Aggregation and sedimentation of active Brownian particles at constant affinity

Abstract

We study the motility-induced phase separation of active particles driven through the interconversion of two chemical species controlled by ideal reservoirs (chemostats). 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.

Autoren

Andreas Fischer
Arkya Chatterjee
Thomas Speck

DOI

10.1063/1.5081115

eISSN

1089-7690

ISSN

0021-9606

Ausgabe der Veröffentlichung

6

Zeitschrift

The Journal of Chemical Physics

Sprache

en

Online publication date

2019

Datum der Veröffentlichung

2019

Status

Published

Herausgeber

AIP Publishing

Herausgeber URL

http://dx.doi.org/10.1063/1.5081115

Datum der Datenerfassung

2023

Titel

Aggregation and sedimentation of active Brownian particles at constant affinity

Ausgabe der Zeitschrift

150

Datenquelle: Crossref

Abstract

We study the motility-induced phase separation of active particles driven through the interconversion of two chemical species controlled by ideal reservoirs (chemostats). 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.

Addresses

Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7-9, 55128 Mainz, Germany.

Autoren

Andreas Fischer
Arkya Chatterjee
Thomas Speck

DOI

10.1063/1.5081115

eISSN

1089-7690

Externe Identifier

PubMed Identifier: 30769983

Funding acknowledgements

Deutscher Akademischer Austauschdienst: WISE
Deutsche Forschungsgemeinschaft: SP 1382/3-2
Deutsche Forschungsgemeinschaft: GSC 266

Open access

false

ISSN

0021-9606

Ausgabe der Veröffentlichung

6

Zeitschrift

The Journal of chemical physics

Sprache

eng

Medium

Print

Paginierung

064910

Datum der Veröffentlichung

2019

Status

Published

Datum der Datenerfassung

2019

Titel

Aggregation and sedimentation of active Brownian particles at constant affinity.

Sub types

Journal Article

Ausgabe der Zeitschrift

150

Datenquelle: Europe PubMed Central

Abstract

We study the motility-induced phase separation of active particles driven through the interconversion of two chemical species controlled by ideal reservoirs (chemostats). 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.

Autoren

Andreas Fischer
Arkya Chatterjee
Thomas Speck

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/30769983

DOI

10.1063/1.5081115

eISSN

1089-7690

Ausgabe der Veröffentlichung

6

Zeitschrift

J Chem Phys

Sprache

eng

Country

United States

Paginierung

064910

Datum der Veröffentlichung

2019

Status

Published

Datum, an dem der Datensatz öffentlich gemacht wurde

2019

Titel

Aggregation and sedimentation of active Brownian particles at constant affinity.

Sub types

Journal Article

Ausgabe der Zeitschrift

150

Datenquelle: PubMed

Abstract

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.

Autoren

Andreas Fischer
Arkya Chatterjee
Thomas Speck

Autoren-URL

http://arxiv.org/abs/1811.05746v1

Zeitschrift

J. Chem. Phys.

Schlüsselwörter

cond-mat.stat-mech
cond-mat.stat-mech

Paginierung

064910

Datum der Veröffentlichung

2018

Herausgeber URL

http://dx.doi.org/10.1063/1.5081115

Datum der Datenerfassung

2018

Datum, an dem der Datensatz öffentlich gemacht wurde

2018

Titel

Aggregation and sedimentation of active Brownian particles at constant affinity

Ausgabe der Zeitschrift

150

Files

1811.05746v1.pdf

Datenquelle: arXiv

Aggregation and sedimentation of active Brownian particles at constant affinity

Files

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