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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/147684
Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field
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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.
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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.. Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field. _Physical Review Applied_. 2019. Vol. 11, núm. 4, pàgs. 044019. [consulta: 23 de gener de 2026]. ISSN: 2331-7019. [Disponible a: https://hdl.handle.net/2445/147684]