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Jean-Baptiste Gorce1, Konstantin Y Bliokh2, Hua Xia1

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Fast-spinning magnetic particles create self-propelled "spinner-vortex" quasiparticles on liquid surfaces. These novel entities are guided by boundaries, offering new possibilities for micro-robotics and fluid manipulation.

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Area of Science:

  • Physics of complex fluids
  • Soft matter physics
  • Micro-robotics and active matter

Background:

  • Angular momentum in spinning bodies drives interactions with various media.
  • Nontrivial rotational dynamics are observed across scales, from celestial bodies to quantum particles.
  • Controlled manipulation of small objects in fluids remains a significant challenge.

Purpose of the Study:

  • To investigate the self-guided propulsion of fast-spinning magnetic particles on a liquid surface.
  • To explore the formation and dynamics of composite 'spinner-vortex' quasiparticles.
  • To understand the role of boundaries in guiding particle motion and to assess potential applications.

Main Methods:

  • Experimental observation of magnetic particles spinning on a liquid surface near a solid boundary.
  • Analysis of vortex formation above a critical spinning frequency.
  • Characterization of particle-vortex interactions and propulsion dynamics.

Main Results:

  • Fast-spinning magnetic particles generate localized 3D vortices, forming robust 'spinner-vortex' quasiparticles.
  • These quasiparticles exhibit self-guided propulsion along solid boundaries, mimicking 'liquid wheels'.
  • Propulsion velocity and wall proximity are tunable via angular velocity, controlled by Magnus and wall repulsion forces.

Conclusions:

  • Demonstrated a novel self-propulsion mechanism for spinning particles in fluids.
  • Introduced 'spinner-vortex' quasiparticles with predictable boundary-guided dynamics.
  • Proposed potential applications in surface vehicles and advanced fluid manipulation tools.