Regensburg 2016 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 27: Poster - Statistical Physics, Critical Phenomena, Brownian motion

DY 27.1: Poster

Tuesday, March 8, 2016, 18:15–21:00, Poster C

Phase separation in mixtures of soft particles in 2D: A dynamical DFT study — •Alexander Kraft and Sabine H. L. Klapp — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

We investigate binary mixtures of soft particles (e.g. of Gaussian core type) in a two-dimensional system within the framework of density functional theory and dynamical density functional theory. Depending on system parameters, we observe homogeneous mixing or a phase separation of both species. In order to classify the system behaviour, we calculate the phase diagram, i.e. the spinodal and binodal lines, based on thermodynamic stability conditions. Furthermore, we compare the regions of thermodynamic stability with estimates based on linear stability analysis of the homogeneously mixed system. In contrast to previous studies [1,2], in this work, we focus on a two-dimensional system, in order to gain access to the behaviour in flat geometries or on surfaces. We also discuss possible control strategies for the manipulation of the phase separation process.

• [1] A. A. Louis, P. G. Bolhuis, and J. P. Hansen, Phys. Rev. E 62, 7961 (2000)
• [2] A. J. Archer and R. Evans, Phys. Rev. E 64 (2001)