Activity-induced phase separation and self-assembly in mixtures of active and passive particles.

We investigate the phase behavior and kinetics of a monodisperse mixture of active (i.e., self-propelled) and passive isometric Brownian particles through Brownian dynamics simulations and theory. As in a purely active system, motility of the active component triggers phase separation into a dense and a dilute phase; in the dense phase, we further find active-passive segregation, with "rafts" of passive particles in a "sea" of active particles. We find that phase separation from an initially disordered mixture can occur with as little as 15% of the particles being active. Finally, we show that a system prepared in a suitable fully segregated initial state reproducibly self-assembles an active "corona," which triggers crystallization of the passive core by initiating a compression wave. Our findings are relevant to the experimental pursuit of directed self-assembly using active particles.

• Publication year

  2014

• Venue

  Physical Review Letters

• Publication date

  2014-08-21

• Fields of study

  Materials Science, Physics, Chemistry, Medicine

• Identifiers
  DOI 10.1103/PhysRevLett.114.018301arXiv 1408.5175PMID 25615509
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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