Effective interactions in active Brownian suspensions.
- Farage TF Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland.
- Krinninger P Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, D-95440 Bayreuth, Germany.
- Brader JM Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland.
- 2015-05-15
Published in:
- Physical review. E, Statistical, nonlinear, and soft matter physics. - 2015
English
Active colloids exhibit persistent motion, which can lead to motility-induced phase separation (MIPS). However, there currently exists no microscopic theory to account for this phenomenon. We report a first-principles theory, free of fit parameters, for active spherical colloids, which shows explicitly how an effective many-body interaction potential is generated by activity and how this can rationalize MIPS. For a passively repulsive system the theory predicts phase separation and pair correlations in quantitative agreement with simulation. For an attractive system the theory shows that phase separation becomes suppressed by moderate activity, consistent with recent experiments and simulations, and suggests a mechanism for reentrant cluster formation at high activity.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevE.91.042310
- PMID 25974494
- Persistent URL
- https://sonar.ch/global/documents/2163
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