SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 10: Active Matter II (joint session DY/BP/CPP)
DY 10.7: Vortrag
Montag, 27. März 2023, 17:00–17:15, ZEU 160
Arrested by heating — •Corinna C. Maass1,2, Prashanth Ramesh2,1, and Maziyar Jalaal3 — 1University of Twente, Enschede, Netherlands — 2MPI for Dynamics and Self-organization, Göttingen, Germany — 3Universiteit van Amsterdam, Amsterdam, Netherlands
Active droplets are a class of microswimmers driven by chemical reactions at the droplet interface. Typically, the activity is powered by an advection-diffusion instability in the chemohydrodynamic fields around the droplet that is characterised by the Péclet number Pe of chemical transport. With increasing Pe, higher hydrodynamic modes at the interface cause the droplet to transition from inactivity, to steady, to reorienting, to fully unsteady motion. Here, we demonstrate that it is possible to change Pe reversibly and in situ by thermally activated changes in the chemical enviroment, and thereby to control the motility of the droplet.