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DY: Fachverband Dynamik und Statistische Physik

DY 33: Nonlinear Dynamics II

DY 33.1: Vortrag

Freitag, 26. März 2010, 10:45–11:00, H46

Control of phase separation in binary mixtures — •Alexei Krekhov, Vanessa Weith, and Walter Zimmermann — Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany

The results on new effective mechanisms to create periodic stripe patterns during the phase separation process in binary mixture will be presented. Pattern selection mechanism operating in the process of phase separation under directional quenching will be discussed. It will be demonstrated that the wavelength of periodic stripe patterns is uniquely selected by the velocity of quench interface. Theoretical analysis of phase separation in the presence of spatially periodic forcing will be presented. In this case stripe patterns with the periodicity slaved to the externally imposed one can be stabilized against coarsening above some critical modulation amplitude. The results will be compared with the experiments on thermal patterning in polymer blends. Another possibility to create regular structures in the phase-separating binary mixture by adding Janus particles will be discussed. It will be shown that due to a novel type of dynamic interparticle interaction equally oriented Janus particles form a periodic array of interfaces. The results might promote the development of tools to fabricate regular structures in material science and gain better insight into the basic mechanisms to control the spontaneous pattern formation processes in other nonequilibrium systems.