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Fluid-solid transitions in soft-repulsive colloids

Paloli, Divya LU ; Mohanty, Priti LU ; Crassous, Jerome LU ; Zaccarelli, Emanuela and Schurtenberger, Peter LU (2013) In Soft Matter 9(11). p.3000-3004
Abstract
We use monodisperse poly(N-isopropylacrylamide) (PNIPAM) microgels as a model system for soft repulsive colloids and study their density dependent structural ordering and phase behaviour using confocal laser scanning microscopy (CLSM). The experiments are carried out at low temperatures, where the particles are in the swollen state and interact via a Hertzian potential, evidenced through a quantitative comparison of the pair correlation functions g(r) obtained with CLSM and computer simulations. We worked over a broad range of effective volume fractions phi(eff) below and above close packing (phi(cp)). CLSM allows us to identify a fluid-glass and a fluid-crystal transition by looking at the structure and dynamics of the suspensions. The... (More)
We use monodisperse poly(N-isopropylacrylamide) (PNIPAM) microgels as a model system for soft repulsive colloids and study their density dependent structural ordering and phase behaviour using confocal laser scanning microscopy (CLSM). The experiments are carried out at low temperatures, where the particles are in the swollen state and interact via a Hertzian potential, evidenced through a quantitative comparison of the pair correlation functions g(r) obtained with CLSM and computer simulations. We worked over a broad range of effective volume fractions phi(eff) below and above close packing (phi(cp)). CLSM allows us to identify a fluid-glass and a fluid-crystal transition by looking at the structure and dynamics of the suspensions. The density dependent g(r) values exhibit clearly visible anomalies at high phi(eff) > phi(cp) which we interpret as a structural signature of the glass transition related to the particle softness. These results are discussed in light of the previously studied phase behaviour of colloidal systems interacting with hard and soft repulsive interaction potentials. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
9
issue
11
pages
3000 - 3004
publisher
Royal Society of Chemistry
external identifiers
  • wos:000315168300002
  • scopus:84875864233
ISSN
1744-6848
DOI
10.1039/c2sm27654b
language
English
LU publication?
yes
id
288b350b-a383-4998-bc0b-811014c87576 (old id 3674809)
date added to LUP
2016-04-01 14:55:05
date last changed
2020-09-13 05:23:53
@article{288b350b-a383-4998-bc0b-811014c87576,
  abstract     = {We use monodisperse poly(N-isopropylacrylamide) (PNIPAM) microgels as a model system for soft repulsive colloids and study their density dependent structural ordering and phase behaviour using confocal laser scanning microscopy (CLSM). The experiments are carried out at low temperatures, where the particles are in the swollen state and interact via a Hertzian potential, evidenced through a quantitative comparison of the pair correlation functions g(r) obtained with CLSM and computer simulations. We worked over a broad range of effective volume fractions phi(eff) below and above close packing (phi(cp)). CLSM allows us to identify a fluid-glass and a fluid-crystal transition by looking at the structure and dynamics of the suspensions. The density dependent g(r) values exhibit clearly visible anomalies at high phi(eff) > phi(cp) which we interpret as a structural signature of the glass transition related to the particle softness. These results are discussed in light of the previously studied phase behaviour of colloidal systems interacting with hard and soft repulsive interaction potentials.},
  author       = {Paloli, Divya and Mohanty, Priti and Crassous, Jerome and Zaccarelli, Emanuela and Schurtenberger, Peter},
  issn         = {1744-6848},
  language     = {eng},
  number       = {11},
  pages        = {3000--3004},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Fluid-solid transitions in soft-repulsive colloids},
  url          = {http://dx.doi.org/10.1039/c2sm27654b},
  doi          = {10.1039/c2sm27654b},
  volume       = {9},
  year         = {2013},
}