Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 9: Statistical Physics far from Thermal Equilibrium

DY 9.8: Vortrag

Montag, 12. März 2018, 12:00–12:15, BH-N 334

Thermodynamic signatures of shear-induced transitions in confined colloidal suspensions in shear flow — •Sascha Gerloff and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

Colloidal suspensions under the combined influence of shear flow and strong spatial confinement display a rich non-equilibrium behavior [1]. One intriguing question is how these dynamical transitions are reflected by macroscopic quantities, such as the shear stress and thermodynamic functions. Here, we perform overdamped Brownian dynamic (BD) simulations of charged colloids under shear flow confined to a narrow slitpore. In equilibrium, the colloids organize in crystalline layers, whose in-plane structure depends on the slitpore width [2]. Applying shear flow introduces new types of structural transitions driven by the collective motion of the colloids [1]. We investigate the work- and heat rate, as well as the entropy production related to different steady states. These quantities are calculated from particle trajectories in the spirit of stochastic thermodynamics [3]. We find that transitions between different steady states are reflected in these thermodynamic quantities. In particular, the work- and heat rates are closely related to the shear stress, which characterizes the rheological response of the system.
[1] S. Gerloff and S. H. L. Klapp, Phys. Rev. E 94, 062605 (2016).
[2] A. Fortini and M. Dijkstra, J. Phys. Condens. Matter 18, L371 (2006).
[3] T. Speck and U. Seifert, Phys. Rev. E 79, 178302 (2009).