Nonequilibrium dynamics of mixtures of active and passive colloidal particles
We develop a mesoscopic field theory for the collective nonequilibrium dynamics of multicomponent mixtures of interacting active (i.e., motile) and passive (i.e., nonmotile) colloidal particles with isometric shape in two spatial dimensions. By a stability analysis of the field theory, we obtain equ...
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Dokumenttypen: | Artikel |
Medientypen: | Text |
Erscheinungsdatum: | 2017 |
Publikation in MIAMI: | 07.03.2019 |
Datum der letzten Änderung: | 05.01.2023 |
Angaben zur Ausgabe: | [Electronic ed.] |
Schlagwörter: | active colloidal particles; active-passive mixtures; motility-induced instability; mesoscopic field theory particle-resolved simulations |
Fachgebiet (DDC): | 530: Physik |
Lizenz: | CC BY 3.0 |
Sprache: | English |
Anmerkungen: | New Journal of Physics 19 (2017) 105003, 1-16 |
Förderung: | Finanziert durch den Open-Access-Publikationsfonds 2017 der Westfälischen Wilhelms-Universität Münster (WWU Münster). |
Format: | PDF-Dokument |
URN: | urn:nbn:de:hbz:6-85169510228 |
Weitere Identifikatoren: | DOI: 10.1088/1367-2630/aa8195 |
Permalink: | https://nbn-resolving.de/urn:nbn:de:hbz:6-85169510228 |
Onlinezugriff: | artikel_wittkowski_2017.pdf |
We develop a mesoscopic field theory for the collective nonequilibrium dynamics of multicomponent mixtures of interacting active (i.e., motile) and passive (i.e., nonmotile) colloidal particles with isometric shape in two spatial dimensions. By a stability analysis of the field theory, we obtain equations for the spinodal that describes the onset of a motility-induced instability leading to cluster formation in such mixtures. The prediction for the spinodal is found to be in good agreement with particle-resolved computer simulations. Furthermore, we show that in active-passive mixtures the spinodal instability can be of two different types. One type is associated with a stationary bifurcation and occurs also in one-component active systems, whereas the other type is associated with a Hopf bifurcation and can occur only in active-passive mixtures. Remarkably, the Hopf bifurcation leads to moving clusters. This explains recent results from simulations of active-passive particle mixtures, where moving clusters and interfaces that are not seen in the corresponding one-component systems have been observed.