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Nonequilibrium dynamics of mixtures of active and passive colloidal particles
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Nonequilibrium dynamics of mixtures of active and passive colloidal particles
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Journal Article
Nonequilibrium dynamics of mixtures of active and passive colloidal particles
2017
Overview
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.
Publisher
IOP Publishing
Subject
/ Clusters
/ Condensed Matter Physics (including Material Physics, Nano Physics)
/ Den kondenserade materiens fysik (Här ingår: Materialfysik, nanofysik)
/ Fysik
/ Fysikalisk kemi (Här ingår: Yt- och kolloidkemi)
/ Kemi
/ motility-induced instability
/ particle-resolved simulations
/ Physical Chemistry (including Surface- and Colloid Chemistry)
/ Physics
