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The extended law of corresponding states when attractions meet repulsions

Van Gruijthuijsen, K.; Obiols-Rabasa, M. LU ; Schurtenberger, P. LU ; Bouwman, W. G. and Stradner, A. LU (2018) In Soft Matter 14(19). p.3704-3715
Abstract

Short-range attractive colloids show well-defined phase behaviour in the absence of repulsions, and highly intriguing equilibrium gelation in the presence of long-range repulsions. We present the state diagram of short-range attractive colloids with repulsions that range from fully screened to intermediately ranged, i.e. longer-ranged than the attractions, but shorter ranged than the colloid size. We demonstrate that although the macroscopic phase behaviour does not change perceptibly, there is a dramatic increase of inhomogeneities once the repulsions become longer-ranged than the attractions. The interaction potentials are characterized with small angle neutron scattering, and used to renormalize the state diagram with the minimum in... (More)

Short-range attractive colloids show well-defined phase behaviour in the absence of repulsions, and highly intriguing equilibrium gelation in the presence of long-range repulsions. We present the state diagram of short-range attractive colloids with repulsions that range from fully screened to intermediately ranged, i.e. longer-ranged than the attractions, but shorter ranged than the colloid size. We demonstrate that although the macroscopic phase behaviour does not change perceptibly, there is a dramatic increase of inhomogeneities once the repulsions become longer-ranged than the attractions. The interaction potentials are characterized with small angle neutron scattering, and used to renormalize the state diagram with the minimum in the interaction potential, min[U(r)], and with the reduced second virial coefficient, B2∗. We find that the extended law of corresponding states captures the onset of phase separation for shorter ranged repulsions, but fails for longer ranged repulsions. Instead, for a given model of U(r), the transition from visually homogeneous fluid to phase separation and/or gelation can be rescaled with min[U(r)] over the full range of repulsions. Finally, we suggest a generic state diagram to describe the effect of repulsions on short-range attractive systems.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
14
issue
19
pages
12 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85047270076
ISSN
1744-683X
DOI
10.1039/c8sm00160j
language
English
LU publication?
yes
id
579fead7-a1e7-42b5-921a-c6dbb0bda0e8
date added to LUP
2018-06-04 09:34:30
date last changed
2019-02-20 11:18:52
@article{579fead7-a1e7-42b5-921a-c6dbb0bda0e8,
  abstract     = {<p>Short-range attractive colloids show well-defined phase behaviour in the absence of repulsions, and highly intriguing equilibrium gelation in the presence of long-range repulsions. We present the state diagram of short-range attractive colloids with repulsions that range from fully screened to intermediately ranged, i.e. longer-ranged than the attractions, but shorter ranged than the colloid size. We demonstrate that although the macroscopic phase behaviour does not change perceptibly, there is a dramatic increase of inhomogeneities once the repulsions become longer-ranged than the attractions. The interaction potentials are characterized with small angle neutron scattering, and used to renormalize the state diagram with the minimum in the interaction potential, min[U(r)], and with the reduced second virial coefficient, B<sub>2</sub>∗. We find that the extended law of corresponding states captures the onset of phase separation for shorter ranged repulsions, but fails for longer ranged repulsions. Instead, for a given model of U(r), the transition from visually homogeneous fluid to phase separation and/or gelation can be rescaled with min[U(r)] over the full range of repulsions. Finally, we suggest a generic state diagram to describe the effect of repulsions on short-range attractive systems.</p>},
  author       = {Van Gruijthuijsen, K. and Obiols-Rabasa, M. and Schurtenberger, P. and Bouwman, W. G. and Stradner, A.},
  issn         = {1744-683X},
  language     = {eng},
  month        = {01},
  number       = {19},
  pages        = {3704--3715},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {The extended law of corresponding states when attractions meet repulsions},
  url          = {http://dx.doi.org/10.1039/c8sm00160j},
  volume       = {14},
  year         = {2018},
}