Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/147684
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 Ferromagnetisme Fotolitografia Magnetism Ferromagnetism Photolithography |
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: https://doi.org/10.1103/PhysRevApplied.11.044019 |
It is part of: | Physical Review Applied, 2019, vol. 11, num. 4, p. 044019 |
URI: | http://hdl.handle.net/2445/147684 |
Related resource: | https://doi.org/10.1103/PhysRevApplied.11.044019 |
ISSN: | 2331-7019 |
Appears in Collections: | Articles publicats en revistes (Física de la Matèria Condensada) |
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File | Description | Size | Format | |
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690529.pdf | 3.36 MB | Adobe PDF | View/Open |
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