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Modulation of colloidal forces with polyampholytes

Jönsson, Bo LU ; Khan, Malek O; Åkesson, Torbjörn LU and Woodward, Cliff E (2002) In Langmuir 18(4). p.1426-1432
Abstract
The stability of a colloidal solution consisting of a mixture of charged spherical aggregates and polyampholytes is investigated by means of Monte Carlo simulations. The double-layer repulsion between the charged macroions is reduced upon addition of neutral polyampholyte and for sufficiently highly charged colloids it is converted into a net attractive interaction. Attractive interactions can also be created between macroions with polyampholytes that have a net charge of the same sign as the macroion. The mechanism for the attractive interactions is the same as for charged aggregates destabilized by oppositely charged polyelectrolytes; that is, a chain adsorbs to two macroions forming a bridge between them. Strictly alternating... (More)
The stability of a colloidal solution consisting of a mixture of charged spherical aggregates and polyampholytes is investigated by means of Monte Carlo simulations. The double-layer repulsion between the charged macroions is reduced upon addition of neutral polyampholyte and for sufficiently highly charged colloids it is converted into a net attractive interaction. Attractive interactions can also be created between macroions with polyampholytes that have a net charge of the same sign as the macroion. The mechanism for the attractive interactions is the same as for charged aggregates destabilized by oppositely charged polyelectrolytes; that is, a chain adsorbs to two macroions forming a bridge between them. Strictly alternating polyampholytes give rise to a weak attractive component, while chains with larger blocks of alternating positive and negative monomers are efficient destabilizers. The destabilizing action can qualitatively be correlated with the chain polarizability. The linear polarizability accounts for the behavior in weakly charged dispersions, while higher order polarizabilities seem to play a key role in solutions with more highly charged aggregates. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Langmuir
volume
18
issue
4
pages
1426 - 1432
publisher
The American Chemical Society
external identifiers
  • wos:000174009300069
  • scopus:0037133449
ISSN
0743-7463
DOI
10.1021/la011047g
language
English
LU publication?
yes
id
1f992245-386f-481b-a4e2-490d08b09c6e (old id 342776)
date added to LUP
2007-10-31 13:25:50
date last changed
2017-01-01 04:45:30
@article{1f992245-386f-481b-a4e2-490d08b09c6e,
  abstract     = {The stability of a colloidal solution consisting of a mixture of charged spherical aggregates and polyampholytes is investigated by means of Monte Carlo simulations. The double-layer repulsion between the charged macroions is reduced upon addition of neutral polyampholyte and for sufficiently highly charged colloids it is converted into a net attractive interaction. Attractive interactions can also be created between macroions with polyampholytes that have a net charge of the same sign as the macroion. The mechanism for the attractive interactions is the same as for charged aggregates destabilized by oppositely charged polyelectrolytes; that is, a chain adsorbs to two macroions forming a bridge between them. Strictly alternating polyampholytes give rise to a weak attractive component, while chains with larger blocks of alternating positive and negative monomers are efficient destabilizers. The destabilizing action can qualitatively be correlated with the chain polarizability. The linear polarizability accounts for the behavior in weakly charged dispersions, while higher order polarizabilities seem to play a key role in solutions with more highly charged aggregates.},
  author       = {Jönsson, Bo and Khan, Malek O and Åkesson, Torbjörn and Woodward, Cliff E},
  issn         = {0743-7463},
  language     = {eng},
  number       = {4},
  pages        = {1426--1432},
  publisher    = {The American Chemical Society},
  series       = {Langmuir},
  title        = {Modulation of colloidal forces with polyampholytes},
  url          = {http://dx.doi.org/10.1021/la011047g},
  volume       = {18},
  year         = {2002},
}