Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 72: Microswimmers, Active Liquids I (joint session CPP, BP, DY)

CPP 72.2: Hauptvortrag

Donnerstag, 19. März 2015, 16:15–16:45, PC 203

Active motion: From single microswimmers to their emergent collective behavior — •Holger Stark — Institut für Theoretische Physik, Technische Universität Berlin, D-10623 Berlin

Active motion of artificial and biological microswimmers is relevant in microfluidics and biological applications but also poses fundamental questions in nonequilibrium statistical physics. Mechanisms of single microswimmers need to be understood and a detailed modeling of microorganisms helps to explore their complex cell design and their behavior. The collective motion of microswimmers generates appealing dynamic patterns.

In this talk I review some of our work modeling biological microswimmers such as E. coli [1] and the African trypanosome [2], the causative agent of the sleeping sickness, in order to contribute to their better understanding. Using simpler model microswimmers such as active Brownian particles, I will demonstrate their emerging collective behavior. Hydrodynamic interactions lead to a clustering transition dependent on swimmer type [3] or to the formation of fluid pumps in 3D harmonic traps [4]. Self-phoretic active colloids show biomimetic auto-chemotactic behavior, which can induce dynamic clustering, oscillating clusters, or a chemotactic collaps [5].

[1] R. Vogel and H. Stark, Phys. Rev. Lett. 110, 158104 (2013).

[2] D. Alizadehrad et al., to be published in PLoS Comp. Biol.

[3] A. Zöttl and H. Stark, Phys. Rev. Lett. 112, 118101 (2014).

[4] M. Hennes et al., Phys. Rev. Lett. 112, 238104 (2014).

[5] O. Pohl and H. Stark, Phys. Rev. Lett. 112, 238303 (2014).