Dresden 2017 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 14: Microswimmers I (joint session DY/BP)
DY 14.2: Talk
Tuesday, March 21, 2017, 10:00–10:15, HÜL 186
Fission and fusion of microswimmer clusters — •Andreas Kaiser1, Francisca Guzmán-Lastra2, and Hartmut Löwen2 — 1Materials Science Division, Argonne National Laboratory, 9700 South Cass Ave, Argonne, Illinois 60439, USA — 2Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
Fission and fusion processes of particles clusters occur in many areas of physics and chemistry from subnuclear to astronomic length scales. Here we study fission and fusion of magnetic microswimmer clusters [1] as governed by their hydrodynamic and dipolar interactions. Rich scenarios are found which depend crucially on whether the swimmer is a pusher or a puller.
A linear magnetic chain of pullers is stable while a pusher chain shows a cascade of fission processes as the self-propulsion velocity is increased. Contrarily, magnetic ring clusters show fission for any type of swimmer. Moreover, we find a plethora of possible fusion scenarios if a single swimmer collides with a ringlike cluster and two rings spontaneously collide [2].
[1] A. Kaiser, K. Popowa, and H. Löwen, Phys. Rev. E 92, 012301 (2015)
[2] F. Guzmán-Lastra, A. Kaiser, and H. Löwen, Nature Commun. 7, 13519 (2016)