Regensburg 2016 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 39: Active Matter (Joint Session with DY)

BP 39.8: Vortrag

Mittwoch, 9. März 2016, 11:45–12:00, H46

Hydrodynamicaly-Tuned Phase Separation of Spherical Micro-Swimmers — •Johannes Blaschke, Karthik Menon, Maurice Maurer, and Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany

Active motion of microorganisms and artificial micro-swimmers is relevant both to real world applications, as well as for posing fundamental questions in non-equilibrium statistical physics. A striking feature of their collective behaviour is that, for sufficiently strong self-propulsion dense clusters coexists with a low-density disordered surrounding. Due to the required computational effort, active particles are often modelled by neglecting the full hydrodynamic interactions.

However, real micro-swimmers, such as ciliated microorganisms, catalytic janus particles, or emulsions of active droplets, employ propulsion mechanisms reliant on hydrodynamics.

Here we examine the influence of the full hydrodynamic interactions on the motility-induced phase separation of spherical micro-swimmers in quasi-2D confinement. We follow up on previous work [1] by increasing the total system size allowing us to quantitatively resolve the phase-coexistence regime.

[1] A. Zöttl and H. Stark, PRL 112, 118101 (2014)