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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 46: Active Matter IV (joint session DY/BP/CPP)

CPP 46.2: Vortrag

Donnerstag, 30. März 2023, 10:00–10:15, ZEU 160

Force on probe in a confined active fluid — Shuvojit Paul¹, •Ashreya Jayaram², N Narinder¹, Thomas Speck², and Clemens Bechinger¹ — ¹Fachbereich Physik, Universität Konstanz, 78464 Konstanz, Germany — ²Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany

When immersed in a dispersion of smaller "depletants", a colloidal particle experiences depletion forces in the presence of another colloidal particle or under confinement. While the nature of these forces is well-established for passive systems, much less is known about the consequence of making the depletants self-propelled or "active". In this work, we consider a large, optically trapped probe under circular confinement surrounded by smaller active Janus particles. We find that the force experienced by the probe varies non-monotonically as the distance between the colloid and the confinement is increased. To rationalize this observation, we relate the measured force to the active stress and, subsequently, to the microstructure of the surrounding active fluid. Going beyond synthetic active matter, our work could shed light on the organization of intracellular entities in biological systems.