Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Colloids and Complex Liquids I
CPP 41.3: Vortrag
Donnerstag, 14. März 2013, 10:15–10:30, H40
Active Brownian motion of asymmetric particles — •Felix Kümmel1, Ivo Buttinoni1, Giovanni Volpe3 und Clemens Bechinger1,2 — 12. Physikalisches Institut, Universität Stuttgart, Germany — 2Max-Plack-Institut für Intelligente Systeme, Stuttgart, Germany — 3Bilkent University, Ankara, Turkey
Recently, various systems of active Brownian particles with simple geometries have been studied. Lately, a novel type of spherical active particles being propelled by the local demixing in a binary liquid has been experimentally realized [1]. Here, we investigate the active Brownian motion of asymmetric (L-shaped) particles. We observe an effective torque acting on the particles which results in a circular motion. We investigate this motion both under bulk conditions and close to walls where the torque leads either to the reflection or a sliding along the wall, depending on the direction of the torque. In addition, we investigate the self-propulsion of asymmetric particle under the influence of an external gravitational field. The resulting symmetry breaking causes a gravitactical behavior which strongly depends on the shape and the driving force of the swimmer.
[1] Volpe, G., I. Buttinoni, et al, Soft Matter 7, 8810 (2011)