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Hydrophobicity and counterion effects on the binding of ionic surfactants to uncharged polymeric hydrogels

Lynch, Iseult LU ; Sjöström, Jesper LU and Piculell, Lennart LU (2005) In The Journal of Physical Chemistry Part B 109(9). p.4252-4257
Abstract
Gel swelling experiments have been used to study the binding of ionic surfactants to a series of nonionic alkylacrylamide hydrogels of increasing hydrophobicity. The binding of hexadecyl trimethylammonium (C-16-TA(+)) to uncharged gels is sensitive to both the hydrophobicity of the gel and the counterion to the surfactant. There is a minimum hydrophobicity threshold below which binding of the surfactant does not occur, and this is influenced by the counterion to the surfactant. The surfactant concentration at the onset of binding, the critical association concentration (cac), decreases with increasing gel hydrophobicity. The maximum swelling of the gel (at intermediate network hydrophobicity) increases in the order of the Hofmeister series... (More)
Gel swelling experiments have been used to study the binding of ionic surfactants to a series of nonionic alkylacrylamide hydrogels of increasing hydrophobicity. The binding of hexadecyl trimethylammonium (C-16-TA(+)) to uncharged gels is sensitive to both the hydrophobicity of the gel and the counterion to the surfactant. There is a minimum hydrophobicity threshold below which binding of the surfactant does not occur, and this is influenced by the counterion to the surfactant. The surfactant concentration at the onset of binding, the critical association concentration (cac), decreases with increasing gel hydrophobicity. The maximum swelling of the gel (at intermediate network hydrophobicity) increases in the order of the Hofmeister series of anions, bromide (Br-) < chloride (Cl-) < acetate (Ac-). At higher gel hydrophobicity, differences in swelling are no longer observed on changing the counterion. A minimum hydrophobicity threshold was also found for the binding of the anionic surfactants sodium dodecyl sulfate (SDS) and sodium dodecyl-di(ethylene oxide)sulfate (SD-(EO)(2)-S). Differences in the swelling behavior with network hydrophobicity are explained in terms of the degree of saturation of the gel with surfactant at the cmc. (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
9
pages
4252 - 4257
publisher
The American Chemical Society
external identifiers
  • wos:000227479400079
  • scopus:15744400060
ISSN
1520-5207
DOI
10.1021/jp045280+
language
English
LU publication?
yes
id
bc03e1d3-49b5-42ca-9bf8-959692138db1 (old id 157467)
date added to LUP
2007-07-11 16:02:19
date last changed
2017-01-01 06:54:39
@article{bc03e1d3-49b5-42ca-9bf8-959692138db1,
  abstract     = {Gel swelling experiments have been used to study the binding of ionic surfactants to a series of nonionic alkylacrylamide hydrogels of increasing hydrophobicity. The binding of hexadecyl trimethylammonium (C-16-TA(+)) to uncharged gels is sensitive to both the hydrophobicity of the gel and the counterion to the surfactant. There is a minimum hydrophobicity threshold below which binding of the surfactant does not occur, and this is influenced by the counterion to the surfactant. The surfactant concentration at the onset of binding, the critical association concentration (cac), decreases with increasing gel hydrophobicity. The maximum swelling of the gel (at intermediate network hydrophobicity) increases in the order of the Hofmeister series of anions, bromide (Br-) &lt; chloride (Cl-) &lt; acetate (Ac-). At higher gel hydrophobicity, differences in swelling are no longer observed on changing the counterion. A minimum hydrophobicity threshold was also found for the binding of the anionic surfactants sodium dodecyl sulfate (SDS) and sodium dodecyl-di(ethylene oxide)sulfate (SD-(EO)(2)-S). Differences in the swelling behavior with network hydrophobicity are explained in terms of the degree of saturation of the gel with surfactant at the cmc.},
  author       = {Lynch, Iseult and Sjöström, Jesper and Piculell, Lennart},
  issn         = {1520-5207},
  language     = {eng},
  number       = {9},
  pages        = {4252--4257},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Hydrophobicity and counterion effects on the binding of ionic surfactants to uncharged polymeric hydrogels},
  url          = {http://dx.doi.org/10.1021/jp045280+},
  volume       = {109},
  year         = {2005},
}