Dresden 2011 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Nonlinear Dynamics II

DY 26.7: Vortrag

Mittwoch, 16. März 2011, 18:00–18:15, ZEU 255

Effects of Janus particles in a phase-separating binary mixture — Alexei Krekhov, •Vanessa Weith, and Walter Zimmermann — Theoretische Physik I, Universität Bayreuth, 95440 Bayreuth, Germany

A new class of colloidal particles, so-called Janus particles, have been synthesized in large quantities [1], recently. Janus particles represent colloids with a different chemical composition of the surface of the two hemispheres of a particle. Each half of a particle may be wetted preferentially by one component of a binary mixture.

We suggest a mean field approach for the dynamics of phase separation in binary mixtures in the presence of Janus particles. The numerical results on the dynamics of Janus particles are presented. The different wetting properties of the two hemispheres of a Janus particle cause a spatial variation of the concentration in their neighborhood. Accordingly, the Janus particles are trapped to interfaces in the two-phase region, leading to a complex particle and interface dynamics. The Janus particles also induce an interesting interface ordering in one and two dimensions, leading to layered structures with small tunable length scale.

[1] A. Walther and A. H. E. Müller, Soft Matter 4, 663 (2008)