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DY: Fachverband Dynamik und Statistische Physik

DY 14: Microswimmers (joint session DY/CPP)

DY 14.2: Vortrag

Montag, 16. März 2020, 15:30–15:45, ZEU 160

Fine balance of chemotactic and hydrodynamic torques: When microswimmers orbit a pillar just once — •Chenyu Jin^{1, 2}, Jérémy Vachier¹, Soumya Bandyopadhyay³, Tamara Macharashvili⁴, and Corinna Maass¹ — ¹Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany. — ²University of Bayreuth, Bayreuth, Germany — ³Purdue University, West Lafayette, USA — ⁴Princeton University, Princeton, USA

Self-propelling liquid crystal droplets in an aquaeous surfactant solution is an excellent model system for biological microswimmers: they exhibit chemotaxis and negative autochemotaxis, and they interact with boundaries. Here we study the detention statistics of these droplet microswimmers attaching to microfluidic pillars. The repulsive trail of spent fuel shed by themselves biases them to detach from pillars in a specific size range after orbiting the pillars just once. We have designed a microfluidic assay recording microswimmers in pillar arrays of varying diameter, derived detention statistics via digital image analysis, and interpreted these statistics via the Langevin dynamics of an active Brownian particle model. By comparing data from orbits with and without residual chemical field, we can independently estimate quantities such as hydrodynamic and chemorepulsive torques, chemical coupling constants and diffusion coefficients, as well as their dependence on environmental factors such as wall curvature. This type of analysis is generalizable to many kinds of microswimmers.