TY  - JOUR
AB  - 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.
AU  - Wittkowski, Raphael
AU  - Stenhammar, Joakim
AU  - Cates, Michael E.
DA  - 2017-10-04
DO  - 10.1088/1367-2630/aa8195
KW  - active colloidal particles
KW  - active-passive mixtures
KW  - motility-induced instability
KW  - mesoscopic field theory
particle-resolved simulations
LA  - eng
N1  - New Journal of Physics 19 (2017) 105003, 1-16
N1  - Finanziert durch den Open-Access-Publikationsfonds 2017 der Westfälischen Wilhelms-Universität Münster (WWU Münster).
PY  - 2017-10-04
TI  - Nonequilibrium dynamics of mixtures of active and passive colloidal particles
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:6-85169510228
Y2  - 2024-11-22T04:18:08
ER  -