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Title: Friction induces anisotropic propulsion in sliding magnetic microtriangles
Author: Junot, Gaspard
Leyva, Sergi G.
Pauer, Christoph
Calero Borrallo, Carles
Pagonabarraga Mora, Ignacio
Liedl, Tim
Tavacoli, Joe
Tierno, Pietro
Keywords: Propietats magnètiques
Magnetic properties
Issue Date: 15-Nov-2022
Publisher: American Chemical Society
Abstract: In viscous fluids, motile microentities such as bacteria or artificial swimmers often display different transport modes than macroscopic ones. A current challenge in the field aims at using friction asymmetry to steer the motion of microscopic particles. Here we show that lithographically shaped magnetic microtriangles undergo a series of complex transport modes when driven by a precessing magnetic field, including a surfing-like drift close to the bottom plane. In this regime, we exploit the triangle asymmetric shape to obtain a transversal drift which is later used to transport the microtriangle in any direction along the plane. We explain this friction-induced anisotropic sliding with a minimal numerical model capable to reproduce the experimental results. Due to the flexibility offered by soft-lithographic sculpturing, our method to guide anisotropic-shaped magnetic microcomposites can be potentially extended to many other field responsive structures operating in fluid media.
Note: Reproducció del document publicat a:
It is part of: Nano Letters, 2022, vol. 22, p. 7408-7414
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ISSN: 1530-6984
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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