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Published version

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2022-11-15

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cc-by (c) Junot, Gaspard, et al., 2022
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/195176

Friction induces anisotropic propulsion in sliding magnetic microtriangles

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https://doi.org/10.1021/acs.nanolett.2c02295

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.

Subject

Propietats magnètiques, Nanopartícules, Fricció

Subject (English)

Magnetic properties, Nanoparticles, Friction

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Articles publicats en revistes (Física de la Matèria Condensada)

Citation

JUNOT, Gaspard, et al. Friction induces anisotropic propulsion in sliding magnetic microtriangles. Nano Letters. 2022. Vol. 22, num. 7408-7414. ISSN 1530-6984. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/195176

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