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Preparation and 3D Tracking of Catalytic Swimming Devices
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Optimal motion of triangular magnetocapillary swimmers.

Alexander Sukhov1, Sebastian Ziegler2, Qingguang Xie3

  • 1Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Fürther Straße 248, 90429 Nürnberg, Germany.

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This study numerically investigates magnetocapillary swimmers, revealing optimal magnetic field frequencies for controlled motion. Particle spacing affects speed, with larger distances reducing maximum velocity.

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Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Computational physics

Background:

  • Magnetocapillary swimmers are microscale devices utilizing magnetic fields and fluid interfaces for propulsion.
  • Understanding their motion is crucial for micro-robotics and targeted delivery applications.

Purpose of the Study:

  • To numerically investigate the controlled motion of magnetocapillary swimmers composed of ferromagnetic particles.
  • To determine the relationship between magnetic field frequency and swimmer speed.
  • To analyze the effect of interparticle distance on swimmer performance.

Main Methods:

  • Hybrid numerical method combining pseudopotential lattice Boltzmann method and discrete element method.
  • Simulation of equilibrium properties for single, two, and three particles at a liquid-liquid interface.
  • Analysis of controlled motion for a three-particle swimmer under time-dependent magnetic fields.

Main Results:

  • Demonstrated controlled motion of a three-particle magnetocapillary swimmer.
  • Observed a sharp dependence of average center-of-mass speed on magnetic field frequency.
  • Identified optimal frequencies related to particle relaxation time, with speed maxima.
  • Found that increasing interparticle distance reduces maximum average speed.

Conclusions:

  • The study provides insights into the dynamics of magnetocapillary swimmers.
  • Optimal magnetic field frequencies are critical for efficient swimmer propulsion.
  • Interparticle spacing is a key parameter influencing swimmer speed and performance.