Berlin 2018 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 79: Wetting, Microfluidics and Confined Liquids II
CPP 79.5: Talk
Friday, March 16, 2018, 10:30–10:45, PC 203
Non-equilibrium surface critical dynamics in a confined binary liquid mixture — •Sutapa Roy1, Felix Höfling2, and Siegfried Dietrich1 — 1Max-Planck-Institute for Intelligent Systems, Stuttgart, Germany and Institute for Theoretical Physics IV, University of Stuttgart, Germany — 2Freie Universität Berlin, Department of Mathematics and Computer Science, Berlin, Germany
Close to a solid surface the static and dynamic properties of a fluid deviate significantly from their bulk behaviour. In this context, by using molecular dynamics simulations, we investigate the rich non-equilibrium relaxation dynamics of a binary liquid mixture [1] confined to a slit pore, fully respecting hydrodynamic conservation laws. A sudden temperature quench of the liquid from the disordered phase to its bulk demixing critical point yields a non-equilibrium response. The corresponding dynamics, characterised by the two-time auto-correlator of the position-dependent order parameter, exhibits aging and scaling [2]. Analysis of the aging behaviour allows us to quantify the crossover from surface- to bulk-like dynamics. Our results for the surface adsorption profiles in equilibrium are compared with recent theoretical predictions for the canonical ensemble [3]. To the best of our knowledge, this study is the first one to explore both surface and bulk aging phenomena of a liquid at criticality.
[1] S. Roy, S. Dietrich & F. Höfling, J. Chem. Phys. 145 134505 (2016). [2] S. Roy, F. Höfling & S. Dietrich, unpublished (2017). [3] M. Gross, O. Vasilyev, A. Gambassi & S. Dietrich, Phys. Rev. E 94 022103 (2016).