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Lorentz Force-Driven Autonomous Janus Swimmers.

Gerardo Salinas1, Kostiantyn Tieriekhov1, Patrick Garrigue1

  • 1Bordeaux INP, ISM, UMR 5255, University of Bordeaux, CNRS, F-33607 Pessac, France.

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Researchers harnessed ion flux and magnetic fields to boost autonomous swimmer speed by 100x. This synergy enables precise control over swimmer trajectory, offering new possibilities for micro- and macroscale applications.

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Area of Science:

  • Physics, Materials Science, Nanotechnology, Chemical Engineering

Background:

  • Autonomous swimmers are crucial for applications in biomedicine and environmental remediation.
  • Existing swimmers rely on self-propulsion or external stimuli for motion.
  • Controlling swimmer speed and trajectory remains a key challenge.

Purpose of the Study:

  • To investigate the synergistic effect of ion flux and magnetic fields on Mg/Pt Janus swimmers.
  • To develop a novel propulsion and control mechanism for autonomous swimmers.
  • To explore the scalability of this effect across different object sizes.

Main Methods:

  • Utilized self-electrophoretic Mg/Pt Janus swimmers.
  • Applied an external magnetic field orthogonal to spontaneous ionic currents.
  • Analyzed the resulting magnetohydrodynamic (MHD) effects and Lorentz forces.
  • Investigated cation flux along swimmer edges for trajectory control.
  • Observed motion at both macro- and microscale.

Main Results:

  • Achieved a speed increase of up to two orders of magnitude for the swimmers.
  • Demonstrated precise control over swimmer trajectory (clockwise/anticlockwise motion) via magnetic field orientation.
  • Confirmed the independence of the propulsion and control mechanism from swimmer size.

Conclusions:

  • The synergy between ion flux and magnetic fields offers an efficient propulsion mechanism for autonomous swimmers.
  • This method provides unprecedented control over swimmer trajectory, independent of size.
  • Opens new avenues for designing advanced micro- and nanorobots for diverse applications.