We focus in the nonequilibrium dynamics of a binary mixture of rodlike nematic polymers under shear flow. To do so, we derive from density functional theory (DFT) a mesoscopic free energy in terms of the alignment tensor for each component. We proceed to investigate their dynamical behavior using the well known mesoscopic Doi–Hess theory, which lead to a set of nonlinear differential equations [4,5,6]. Finally, we examine the total alignment of each component and its dependencies with the physical properties of the system.

[1] S. H. L. Klapp and S. Hess, Phys. Rev. E 81, 051711 (2010).
[2] D. Strehober, H. Engel and S. H. L. Klapp, Phys. Rev. E 88, 012505 (2013).
[3] F. Tardani, L. Gentile, G. A. Ranieri and C. La Mesa, J. Phys. Chem. C, 117, 8556 (2013).
[4] S. Hess, Z.Naturforsch. A 31a, 1034 (1976).
[5] M. Doi, J.Polym. Sci., Polym. Phys. Ed. 19, 229 (1981).
[6] S. Hess and M.  Kröger, J.Phys.: Cond. Matter, 16, S3835 (2004).