SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Microswimmers and Fluid Physics of Life (joint session DY/CPP)

CPP 38.7: Talk

Wednesday, March 29, 2023, 16:45–17:00, MOL 213

Role of cohesion in the flow of active particles through bottlenecks — •Timo Knippenberg¹, Anton Lüders¹, Celia Lozano², Peter Nielaba¹, and Clemens Bechinger¹ — ¹Fachbereich Physik, Universität Konstanz, Germany — ²Bosonit, AI Department, La Rioja, Spain

Recently, many studies examined the intermittent flow of granular particles through bottleneck-shaped apertures. A common framework which describes the occurring flow statistics was empirically found for a wide range of such systems reaching from microscopic colloids and macroscopic grains up to sheep herds. However, similar studies with active matter are scarce and do merely consider steric agent interactions. Here, we experimentally and numerically study the flow of programmable, colloidal active Janus swimmers through bottlenecks. Our results confirm the applicability of the above-mentioned statistical framework of granular intermittent flow also on complex-interacting active microswimmers. Moreover, upon increasing the strength of interparticle cohesion, we find a transition from an arch-dominated clogging regime to a cohesion-dominated regime where droplets form at the outlet. The flow-rate only weakly depends on the cohesion strength in the arch-dominated regime, which suggests that cohesion needs not necessarily to hinder particle flow through geometric constrictions or pores.