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Title: Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field
Author: Bryan, M. T.
García-Torres, J.
Martin, E. L.
Hamilton, J. K.
Calero Borrallo, Carles
Petrov, P. G.
Winlove, C. P.
Pagonabarraga Mora, Ignacio
Tierno, Pietro
Sagués i Mestre, Francesc
Ogrin, F. Y.
Keywords: Magnetisme
Issue Date: 8-Apr-2019
Publisher: American Physical Society
Abstract: Self-propulsion of magneto-elastic composite microswimmers is demonstrated under a uniaxial field at both the air-water and the water-substrate interfaces. The microswimmers are made of elastically linked magnetically hard Co-Ni-P and soft Co ferromagnets, fabricated using standard photolithography and electrodeposition. Swimming speed and direction are dependent on the field frequency and amplitude, reaching a maximum of 95.1 μm/s on the substrate surface. Fastest motion occurs at low frequencies via a spinning (air-water interface) or tumbling (water-substrate interface) mode that induces transient inertial motion. Higher frequencies result in low Reynolds number propagation at both interfaces via a rocking mode. Therefore, the same microswimmer can be operated as either a high or a low Reynolds number swimmer. Swimmer pairs agglomerate to form a faster superstructure that propels via spinning and rocking modes analogous to those seen in isolated swimmers. Microswimmer propulsion is driven by a combination of dipolar interactions between the Co and Co-Ni-P magnets and rotational torque due to the applied field, combined with elastic deformation and hydrodynamic interactions between different parts of the swimmer, in agreement with previous models.
Note: Reproducció del document publicat a:
It is part of: Physical Review Applied, 2019, vol. 11, num. 4, p. 044019
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ISSN: 2331-7019
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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