Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 46: Poster Session: Complex Fluids, Soft Matter, Active Matter, Glasses and Granular Materials
DY 46.18: Poster
Donnerstag, 8. September 2022, 15:00–18:00, P2
Two orientational relaxation times of self-propelled ellipsoidal swimmers — •Gordei Anchutkin1, Viktor Holubec2, Artem Ryabov3, and Frank Cichos1 — 1Molecular Nanophotonics Group, Peter Debye Institute for Soft Matter Physics, Leipzig University, 04103 Leipzig, Germany — 2Institute for Theoretical Physics, Leipzig University, 04103 Leipzig, Germany — 3Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University, CZ-180 00 Praha, Czech Republic
The active motion of microswimmers has attracted broad interest for the last decades. A variety of active particles with different shapes and designs have been demonstrating various applications from biosensing to synergistic drug delivery most of them, though, with spherical particles involving a single orientational relaxation time. To generalize the complexity of active microswimmers* behavior, we investigate the fundamentals of active motion for microswimmers with multiple timescales of rotational diffusion. We investigate Janus ellipsoids thermophoretically propelled along the short axis of the ellipsoid. We report three different motion regimes of Janus ellipsoids: the active ballistic motion, run and tumble, and the diffusive regime. Using mean squared displacement analysis, we describe each regime and the corresponding time scales and show the coupling between translational and orientational motions. Our experimental results are compared to a theoretical model of an active ellipsoid motion. The different modes of active motion on different timescales deliver interesting perspectives to explore the interaction with obstacles and other particles at different densities.