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Liquid Crystal Phases in Suspensions of Charged Plate-Like Particles

Delhorme, Maxime; Labbez, Christophe and Jönsson, Bo LU (2012) In The Journal of Physical Chemistry Letters 3(10). p.1315-1320
Abstract
Anisotropic interactions in colloidal suspensions have recently emerged as a route for the design of new soft materials. Nonisotropic particles can form nematic, smectic, hexatic, and columnar liquid crystals. Although the formation of these phases is well rationalized when excluded volume is solely at play, the role of electrostatic interactions still remains unclear and even less so when particles present a charge heterogeneity, for example, clays. Here, we use Monte Carlo simulations of concentrated suspensions of charged disk-like particles to reveal the role of Coulomb interactions and charge anisotropy underlying liquid crystal formation and structures. We observe a vast zoo of exotic structures, going from hexatic to columnar... (More)
Anisotropic interactions in colloidal suspensions have recently emerged as a route for the design of new soft materials. Nonisotropic particles can form nematic, smectic, hexatic, and columnar liquid crystals. Although the formation of these phases is well rationalized when excluded volume is solely at play, the role of electrostatic interactions still remains unclear and even less so when particles present a charge heterogeneity, for example, clays. Here, we use Monte Carlo simulations of concentrated suspensions of charged disk-like particles to reveal the role of Coulomb interactions and charge anisotropy underlying liquid crystal formation and structures. We observe a vast zoo of exotic structures, going from hexatic to columnar phases, which are shown to be controlled by the charge anisotropy. The particle volume fraction at which these phases start to form is found to decrease with increasing Coulomb interactions and charge anisotropy, which suggests a route to tune the structure of aqueous liquid crystals. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Letters
volume
3
issue
10
pages
1315 - 1320
publisher
The American Chemical Society
external identifiers
  • wos:000304073800015
  • scopus:84862080663
ISSN
1948-7185
DOI
10.1021/jz300380n
language
English
LU publication?
yes
id
c7edc5a3-9fa7-417f-b9ba-8dfd4b03d080 (old id 2812952)
date added to LUP
2012-06-25 09:33:39
date last changed
2017-10-01 04:17:49
@article{c7edc5a3-9fa7-417f-b9ba-8dfd4b03d080,
  abstract     = {Anisotropic interactions in colloidal suspensions have recently emerged as a route for the design of new soft materials. Nonisotropic particles can form nematic, smectic, hexatic, and columnar liquid crystals. Although the formation of these phases is well rationalized when excluded volume is solely at play, the role of electrostatic interactions still remains unclear and even less so when particles present a charge heterogeneity, for example, clays. Here, we use Monte Carlo simulations of concentrated suspensions of charged disk-like particles to reveal the role of Coulomb interactions and charge anisotropy underlying liquid crystal formation and structures. We observe a vast zoo of exotic structures, going from hexatic to columnar phases, which are shown to be controlled by the charge anisotropy. The particle volume fraction at which these phases start to form is found to decrease with increasing Coulomb interactions and charge anisotropy, which suggests a route to tune the structure of aqueous liquid crystals.},
  author       = {Delhorme, Maxime and Labbez, Christophe and Jönsson, Bo},
  issn         = {1948-7185},
  language     = {eng},
  number       = {10},
  pages        = {1315--1320},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Letters},
  title        = {Liquid Crystal Phases in Suspensions of Charged Plate-Like Particles},
  url          = {http://dx.doi.org/10.1021/jz300380n},
  volume       = {3},
  year         = {2012},
}