Berlin 2015 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 35: Complex Fluids and Soft Matter - Part I (joint session DY/ CPP / BP)

DY 35.1: Talk

Wednesday, March 18, 2015, 15:00–15:15, BH-N 333

Particle segregation in a sedimenting bidisperse soft sphere system — Matthias Kohl and •Michael Schmiedeberg — Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany

We explore the sedimentation process of a binary soft colloidal sphere system. In case of large overlaps of the particles the segregation dynamics differs significantly from that of hard particles. By using Brownian dynamics simulations and theoretical predictions, we find new complex states [1]. For example, multiple-phase-stackings where large particles gather both at the top and the bottom of the system or metastable network-like structures occur. We analyze the comprehensive dynamics of the segregation process. Usually, we observe a multiple-step process: First there is local segregation, then clusters are formed, and finally the clusters sink to their equilibrium position.

[1] M. Kohl and M. Schmiedeberg, Soft Matter 10, 4340 (2014).