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Effective interactions between soft-repulsive colloids: Experiments, theory, and simulations.

Mohanty, Priti LU ; Paloli, Divya LU ; Crassous, Jerome LU ; Zaccarelli, Emanuela and Schurtenberger, Peter LU (2014) In Journal of Chemical Physics 140(9).
Abstract
We describe a combined experimental, theoretical, and simulation study of the structural correlations between cross-linked highly monodisperse and swollen Poly(N-isopropylacrylamide) microgel dispersions in the fluid phase in order to obtain the effective pair-interaction potential between the microgels. The density-dependent experimental pair distribution functions g(r)'s are deduced from real space studies using fluorescent confocal microscopy and compared with integral equation theory and molecular dynamics computer simulations. We use a model of Hertzian spheres that is capable to well reproduce the experimental pair distribution functions throughout the fluid phase, having fixed the particle size and the repulsive strength.... (More)
We describe a combined experimental, theoretical, and simulation study of the structural correlations between cross-linked highly monodisperse and swollen Poly(N-isopropylacrylamide) microgel dispersions in the fluid phase in order to obtain the effective pair-interaction potential between the microgels. The density-dependent experimental pair distribution functions g(r)'s are deduced from real space studies using fluorescent confocal microscopy and compared with integral equation theory and molecular dynamics computer simulations. We use a model of Hertzian spheres that is capable to well reproduce the experimental pair distribution functions throughout the fluid phase, having fixed the particle size and the repulsive strength. Theoretically, a monodisperse system is considered whose properties are calculated within the Rogers-Young closure relation, while in the simulations the role of polydispersity is taken into account. We also discuss the various effects arising from the finite resolution of the microscope and from the noise coming from the fast Brownian motion of the particles at low densities, and compare the information content from data taken in 2D and 3D through a comparison with the corresponding simulations. Finally different potential shapes, recently adopted in studies of microgels, are also taken into account to assess which ones could also be used to describe the structure of the microgel fluid. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Chemical Physics
volume
140
issue
9
publisher
American Institute of Physics
external identifiers
  • pmid:24606376
  • wos:000334067400034
  • scopus:84896780823
ISSN
0021-9606
DOI
10.1063/1.4866644
language
English
LU publication?
yes
id
4cdf66c3-3587-4590-baf7-21767fdb3f0c (old id 4383721)
date added to LUP
2014-05-07 17:01:59
date last changed
2017-10-01 03:06:27
@article{4cdf66c3-3587-4590-baf7-21767fdb3f0c,
  abstract     = {We describe a combined experimental, theoretical, and simulation study of the structural correlations between cross-linked highly monodisperse and swollen Poly(N-isopropylacrylamide) microgel dispersions in the fluid phase in order to obtain the effective pair-interaction potential between the microgels. The density-dependent experimental pair distribution functions g(r)'s are deduced from real space studies using fluorescent confocal microscopy and compared with integral equation theory and molecular dynamics computer simulations. We use a model of Hertzian spheres that is capable to well reproduce the experimental pair distribution functions throughout the fluid phase, having fixed the particle size and the repulsive strength. Theoretically, a monodisperse system is considered whose properties are calculated within the Rogers-Young closure relation, while in the simulations the role of polydispersity is taken into account. We also discuss the various effects arising from the finite resolution of the microscope and from the noise coming from the fast Brownian motion of the particles at low densities, and compare the information content from data taken in 2D and 3D through a comparison with the corresponding simulations. Finally different potential shapes, recently adopted in studies of microgels, are also taken into account to assess which ones could also be used to describe the structure of the microgel fluid.},
  articleno    = {094901},
  author       = {Mohanty, Priti and Paloli, Divya and Crassous, Jerome and Zaccarelli, Emanuela and Schurtenberger, Peter},
  issn         = {0021-9606},
  language     = {eng},
  number       = {9},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Effective interactions between soft-repulsive colloids: Experiments, theory, and simulations.},
  url          = {http://dx.doi.org/10.1063/1.4866644},
  volume       = {140},
  year         = {2014},
}