Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 31: Microswimmers DY II (joint session DY/CPP/BP)

BP 31.10: Vortrag

Donnerstag, 15. März 2018, 12:30–12:45, BH-N 243

Dynamical arrest in active emulsions — •Babak Vajdi Hokmabad and Corinna C. Maass — MPI für Dynamik und Selbstorganisation Göttingen

Liquid crystal (LC) droplets self-propel in an aqueous surfactant solution due to Marangoni flow at the droplet's interface. This propulsion is sustained by micellar solubilization of the LC phase. The solubilization leads to a secretion of filled surfactant micelles in the trail of the swimming droplet. This causes depletion of empty micelles in the trail and thereby trail avoidance. We have directly imaged the secretion and spreading of the filled micelles by adding fluorescent dye to the LC phase. The decay of the extracted Gaussian profiles in time is consistent with the theoretical diffusive spreading. Using this technique, we are able to visualize the chemotactic interaction of a swimmer with a trail. To study the collective dynamics of this autochemotaxis-dominated system we track individual swimmers in dense droplet ensembles in 2D and 3D. Results show that in a crowded system, a potential landscape is formed with local minima between the trails. We report on dynamical arrest of the swimmers in transient cages formed inside these local minima.