Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.47: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Active Brownian Motion in Crowded Environment — •Parmida Shabestari1, Felix Kümmel1, Ivo Buttinoni2, and Clemens Bechinger1,3 — 12. Physikalisches Institut, Universität Stuttgart, Germany — 2Department of Materials, ISA, ETH Zürich, Switzerland — 3Max Planck Institute for Intelligent Systems, Stuttgart, Germany
Artificial active swimmers, i.e. Janus particles, suspended in a critical binary mixture, are capable of a self-diffusiophoretic motion upon illumination. In previous experiments, the dynamics of such swimmers close to walls and periodic arrays of rigid obstacles has been investigated [1]. Here, we investigate the dynamics of active swimmers in the presence of a bath of Brownian particles. Such crowded conditions closely resemble the situation of e.g. bacteria in their natural habitat and thus allows to understand how the interaction of active and passive particles affects the particle dynamics and their density distribution. Depending on the density of the Brownian background particles we observe the formation of metastable channels, whose shape and lifetime strongly depend on the densities of active and passive particles but also on the strength of the propulsion force.
[1] VOLPE G, BUTTINONI I, VOGT D, KÜMMERER H J AND BECHINGER C 2011 MICROSWIMMERS IN PATTERNED ENVIRONMENTS SOFT MATTER 7 8810-5