2026-04-18T03:34:37Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1476842025-12-04T20:45:16Zcom_2072_1057col_2072_478822col_2072_478917

Microscale magneto-elastic composite swimmers at the air-water and water-solid interfaces under a uniaxial field 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. Magnetisme Ferromagnetisme Fotolitografia Magnetism Ferromagnetism Photolithography 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. 2020-01-13T16:37:02Z 2020-01-13T16:37:02Z 2019-04-08 2020-01-13T16:37:02Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevApplied.11.044019 Physical Review Applied, 2019, vol. 11, num. 4, p. 044019 https://doi.org/10.1103/PhysRevApplied.11.044019 info:eu-repo/grantAgreement/EC/H2020/665440/EU//ABIOMATER (c) American Physical Society, 2019 info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física de la Matèria Condensada)