Regensburg 2016 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 39: Active Matter (Joint Session with DY)
BP 39.6: Vortrag
Mittwoch, 9. März 2016, 11:15–11:30, H46
Using motility patterns to manipulate self-propelled particles — •Celia Lozano1,2, Borge ten Hagen3, Hartmut Löwen3, and Clemens Bechinger1,2 — 12. Physikalisches Institut, Universitaet Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Max-Planck-Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany — 3Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, D-40225 Düsseldorf, Germany.
Active colloidal particles capture many aspects of motile microorganisms and are therefore considered to provide a suitable model system to understand self-organization and pattern formation in living and non-equilibrium systems. Contrary to most experimental situations where the particle motility is position-independent, here we investigate a system where the self-propulsion velocity is spatially modulated. This is achieved by a light-induced propulsion mechanism and a spatially modulated light field [1]. By subjecting a dilute active colloidal suspension to an asymmetric and periodic light field, we demonstrate directed particle motion. In addition, we show, that particle transport is highly sensitive to the particle size and thus acts also as a filtering device for active suspensions [2].
[1] VOLPE G, BUTTINONI I, VOGT D, KÜMMERER H J AND BECHINGER C 2011 MICROSWIMMERS IN PATTERNED ENVIRONMENTS SOFT MATTER 7, 8810 (2011) [2] C. Lozano, B. ten Hagen, H. Löwen, and C. Bechinger. In preparation