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Anomalous surfactant diffusion in a gel of chemically cross-linked ethyl(hydroxyethyl) cellulose

Rosén, Olof; Boström, Magnus; Nydén, Magnus and Piculell, Lennart LU (2003) In The Journal of Physical Chemistry Part B 107(17). p.4074-4079
Abstract
The interactions of sodium dodecyl sulfate (SDS) with chemically cross-linked gels of ethyl(hydroxyethyl) cellulose (EHEC) were studied. Above the so-called critical association concentration (cac), binding of SDS gives rise to an increased swelling of the EHEC gels. The binding of SDS to the gels was measured with flame emission analysis of the sodium ion. The self-diffusion of the surfactant ion (DS) in the gels was studied by the NMR pulsed field gradient spin-echo technique. Both experiments were performed on gels swollen to equilibrium in SDS solutions of varying concentrations. Comparisons with the DS diffusion in a solution of non-crosslinked EHEC were also made. In the EHEC solutions the observed spin-echo decays for DS were always... (More)
The interactions of sodium dodecyl sulfate (SDS) with chemically cross-linked gels of ethyl(hydroxyethyl) cellulose (EHEC) were studied. Above the so-called critical association concentration (cac), binding of SDS gives rise to an increased swelling of the EHEC gels. The binding of SDS to the gels was measured with flame emission analysis of the sodium ion. The self-diffusion of the surfactant ion (DS) in the gels was studied by the NMR pulsed field gradient spin-echo technique. Both experiments were performed on gels swollen to equilibrium in SDS solutions of varying concentrations. Comparisons with the DS diffusion in a solution of non-crosslinked EHEC were also made. In the EHEC solutions the observed spin-echo decays for DS were always describable in terms of a single surfactant diffusion coefficient (Gaussian diffusion). In contrast, the DS diffusion in the gels above the cac (SDS) was clearly non-Gaussian, or anomalous. The echo decays in the gels could be fitte

to a log-normal distribution of diffusion coefficients. When the time during which the diffusion was measured was increased, the width of the distribution increased, while the average diffusion coefficient remained constant. An increase in the width of distribution was also seen when the SDS concentration was increased. The anomalous diffusion is ascribed to inhomogeneities in the gel. (Less)
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organization
publishing date
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Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
107
issue
17
pages
4074 - 4079
publisher
The American Chemical Society
external identifiers
  • wos:000182491000012
  • scopus:0038003817
ISSN
1520-5207
DOI
10.1021/jp0211032
language
English
LU publication?
yes
id
8e2b3edc-4f72-4dd6-a095-8edb089bd15f (old id 122178)
date added to LUP
2007-07-12 10:51:49
date last changed
2017-01-01 07:18:57
@article{8e2b3edc-4f72-4dd6-a095-8edb089bd15f,
  abstract     = {The interactions of sodium dodecyl sulfate (SDS) with chemically cross-linked gels of ethyl(hydroxyethyl) cellulose (EHEC) were studied. Above the so-called critical association concentration (cac), binding of SDS gives rise to an increased swelling of the EHEC gels. The binding of SDS to the gels was measured with flame emission analysis of the sodium ion. The self-diffusion of the surfactant ion (DS) in the gels was studied by the NMR pulsed field gradient spin-echo technique. Both experiments were performed on gels swollen to equilibrium in SDS solutions of varying concentrations. Comparisons with the DS diffusion in a solution of non-crosslinked EHEC were also made. In the EHEC solutions the observed spin-echo decays for DS were always describable in terms of a single surfactant diffusion coefficient (Gaussian diffusion). In contrast, the DS diffusion in the gels above the cac (SDS) was clearly non-Gaussian, or anomalous. The echo decays in the gels could be fitte<br/><br>
 to a log-normal distribution of diffusion coefficients. When the time during which the diffusion was measured was increased, the width of the distribution increased, while the average diffusion coefficient remained constant. An increase in the width of distribution was also seen when the SDS concentration was increased. The anomalous diffusion is ascribed to inhomogeneities in the gel.},
  author       = {Rosén, Olof and Boström, Magnus and Nydén, Magnus and Piculell, Lennart},
  issn         = {1520-5207},
  language     = {eng},
  number       = {17},
  pages        = {4074--4079},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Anomalous surfactant diffusion in a gel of chemically cross-linked ethyl(hydroxyethyl) cellulose},
  url          = {http://dx.doi.org/10.1021/jp0211032},
  volume       = {107},
  year         = {2003},
}