Rotation is an interesting type of motion that is currently involved in many technological applications. In this frame, different and sophisticated external stimuli to induce rotation have been developed. In this work, we have designed a simple and original self-propelled bimetallic Janus rotor powered by the synergy between a spontaneous electric and ionic current, produced by two coupled redox reactions, and a magnetic field, placed orthogonal to the surface of the device. Such a combination induces a magnetohydrodynamic vortex at each extremity of the rotor arm, which generates an overall driving force able to propel the rotor. Furthermore, the motion of the self-polarized object can be controlled by the direction of the spontaneous electric current or the orientation of the external magnetic field, resulting in a predictable clockwise or anticlockwise motion. In addition, these devices exhibit directional corkscrew-type displacement, when representing their displacement as a function of time, producing time-space specular behavior. The concept can be used to design alternative self-mixing systems for a variety of (micro)fluidic equipment.

Self-Sustained Rotation of Lorentz Force-Driven Janus Systems / G. Salinas, A. Kuhn, S. Arnaboldi. - In: JOURNAL OF PHYSICAL CHEMISTRY. C. - ISSN 1932-7447. - 127:30(2023 Jul 21), pp. 14704-14710. [10.1021/acs.jpcc.3c01597]

Self-Sustained Rotation of Lorentz Force-Driven Janus Systems

S. Arnaboldi
Ultimo
2023

Abstract

Rotation is an interesting type of motion that is currently involved in many technological applications. In this frame, different and sophisticated external stimuli to induce rotation have been developed. In this work, we have designed a simple and original self-propelled bimetallic Janus rotor powered by the synergy between a spontaneous electric and ionic current, produced by two coupled redox reactions, and a magnetic field, placed orthogonal to the surface of the device. Such a combination induces a magnetohydrodynamic vortex at each extremity of the rotor arm, which generates an overall driving force able to propel the rotor. Furthermore, the motion of the self-polarized object can be controlled by the direction of the spontaneous electric current or the orientation of the external magnetic field, resulting in a predictable clockwise or anticlockwise motion. In addition, these devices exhibit directional corkscrew-type displacement, when representing their displacement as a function of time, producing time-space specular behavior. The concept can be used to design alternative self-mixing systems for a variety of (micro)fluidic equipment.
Settore CHIM/01 - Chimica Analitica
Settore CHIM/02 - Chimica Fisica
   Cargo-towing Highly enantioselective Electro-pumps: unconventional asymmetrIc Readout and transmission of chiral information (CHEIR)
   CHEIR
   EUROPEAN COMMISSION
   101040798

   Electrochemically induced Asymmetry: from materials to molecules and back
   ELECTRA
   European Commission
   Horizon 2020 Framework Programme
   741251
21-lug-2023
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1030293
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