Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 14: Microswimmers (joint session DY/CPP)
DY 14.2: Talk
Monday, March 16, 2020, 15:30–15:45, ZEU 160
Fine balance of chemotactic and hydrodynamic torques: When microswimmers orbit a pillar just once — •Chenyu Jin1, 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.