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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Chemically-Driven Autonomous Janus Electromagnets as Magnetotactic Swimmers.

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  • 1Univ. Bordeaux, CNRS, Bordeaux INP, ISM UMR 5255, 33607, Pessac, France.

Angewandte Chemie (International Ed. in English)
|June 26, 2024
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Chemically driven Janus swimmers create magnetic fields using spontaneous redox reactions. This on-board magnetization enables self-propelled motion without ferromagnetic materials.

Keywords:
Janus swimmersSelf-electrophoresiselectromagnetsmagnetically-driven propulsion

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physics

Background:

  • Electromagnets utilize electrical currents to generate magnetic fields, with solenoids being a common example.
  • Anisotropic Janus swimmers can generate local electric currents via spontaneous redox reactions at their ends, mimicking power sources.

Purpose of the Study:

  • To couple redox reactions at the ends of a hybrid Mg/Pt Janus swimmer with a solenoidal geometry.
  • To generate significant magnetic fields using a chemically driven electromagnet design.

Main Methods:

  • Utilizing spontaneous redox reactions at the extremities of a hybrid Mg/Pt Janus swimmer.
  • Designing the swimmer with a solenoidal geometry to concentrate the magnetic field.
  • Immersing the swimmer in an acidic medium to initiate redox reactions and current generation.

Main Results:

  • The Janus swimmer generated magnetic fields in the microtesla (μT) range.
  • The on-board magnetization enabled compass-like rotational motion and magnetotactic displacement.
  • The swimmer's motion was controlled without relying on ferromagnetic materials.
  • The angular velocity was tunable by altering the solution composition.

Conclusions:

  • Hybrid Mg/Pt Janus swimmers can function as chemically driven electromagnets.
  • This technology allows for self-propelled, magnetically responsive motion in microswimmers.
  • The ability to tune motion via solution composition offers potential for controlled micro-robotics.