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BP: Fachverband Biologische Physik

BP 19: Active Matter III (joint session DY/BP/CPP)

BP 19.2: Talk

Wednesday, March 20, 2024, 10:00–10:15, BH-N 334

Active particles interacting via phase-separating chemicals — •Dennis Schorn, Aritra K. Mukhopadhyay, and Benno Liebchen — Institut für Physik Kondensierter Materie, Technische Universität Darmstadt, Germany

Synthetic active particles self-propel by catalyzing a certain chemical reaction and moving up or down the resulting concentration gradient. In this talk, we present our study of the collective dynamics of chemotactic active particles which interact via self-produced chemicals that have an intrinsic tendency to phase separate. When the chemical interactions are attractive (chemoattraction), the particles aggregate to form a large cluster. In contrast, chemorepulsive particles exhibit two distinct patterns: a stationary foam-like structure and an oscillating stripe pattern. We explain the origins of these structures through a comprehensive linear stability analysis of our system. Our findings underscore that the intricate interplay between chemical phase separation and particle chemotaxis induces new instabilities, leading to the formation of unique patterns.

Keywords: Active Matter; Chemotaxis; Pattern Formation; Collective Dynamics