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Lorentz Force-Driven Autonomous Janus Swimmers

Abstract : Autonomous swimmers have been intensively studied in recent years due to their numerous potential applications in many areas, ranging from biomedicine to environmental remediation. Their motion is based either on different self-propulsion mechanisms or on the use of various external stimuli. Herein, the synergy between the ion flux around self-electrophoretic Mg/Pt Janus swimmers and an external magnetic field is proposed as an efficient alternative mechanism to power swimmers based on the resulting Lorentz force. A strong magnetohydrodynamic effect is observed due to the orthogonal combination of magnetic field and spontaneous ionic currents, leading reciprocally to an increase of the swimmer speed by up to two orders of magnitude. Furthermore, the trajectory of the self-propelled swimmers can be controlled by the orientation of the magnetic field, due to the presence of an additional torque force caused by a vertical cation flux along the swimmer edges, resulting in predictable clockwise or anticlockwise motion. In addition, this effect is independent of the swimmer size, since a similar type of chiral motion is observed for macro-and microscale objects.
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https://hal.archives-ouvertes.fr/hal-03451812
Contributor : Laurent Bouffier Connect in order to contact the contributor
Submitted on : Friday, November 26, 2021 - 4:18:25 PM
Last modification on : Tuesday, January 4, 2022 - 6:27:14 AM

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Gerardo Salinas, Kostiantyn Tieriekhov, Patrick Garrigue, Neso Sojic, Laurent Bouffier, et al.. Lorentz Force-Driven Autonomous Janus Swimmers. Journal of the American Chemical Society, American Chemical Society, 2021, 143 (32), pp.12708-12714. ⟨10.1021/jacs.1c05589⟩. ⟨hal-03451812⟩

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