Regensburg 2019 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 6: Active Matter A (joint session DY/CPP)
CPP 6.3: Talk
Monday, April 1, 2019, 10:15–10:30, H20
Magnetocapillary Microswimmers — •Maxime Hubert1,2, Galien Grosjean2, and Nicolas Vandewalle2 — 1PULS group, Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany — 2GRASP Lab, CESAM UR, University of Liège, Liège, Belgium
The study of artificial microswimmers is of major interest in many area of physics, from the understanding of microorganisms swimming strategies to applications in microfluidic and micromanipulation. While there exists numerous theoretical studies on microswimmers, experimental realizations are technologically challenging. We focus in this presentation on a simple system made of three soft ferromagnetic particles trapped at air-water interfaces and self-assembling in triangles. Complex behaviors can arise under a time-dependent magnetic field. In particular, those assemblies can undergo deformations in non-time-reversible sequences, a necessary condition for low Reynolds number locomotion. Because of their controllability, such structures can be used for capture, transport and release of a microcargo, or the mixing of fluids at low Reynolds number. During this talk, the key mechanism for the collective motion of the beads is described from a numerical point of view and a model for their dynamics is discussed, opening the way for optimal control and efficiency of experimental magnetocapillary microswimmers.