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Polyion adsorption onto catanionic surfaces. A Monte Carlo study

Dias, Rita LU ; Pais, A A C C; Linse, Per LU ; Miguel, Maria LU and Lindman, Björn LU (2005) In The Journal of Physical Chemistry Part B 109(23). p.11781-11788
Abstract
The adsorption of a single and negatively charged polyion with varying flexibility onto a surface carrying both negative and positive charges representing a charged membrane surface has been investigated by using a simple model employing Monte Carlo simulations. The polyion was represented by a sequence of negatively charged hard spheres connected with harmonic bonds. The charged surface groups were also represented by charged hard spheres, and they were positioned on a hard surface slightly protruding into the solution. The surface charges were either frozen in a liquidlike structure or laterally mobile. With a large excess of positive surface charges, the classical picture of a strongly adsorbed polyion with an extended and flat... (More)
The adsorption of a single and negatively charged polyion with varying flexibility onto a surface carrying both negative and positive charges representing a charged membrane surface has been investigated by using a simple model employing Monte Carlo simulations. The polyion was represented by a sequence of negatively charged hard spheres connected with harmonic bonds. The charged surface groups were also represented by charged hard spheres, and they were positioned on a hard surface slightly protruding into the solution. The surface charges were either frozen in a liquidlike structure or laterally mobile. With a large excess of positive surface charges, the classical picture of a strongly adsorbed polyion with an extended and flat configuration emerged. However, adsorption also appeared at a net neutral surface or at a weakly negatively charged surface, and at these conditions the adsorption was stronger with a flexible polyion as compared to a semiflexible one, two features not appearing in simpler models containing homogeneously charged surfaces. The presence of charged surface patches (frozen surface charges) and the ability of polarization of the surface charges (mobile surface charges) are the main reasons for the enhanced adsorption. The stronger adsorption with the flexible chain is caused by its greater ability to spatially correlate with the surface charges. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
109
issue
23
pages
11781 - 11788
publisher
The American Chemical Society
external identifiers
  • wos:000229751800054
  • scopus:21644469343
ISSN
1520-5207
DOI
10.1021/jp050158b
language
English
LU publication?
yes
id
dc46b704-48fe-460e-a215-6ace0f0984b7 (old id 157325)
date added to LUP
2007-07-11 10:31:11
date last changed
2017-10-01 04:46:47
@article{dc46b704-48fe-460e-a215-6ace0f0984b7,
  abstract     = {The adsorption of a single and negatively charged polyion with varying flexibility onto a surface carrying both negative and positive charges representing a charged membrane surface has been investigated by using a simple model employing Monte Carlo simulations. The polyion was represented by a sequence of negatively charged hard spheres connected with harmonic bonds. The charged surface groups were also represented by charged hard spheres, and they were positioned on a hard surface slightly protruding into the solution. The surface charges were either frozen in a liquidlike structure or laterally mobile. With a large excess of positive surface charges, the classical picture of a strongly adsorbed polyion with an extended and flat configuration emerged. However, adsorption also appeared at a net neutral surface or at a weakly negatively charged surface, and at these conditions the adsorption was stronger with a flexible polyion as compared to a semiflexible one, two features not appearing in simpler models containing homogeneously charged surfaces. The presence of charged surface patches (frozen surface charges) and the ability of polarization of the surface charges (mobile surface charges) are the main reasons for the enhanced adsorption. The stronger adsorption with the flexible chain is caused by its greater ability to spatially correlate with the surface charges.},
  author       = {Dias, Rita and Pais, A A C C and Linse, Per and Miguel, Maria and Lindman, Björn},
  issn         = {1520-5207},
  language     = {eng},
  number       = {23},
  pages        = {11781--11788},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Polyion adsorption onto catanionic surfaces. A Monte Carlo study},
  url          = {http://dx.doi.org/10.1021/jp050158b},
  volume       = {109},
  year         = {2005},
}