Friction Induces Anisotropic Propulsion in Sliding Magnetic Microtriangles
| Autor: | Gaspard Junot, Sergi G. Leyva, Christoph Pauer, Carles Calero, Ignacio Pagonabarraga, Tim Liedl, Joe Tavacoli, Pietro Tierno |
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| Rok vydání: | 2022 |
| Předmět: |
micromotors
density Nanopartícules Friction Propietats magnètiques Mechanical Engineering Bioengineering General Chemistry Condensed Matter Physics Magnetics Motion Magnetic Fields magnetism nanowire Magnetic properties soft-lithography Nanoparticles Anisotropy active colloids General Materials Science Fricció shape-anisotropy |
| Zdroj: | Nano Letters. 22:7408-7414 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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