Berlin 2018 – scientific programme

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BP: Fachverband Biologische Physik

BP 25: Active Matter DY III (joint session DY/CPP/BP)

BP 25.6: Talk

Wednesday, March 14, 2018, 17:00–17:15, BH-N 243

Diffusive dynamics of complex colloidal particles in active suspensions of microswimmers — •Florian von Rüling, Francine Kolley, Patricia Dähmlow, Hajnalka Nadasi, and Alexey Eremin — Otto von Guericke University Magdeburg

We report experimental studies on the active motion of puller-type microswimmers Chlamydomonas reinhardtii (C.R.) and the entrainment and the diffusion of complex passive particles in thin capillaries. C.R., self-propelled unicellular alga, swims in the regime of low Reynolds number due to its flagellar motion breaking time-reversal symmetry. Having an eyespot, the alga shows phototactic behaviour. Employing a particle tracking algorithm and polarising microscopy, we explore the enhancement of the diffusion of the sphere- and rod-shaped particles by swimming algae. Furthermore, we demonstrate the effect of the microswimmer-induced flow on the director field of nematic droplets dispersed in the active colloid.