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BP: Fachverband Biologische Physik

BP 24: Poster B: Active Biological Matter, Cell Mechanics, Systems Biology, Computational Biophysics, etc.

BP 24.7: Poster

Tuesday, March 23, 2021, 16:00–18:30, BPp

Capillary Action In Active Brownian Particles — •Shauri Chakraborty, Adam Wysocki, and Heiko Rieger — Department of Theoretical Physics and Center for Biophysics, Saarland University, Saarbruecken 66123, Germany

We study the rise of active Brownian particles against gravity in a thin capillary tube. Capillarity, a well-understood phenomena in classical liquids, is known to originate due to attractive interactions between the liquid molecules and the capillary walls and the inter-molecular attractive forces among the liquid molecules. By contrast, we observe capillary rise in a minimal model of active Brownian particles with purely repulsive interactions. In such a system, an effective force of attraction emerges because of a damping due to the inter-particle collisions and the particle-wall interactions. We also validate in our numerical simulations, whether our findings agree with the results obtained for a similar system, previously studied in an active lattice gas (ALG) setting which can be described by exact hydrodynamic equations on macroscopic scales.