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Separation of Mixtures via Precipitation
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Simultaneous phase separation and pattern formation in chiral active mixtures.

Demian Levis1,2,3, Benno Liebchen4

  • 1CECAM Centre Européen de Calcul Atomique et Moléculaire, École Polytechnique Fédérale de Lausanne, Batochime, Avenue Forel 2, 1015 Lausanne, Switzerland.

Physical Review. E
|September 11, 2019
PubMed
Summary
This summary is machine-generated.

Mixtures of chiral active particles with differing frequencies exhibit complex superstructures. One species forms microflocks while another phase separates into macroclusters and gas.

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Area of Science:

  • Soft Matter Physics
  • Active Matter
  • Statistical Mechanics

Background:

  • Chiral active particles, or self-propelled circle swimmers, exhibit unique pattern formation distinct from linear swimmers.
  • Previous studies primarily focused on identical circle swimmers, overlooking the prevalence of frequency distributions in real-world systems.

Purpose of the Study:

  • To investigate the complex superstructures arising from mixtures of circle swimmers with differing frequencies.
  • To explore how variations in particle frequency and swimming speed influence emergent patterns.

Main Methods:

  • Theoretical modeling and/or numerical simulations of binary mixtures of velocity-aligning circle swimmers.
  • Analysis of phase separation, pattern formation, and characteristic length scales in heterogeneous active particle systems.

Main Results:

  • A mixture of two circle swimmer species with different frequencies can lead to novel superstructures.
  • One notable pattern involves one species forming microflocks while the other undergoes macrophase separation into a cluster and gas phase.
  • Another observed pattern in isotropic systems displays two distinct characteristic length scales, tunable by particle frequency and speed.

Conclusions:

  • Heterogeneity in chiral active particles, specifically frequency distribution, significantly enriches their emergent collective behaviors.
  • The study reveals controllable pattern formation with distinct length scales and densities in mixtures of circle swimmers.