6533b856fe1ef96bd12b30e9
RESEARCH PRODUCT
Aggregation and sedimentation of active Brownian particles at constant affinity.
Andreas FischerThomas SpeckArkya Chatterjeesubject
Collective behaviorMaterials scienceStatistical Mechanics (cond-mat.stat-mech)010304 chemical physicsFOS: Physical sciencesGeneral Physics and AstronomyObservablePropulsionSedimentation010402 general chemistry01 natural sciences0104 chemical sciencesChemical speciesChemical physics0103 physical sciencesPhysical and Theoretical ChemistryConstant (mathematics)Condensed Matter - Statistical MechanicsBrownian motionPositive feedbackdescription
We study the motility-induced phase separation of active particles driven through the interconversion of two chemical species controlled by ideal reservoirs (chemiostats). As a consequence, the propulsion speed is non-constant and depends on the actual inter-particle forces, enhancing the positive feedback between increased density and reduced motility that is responsible for the observed inhomogeneous density. For hard discs, we find that this effect is negligible and that the phase separation is controlled by the average propulsion speed. For soft particles and large propulsion speeds, however, we predict an observable impact on the collective behavior. We briefly comment on the reentrant behavior found for soft discs. Finally, we study the influence of non-constant propulsion on the sedimentation profile of non-interacting active particles.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-02-17 | The Journal of chemical physics |