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Repulsion between oppositely charged surfaces in multivalent electrolytes

Trulsson, Martin LU orcid ; Jönsson, Bo LU ; Åkesson, Torbjörn LU ; Forsman, Jan LU and Labbez, Christophe (2006) In Physical Review Letters 97(6).
Abstract
In answer to recent experimental force measurements between oppositely charged surfaces we here reproduce the repulsion in the presence of multivalent salt using Monte Carlo simulations within the primitive model. Our osmotic pressure curves are in good agreement with experimental results. In contrast with Poisson-Boltzmann calculations, both repulsion and charge inversion are seen in the simulations. Repulsion is observed only for conditions under which there is charge inversion at large separations. However, in these cases, the repulsion is present also at intermediate separations, where there is no charge inversion. The charge inversion is thereby not the cause of the repulsion. Instead the repulsion appears to be an effect of the large... (More)
In answer to recent experimental force measurements between oppositely charged surfaces we here reproduce the repulsion in the presence of multivalent salt using Monte Carlo simulations within the primitive model. Our osmotic pressure curves are in good agreement with experimental results. In contrast with Poisson-Boltzmann calculations, both repulsion and charge inversion are seen in the simulations. Repulsion is observed only for conditions under which there is charge inversion at large separations. However, in these cases, the repulsion is present also at intermediate separations, where there is no charge inversion. The charge inversion is thereby not the cause of the repulsion. Instead the repulsion appears to be an effect of the large amount of excess salt in the slit. Both phenomena, however, are closely linked and a consequence of ion-ion correlations, promoted by a strong electrostatic coupling. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
97
issue
6
publisher
American Physical Society
external identifiers
  • wos:000239690900063
  • scopus:33747146751
ISSN
1079-7114
DOI
10.1103/PhysRevLett.97.068302
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039)
id
9e7d2b14-b085-4050-9b1e-eb5be4c5908d (old id 908520)
date added to LUP
2016-04-01 11:42:56
date last changed
2021-08-25 04:04:19
@article{9e7d2b14-b085-4050-9b1e-eb5be4c5908d,
  abstract     = {In answer to recent experimental force measurements between oppositely charged surfaces we here reproduce the repulsion in the presence of multivalent salt using Monte Carlo simulations within the primitive model. Our osmotic pressure curves are in good agreement with experimental results. In contrast with Poisson-Boltzmann calculations, both repulsion and charge inversion are seen in the simulations. Repulsion is observed only for conditions under which there is charge inversion at large separations. However, in these cases, the repulsion is present also at intermediate separations, where there is no charge inversion. The charge inversion is thereby not the cause of the repulsion. Instead the repulsion appears to be an effect of the large amount of excess salt in the slit. Both phenomena, however, are closely linked and a consequence of ion-ion correlations, promoted by a strong electrostatic coupling.},
  author       = {Trulsson, Martin and Jönsson, Bo and Åkesson, Torbjörn and Forsman, Jan and Labbez, Christophe},
  issn         = {1079-7114},
  language     = {eng},
  number       = {6},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Repulsion between oppositely charged surfaces in multivalent electrolytes},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.97.068302},
  doi          = {10.1103/PhysRevLett.97.068302},
  volume       = {97},
  year         = {2006},
}