Optimal motion of triangular magnetocapillary swimmers

Physical chemistry; Physics; Characteristic relaxation time; Equilibrium properties; External magnetic field; Ferromagnetic particles; Interparticle distances; Lattice Boltzmann method; Lattice Boltzmann simulations; Liquid-liquid interfaces; Magnetic fields

Abstract :

[en] A system of ferromagnetic particles trapped at a liquid-liquid interface and subjected to a set of magnetic fields (magnetocapillary swimmers) is studied numerically using a hybrid method combining the pseudopotential lattice Boltzmann method and the discrete element method. After investigating the equilibrium properties of a single, two, and three particles at the interface, we demonstrate a controlled motion of the swimmer formed by three particles. It shows a sharp dependence of the average center-of-mass speed on the frequency of the time-dependent external magnetic field. Inspired by experiments on magnetocapillary microswimmers, we interpret the obtained maxima of the swimmer speed by the optimal frequency centered around the characteristic relaxation time of a spherical particle. It is also shown that the frequency corresponding to the maximum speed grows and the maximum average speed decreases with increasing interparticle distances at moderate swimmer sizes. The findings of our lattice Boltzmann simulations are supported by bead-spring model calculations. © 2019 Author(s).

Disciplines :

Physics

Author, co-author :

Sukhov, A.; Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Fürther Straße 248, Nürnberg, 90429, Germany

Ziegler, S.; Institute for Theoretical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, 91054, Germany

Xie, Q.; Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, Eindhoven, 5600MB, Netherlands

Trosman, O.; Institute for Theoretical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, 91054, Germany

Pande, J.; Department of Physics, Bar-Ilan University, Ramat Gan, 52900, Israel

Grosjean, Galien ; Université de Liège - ULiège > Département de physique > Département de physique

Hubert, Maxime

Vandewalle, Nicolas ; Université de Liège - ULiège > Département de physique > Physique statistique

Smith, A.-S.; Institute for Theoretical Physics, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, 91054, Germany

Harting, J.; Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Fürther Straße 248, Nürnberg, 90429, Germany, Department of Applied Physics, Eindhoven University of Technology, P.O. Box 513, Eindhoven, 5600MB, Netherlands

Language :

English

Title :

Optimal motion of triangular magnetocapillary swimmers

Publication date :

2019

Journal title :

Journal of Chemical Physics

ISSN :

0021-9606

eISSN :

1089-7690

Publisher :

American Institute of Physics Inc.

Volume :

151

Issue :

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

DFG - Deutsche Forschungsgemeinschaft [DE]
Sociedade Portuguesa de Pediatria

Available on ORBi :

since 19 December 2021

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