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Self-assembled controllable microswimmers
Grosjean, Galien; Lagubeau, Guillaume
2015American Physical Society 68th Annual DFD Meeting
 

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Keywords :
Microswimmer; Self-assembly
Abstract :
[en] Because they cause a deformation of the interface, floating particles interact. In particular, identical particles attract each other. To counter this attraction, particles possessing a large magnetic moment m are used. When m is perpendicular to the surface, dipole-dipole interaction is repulsive. This competition of forces can lead to the spontaneous formation of organized structures. By using submillimetric steel spheres for which m is proportional to B, we can precisely tune the interdistances in the system. Here, we deform these self-assemblies by adding an oscillating horizontal field Bx which induces a horizontal contribution mx to the magnetic moment. Time reversal symmetry is broken in the system, leading to locomotion at low Reynolds number. Indeed, a body undergoing non-reciprocal deformations, i.e. breaking time reversal symmetry, is known to be able to swim in viscous regime. Moreover, swimming direction depends on the orientation of field Bx, meaning that swimming trajectories can be finely controlled [8] as shown in figure 2. A simple model allows to understand the breaking of symmetry in a three-particle system. A study of the vibration modes in a pair of particle gives further informations on the dynamics, being the basis for larger assemblies. Because this magnetocapillary system spontaneously forms by self-assembly, it allows miniaturization and various possible applications such as cargo transport or solvent ows. It is highly versatile, being composed of simple passive particles and controlled by magnetic fields of the order of 1 mT.
Disciplines :
Physics
Author, co-author :
Grosjean, Galien ;  Université de Liège > Département de physique > Physique statistique
Lagubeau, Guillaume;  Universidad de Santiago de Chile
Language :
English
Title :
Self-assembled controllable microswimmers
Publication date :
23 November 2015
Event name :
American Physical Society 68th Annual DFD Meeting
Event organizer :
American Physical Society
Event place :
Boston, United States - Massachusetts
Event date :
du 22 novembre 2015 au 24 novembre 2015
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
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since 09 August 2016

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