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Activity-Induced Phase Separation and Self-Assembly in Mixtures of Active and Passive Particles

Stenhammar, Joakim LU ; Wittkowski, Raphael; Marenduzzo, Davide and Cates, Michael E. (2015) In Physical Review Letters 114(Online 6 January 2015).
Abstract
We investigate the phase behavior and kinetics of a monodisperse mixture of active (i.e., self-propelled) and passive isometric Brownian particles through Brownian dynamics simulations and theory. As in a purely active system, motility of the active component triggers phase separation into a dense and a dilute phase; in the dense phase we further find active-passive segregation, with "rafts" of passive particles in a "sea" of active particles. We find that phase separation from an initially disordered mixture can occur with as little as 15 percent of the particles being active. Finally, we show that a system prepared in a suitable fully segregated initial state reproducibly self-assembles an active "corona" which triggers crystallization... (More)
We investigate the phase behavior and kinetics of a monodisperse mixture of active (i.e., self-propelled) and passive isometric Brownian particles through Brownian dynamics simulations and theory. As in a purely active system, motility of the active component triggers phase separation into a dense and a dilute phase; in the dense phase we further find active-passive segregation, with "rafts" of passive particles in a "sea" of active particles. We find that phase separation from an initially disordered mixture can occur with as little as 15 percent of the particles being active. Finally, we show that a system prepared in a suitable fully segregated initial state reproducibly self-assembles an active "corona" which triggers crystallization of the passive core by initiating a compression wave. Our findings are relevant to the experimental pursuit of directed self-assembly using active particles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
114
issue
Online 6 January 2015
publisher
American Physical Society
external identifiers
  • scopus:84921033865
ISSN
1079-7114
DOI
10.1103/PhysRevLett.114.018301
language
English
LU publication?
yes
id
e3367f98-3e2e-45f6-b838-d0bd00e39304 (old id 4924658)
alternative location
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.018301
date added to LUP
2015-01-20 13:32:13
date last changed
2017-11-19 03:19:39
@article{e3367f98-3e2e-45f6-b838-d0bd00e39304,
  abstract     = {We investigate the phase behavior and kinetics of a monodisperse mixture of active (i.e., self-propelled) and passive isometric Brownian particles through Brownian dynamics simulations and theory. As in a purely active system, motility of the active component triggers phase separation into a dense and a dilute phase; in the dense phase we further find active-passive segregation, with "rafts" of passive particles in a "sea" of active particles. We find that phase separation from an initially disordered mixture can occur with as little as 15 percent of the particles being active. Finally, we show that a system prepared in a suitable fully segregated initial state reproducibly self-assembles an active "corona" which triggers crystallization of the passive core by initiating a compression wave. Our findings are relevant to the experimental pursuit of directed self-assembly using active particles.},
  articleno    = {018301},
  author       = {Stenhammar, Joakim and Wittkowski, Raphael and Marenduzzo, Davide and Cates, Michael E.},
  issn         = {1079-7114},
  language     = {eng},
  number       = {Online 6 January 2015},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Activity-Induced Phase Separation and Self-Assembly in Mixtures of Active and Passive Particles},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.114.018301},
  volume       = {114},
  year         = {2015},
}