Active colloidal suspensions: Clustering and phase behavior

Abstract We review recent experimental, numerical, and analytical results on active suspensions of self-propelled colloidal beads moving in (quasi-)two dimensions. Active colloids form part of the larger theme of active matter , which is noted for the emergence of collective dynamic phenomena away from thermal equilibrium. Both in experiments and computer simulations, a separation into dense aggregates, i.e., clusters, and a dilute gas phase has been reported even when attractive interactions and an alignment mechanism are absent. Here, we describe three experimental setups, discuss the different propelling mechanisms, and summarize the evidence for phase separation. We then compare experimental observations with numerical studies based on a minimal model of colloidal swimmers. Finally, we review a mean-field approach derived from first principles, which provides a theoretical framework for the density instability causing the phase separation in active colloids.

• Publication year

  2014

• Venue

  Journal of Non-crystalline Solids

• Publication date

  2014-07-25

• Fields of study

  Materials Science, Physics, Chemistry

• Identifiers
  DOI 10.1016/j.jnoncrysol.2014.08.011arXiv 1407.6828
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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