Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 67: Poster: Active Matter, Microswimmers

DY 67.16: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Pair Interactions of heat driven Janus particles — •Nicola Söker and Frank Cichos — Molecular Nanophotonics, Institut für Experimentalphysik I, Fakultät für Physik und Geowissenschaften, Universität Leipzig

Heat driven Janus particles as micro swimmers are based on self-thermophoresis, an thus the generation of interfacial flows induced by an optical heating of a hemispherically gold coated polymer particle. This non-equilibrium process adds even more complexity to a fluctuating hydrodynamic description of the motion and the interactions of such particles with the environment. In this work an ensemble of heat driven 1mu Janus particles in a thin film of water was observe to get statistics of the noise dominated pair interactions between two active Janus particles in the overdamped limit. Those interactions are split into two contributions. At first the additional heat flow from the other particle altering the overall temperature field and hence the thermos-osmotic forces exerted on the fluid at the particle boundary. And second, hydrodynamic effects, mainly the presence of a second swimmer and its constraints on the fluid flow field. The splitting is done by a comparison with another experiment where only the former contribution is present.