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Mean force between like-charged macroions at high electrostatic coupling

Linse, Per LU (2002) In Journal of Physics: Condensed Matter1990-01-01+01:00 14(49). p.13449-13467
Abstract
Interactions between two like-charged macroions in the presence of their counterions confined in a cylindrical cell have been investigated by Monte Carlo simulations. The mean force and the potential of mean force (pmf) as a function of the macroion separation have been determined at conditions at which short-range attractions become significant. As the electrostatic coupling is increased, the nature of the mean force changes from being purely repulsive to bein

attractive at short separations and finally attractive at all separations. At a sufficiently large electrostatic coupling, the attractive mean force is promoted by an increase of the macroion charge to counterion charge ratio and by an increase of the macroion volume... (More)
Interactions between two like-charged macroions in the presence of their counterions confined in a cylindrical cell have been investigated by Monte Carlo simulations. The mean force and the potential of mean force (pmf) as a function of the macroion separation have been determined at conditions at which short-range attractions become significant. As the electrostatic coupling is increased, the nature of the mean force changes from being purely repulsive to bein

attractive at short separations and finally attractive at all separations. At a sufficiently large electrostatic coupling, the attractive mean force is promoted by an increase of the macroion charge to counterion charge ratio and by an increase of the macroion volume fraction (assuming a not too concentrated solution). At the onset of an attractive force, nearly all counterions are localized at the macroion surfaces, but the counterions still display a two-dimensional fluid structure. The pmfs determined from the cylindrical cell model agreed qualitatively very well with those obtained from simulations of corresponding fluids, suggesting that higher-order macroion correlations are of less importance. Finally, it is argued that the attractive component of the mean force originates from spatial correlations between counterions residing near different macroions. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics: Condensed Matter1990-01-01+01:00
volume
14
issue
49
pages
13449 - 13467
publisher
IOP Publishing
external identifiers
  • wos:000180415500009
  • scopus:0037122388
ISSN
1361-648X
DOI
10.1088/0953-8984/14/49/304
language
English
LU publication?
yes
id
5c2c1f1a-8a6e-4d2f-a7f1-55672eed86d7 (old id 122085)
date added to LUP
2007-07-11 15:48:08
date last changed
2017-07-23 04:45:49
@article{5c2c1f1a-8a6e-4d2f-a7f1-55672eed86d7,
  abstract     = {Interactions between two like-charged macroions in the presence of their counterions confined in a cylindrical cell have been investigated by Monte Carlo simulations. The mean force and the potential of mean force (pmf) as a function of the macroion separation have been determined at conditions at which short-range attractions become significant. As the electrostatic coupling is increased, the nature of the mean force changes from being purely repulsive to bein<br/><br>
 attractive at short separations and finally attractive at all separations. At a sufficiently large electrostatic coupling, the attractive mean force is promoted by an increase of the macroion charge to counterion charge ratio and by an increase of the macroion volume fraction (assuming a not too concentrated solution). At the onset of an attractive force, nearly all counterions are localized at the macroion surfaces, but the counterions still display a two-dimensional fluid structure. The pmfs determined from the cylindrical cell model agreed qualitatively very well with those obtained from simulations of corresponding fluids, suggesting that higher-order macroion correlations are of less importance. Finally, it is argued that the attractive component of the mean force originates from spatial correlations between counterions residing near different macroions.},
  author       = {Linse, Per},
  issn         = {1361-648X},
  language     = {eng},
  number       = {49},
  pages        = {13449--13467},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics: Condensed Matter1990-01-01+01:00},
  title        = {Mean force between like-charged macroions at high electrostatic coupling},
  url          = {http://dx.doi.org/10.1088/0953-8984/14/49/304},
  volume       = {14},
  year         = {2002},
}