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Interrupted Motility Induced Phase Separation in Aligning Active Colloids.

Marjolein N van der Linden1,2, Lachlan C Alexander2, Dirk G A L Aarts2

  • 1Gulliver UMR CNRS 7083, ESPCI Paris, PSL Research University, 10 rue Vauquelin, 75005 Paris, France.

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|September 17, 2019
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Summary
This summary is machine-generated.

Active Janus colloids rapidly cluster and aggregate, but full phase separation is interrupted by cluster breakup. Particle alignment, not just repulsion, drives this interruption, revealing new physics in active matter systems.

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Area of Science:

  • Colloid science
  • Active matter physics
  • Soft condensed matter

Background:

  • Active Janus colloids exhibit complex self-assembly behaviors.
  • Phase separation is a fundamental process in many materials.

Purpose of the Study:

  • Investigate the dynamics and mechanisms of phase separation in active Janus colloids.
  • Understand the role of particle alignment in interrupting phase separation.

Main Methods:

  • Simulating a dense system of active Janus colloids.
  • Tracking particle positions and orientations over time.
  • Analyzing cluster size distribution and structural ordering.

Main Results:

  • Observed fast clustering followed by aggregation, then interruption by cluster breakup.
  • Identified three distinct dynamical regimes during phase separation.
  • Demonstrated that particle alignment is crucial for interrupting full phase separation.

Conclusions:

  • Active Janus colloids display complex phase separation dynamics influenced by alignment.
  • The interplay of alignment and short-range repulsion introduces new physics in active matter.
  • Findings advance the understanding of self-assembly and phase transitions in active systems.