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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
Published on: November 4, 2021
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Synchronization and self-assembly of free capillary spinners
Nilgun Sungar1, John Sharpe1, Loic Ijzerman1
1California Polytechnic State University, Department of Physics, San Luis Obispo, San Luis Obispo, California 93407, USA.
Physical Review. E
|April 18, 2025
Summary
Chiral active particles, or spinners, self-propel via capillary waves on vibrated fluids. These spinners exhibit quantized assembly, phase synchronization, and collective rotation, demonstrating potential for swarm behavior.
Area of Science:
- Physics
- Soft Matter Physics
- Fluid Dynamics
Background:
- Chiral active particles harness environmental energy for self-propulsion, often through rotation.
- Understanding particle interactions and collective behaviors is crucial in active matter research.
Purpose of the Study:
- To experimentally investigate the rotational self-propulsion and collective behaviors of chiral particles on a vibrated fluid surface.
- To model the wave-mediated interactions governing particle assembly and synchronization.
- To explore the potential for synchronized and swarming behaviors in larger collections of chiral particles.
Main Methods:
- Experimental setup with chiral spinners on a vibrated fluid surface.
- Observation of particle rotation driven by emitted capillary waves.
- Mathematical modeling of wave-mediated interactions for assembly and synchronization.
- Qualitative analysis of global rotations based on wave interference and radiation stress.
Main Results:
- Chiral spinners self-propel through rotation induced by capillary waves.
- Pairs of spinners assemble at quantized distances due to mutual wavefield generation.
- Observed phase synchronization and, in some cases, global rotation around a central point.
- Mathematical model successfully captures key features of assembly and synchronization.
Conclusions:
- Wave-mediated interactions are fundamental to the observed assembly and synchronization of chiral active particles.
- The system demonstrates potential for controlled collective behaviors, including swarming.
- This tabletop experiment offers a platform for studying synchronization and emergent behaviors in active matter.
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