Advanced

Reswelling of polyelectrolyte hydrogels by oppositely charged surfactants

Lynch, Iseult LU ; Sjöström, Jesper LU and Piculell, Lennart LU (2005) In The Journal of Physical Chemistry Part B 109(9). p.4258-4262
Abstract
The interactions between charged alkylacrylamide gels of varying hydrophobicity and charge density and the oppositely charged surfactant hexadecyltrimethylammonium (C(16)TA(+)) have been investigated to determine the conditions necessary to induce excess surfactant binding (beyond charge neutralization) and resolubilization of the polymer-surfactant complex. In all cases, an initial gel collapse occurred due to neutralization of the charges in the gel, and the volume of the collapsed gel was smaller than that of the corresponding neutral gel at the same surfactant concentration, as a result of the formation of interchain micellar cross-links. For gels containing neutral repeating units that were found previously to bind C(16)TA(+), a... (More)
The interactions between charged alkylacrylamide gels of varying hydrophobicity and charge density and the oppositely charged surfactant hexadecyltrimethylammonium (C(16)TA(+)) have been investigated to determine the conditions necessary to induce excess surfactant binding (beyond charge neutralization) and resolubilization of the polymer-surfactant complex. In all cases, an initial gel collapse occurred due to neutralization of the charges in the gel, and the volume of the collapsed gel was smaller than that of the corresponding neutral gel at the same surfactant concentration, as a result of the formation of interchain micellar cross-links. For gels containing neutral repeating units that were found previously to bind C(16)TA(+), a subsequent sharp reswelling of the gel network occurred, beginning at a critical surfactant concentration called the cac(2). The reswelling is due to binding of excess surfactant, which results in the gels becoming recharged. For gels whose neutral repeating units do not bind C(16)TA(+), there was no reswelling behavior (no cac(2)), but there was a gradual increase of the swelling back to that of the equivalent neutral gel with increasing surfactant concentration. The results are interpreted in terms of the expected surfactant binding isotherm. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
109
issue
9
pages
4258 - 4262
publisher
The American Chemical Society
external identifiers
  • wos:000227479400080
  • scopus:15744402276
ISSN
1520-5207
DOI
10.1021/jp045279a
language
English
LU publication?
yes
id
8c41dadb-7e88-42ec-85e7-ea9109faf904 (old id 157472)
date added to LUP
2007-07-11 16:01:05
date last changed
2017-01-01 07:02:15
@article{8c41dadb-7e88-42ec-85e7-ea9109faf904,
  abstract     = {The interactions between charged alkylacrylamide gels of varying hydrophobicity and charge density and the oppositely charged surfactant hexadecyltrimethylammonium (C(16)TA(+)) have been investigated to determine the conditions necessary to induce excess surfactant binding (beyond charge neutralization) and resolubilization of the polymer-surfactant complex. In all cases, an initial gel collapse occurred due to neutralization of the charges in the gel, and the volume of the collapsed gel was smaller than that of the corresponding neutral gel at the same surfactant concentration, as a result of the formation of interchain micellar cross-links. For gels containing neutral repeating units that were found previously to bind C(16)TA(+), a subsequent sharp reswelling of the gel network occurred, beginning at a critical surfactant concentration called the cac(2). The reswelling is due to binding of excess surfactant, which results in the gels becoming recharged. For gels whose neutral repeating units do not bind C(16)TA(+), there was no reswelling behavior (no cac(2)), but there was a gradual increase of the swelling back to that of the equivalent neutral gel with increasing surfactant concentration. The results are interpreted in terms of the expected surfactant binding isotherm.},
  author       = {Lynch, Iseult and Sjöström, Jesper and Piculell, Lennart},
  issn         = {1520-5207},
  language     = {eng},
  number       = {9},
  pages        = {4258--4262},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Reswelling of polyelectrolyte hydrogels by oppositely charged surfactants},
  url          = {http://dx.doi.org/10.1021/jp045279a},
  volume       = {109},
  year         = {2005},
}