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Transition from Linear to Circular Motion in Active Spherical-Cap Colloids.

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Active spherical-cap particles transition from linear to circular motion. Changing hydrogen peroxide concentration controls particle movement near a substrate, demonstrating tunable active matter behavior.

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Area of Science:

  • Colloid and Surface Science
  • Active Matter Physics
  • Nanotechnology

Background:

  • Nonspherical colloidal particles enable diverse active motions.
  • Self-diffusiophoresis is a key mechanism for self-propulsion.
  • Particle shape and chemical environment influence motion dynamics.

Purpose of the Study:

  • Investigate the transition from linear to circular motion in active spherical-cap particles.
  • Explore the effect of fuel concentration on particle trajectory.
  • Understand the role of particle orientation near a substrate.

Main Methods:

  • Utilized spherical-cap particles with catalytic sites for hydrogen peroxide decomposition.
  • Induced self-propulsion via self-diffusiophoresis.
  • Varied hydrogen peroxide concentration to observe motion changes.
  • Analyzed particle motion near a substrate.

Main Results:

  • Observed a transition from linear to circular motion with increasing hydrogen peroxide concentration.
  • Demonstrated that particle motion depends on orientation relative to the substrate.
  • Found self-propulsion speed to be largely independent of particle size.

Conclusions:

  • Nonspherical particles can exhibit tunable linear and circular active motion.
  • Fuel concentration is a critical parameter for controlling active particle trajectories.
  • This work provides insights into designing active colloidal systems with specific motion patterns.