Title:
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Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field
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Author:
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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.
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Magnetisme -Ferromagnetisme -Fotolitografia -Magnetism -Ferromagnetism -Photolithography |
Rights:
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(c) American Physical Society, 2019
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Document type:
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Article Article - Published version |
Published by:
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American Physical Society
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