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Helical micromotor operating under stationary DC electrostatic field.

Daigo Yamamoto1, Kento Kosugi1, Kazuya Hiramatsu1

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Researchers developed simple direct current (DC) micromotors using microhelices. These micromotors exhibit unique cork-screw rotation without mechanical support, offering potential in microrobotics and microfluidics.

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Area of Science:

  • Physics
  • Materials Science
  • Nanotechnology

Background:

  • Direct current (DC) motors convert electrical energy to mechanical energy.
  • Downsizing conventional DC motors (macromotors) to microscale (micromotors) is challenging due to viscous effects.
  • Previous work showed non-spherical particles exhibit motion in ionic surfactant solutions.

Purpose of the Study:

  • To report simple DC micromotors operating on a novel principle.
  • To investigate the motion of microhelices in an ionic surfactant oil phase.
  • To demonstrate controllable rotational motion for micro-devices.

Main Methods:

  • Utilizing microhelices (metal and organic) in an ionic surfactant oil phase.
  • Applying a stationary constant DC voltage.
  • Observing and analyzing the resulting periodic motion, specifically cork-screw rotation.
  • Investigating the effect of helix handedness (chirality) on rotation direction.

Main Results:

  • Microhelices exhibit a new periodic motion: cork-screw-type rotation.
  • Rotation direction depends on helix material (e.g., nickel vs. organic).
  • Left-handed nickel helix rotates clockwise; organic helix rotates anti-clockwise under DC voltage.
  • Rotation direction is reversible by changing helix chirality.
  • Micromotors operate stably without mechanical support or electronic switching.

Conclusions:

  • A new principle for simple DC micromotors based on microhelix rotation has been demonstrated.
  • The direction of rotation is controllable via material choice and chirality.
  • These self-supported micromotors are promising for applications in microrobots and microfluidic devices.