Nonequilibrium dynamics of mixtures of active and passive colloidal particles
(2017) In New Journal of Physics 19(10).- Abstract
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... (More)
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.
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- author
- Wittkowski, Raphael ; Stenhammar, Joakim LU and Cates, Michael E.
- organization
- publishing date
- 2017-10-04
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- active colloidal particles, active-passive mixtures, mesoscopic field theory particle-resolved simulations, motility-induced instability
- in
- New Journal of Physics
- volume
- 19
- issue
- 10
- article number
- 105003
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85032800474
- wos:000412283200001
- ISSN
- 1367-2630
- DOI
- 10.1088/1367-2630/aa8195
- language
- English
- LU publication?
- yes
- id
- 2f4ae211-5acb-4669-bc2c-74971250f919
- date added to LUP
- 2017-11-15 08:26:19
- date last changed
- 2024-03-31 18:33:51
@article{2f4ae211-5acb-4669-bc2c-74971250f919,
abstract = {{<p>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.</p>}},
author = {{Wittkowski, Raphael and Stenhammar, Joakim and Cates, Michael E.}},
issn = {{1367-2630}},
keywords = {{active colloidal particles; active-passive mixtures; mesoscopic field theory particle-resolved simulations; motility-induced instability}},
language = {{eng}},
month = {{10}},
number = {{10}},
publisher = {{IOP Publishing}},
series = {{New Journal of Physics}},
title = {{Nonequilibrium dynamics of mixtures of active and passive colloidal particles}},
url = {{http://dx.doi.org/10.1088/1367-2630/aa8195}},
doi = {{10.1088/1367-2630/aa8195}},
volume = {{19}},
year = {{2017}},
}