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.
(Less)
- author
- Van Gruijthuijsen, K.
; Obiols-Rabasa, M.
LU
; Schurtenberger, P.
LU
; Bouwman, W. G.
and Stradner, A.
LU
- organization
- publishing date
- 2018-01-01
- 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
- 2022-03-09 19:03:01
@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}},
doi = {{10.1039/c8sm00160j}},
volume = {{14}},
year = {{2018}},
}