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From bilayers to micelles in a dilute surfactant system: a phase with a perforated bilayer network

Rasmusson, Marcus and Olsson, Ulf LU (2002) Conference on Lipid and Polymer-Lipid Systems, 2002 In Progress in Colloid & Polymer Science 120. p.74-82
Abstract
The quaternary system comprising sodium dodecyl sulfate/water/pentanol/dodecane has been studied at high oil content and at two different water-to-surfactant ratios. Of particular interest is a highly flow birefringent, isotropic fluid phase, which occupies an island in the pseudo-ternary phase diagrams between the L<sub>2</sub> phase and the L<sub>3</sub> phase and which is in close proximity to the dilute lamellar phase. In order to investigate its microstructure, the self-diffusion coefficient of the solvent was measured in this phase using Fourier transform pulsed-field-gradient spin-echo NMR spectroscopy, and its value was found to be significantly lower than those in the L<sub>3</sub> phase of the... (More)
The quaternary system comprising sodium dodecyl sulfate/water/pentanol/dodecane has been studied at high oil content and at two different water-to-surfactant ratios. Of particular interest is a highly flow birefringent, isotropic fluid phase, which occupies an island in the pseudo-ternary phase diagrams between the L<sub>2</sub> phase and the L<sub>3</sub> phase and which is in close proximity to the dilute lamellar phase. In order to investigate its microstructure, the self-diffusion coefficient of the solvent was measured in this phase using Fourier transform pulsed-field-gradient spin-echo NMR spectroscopy, and its value was found to be significantly lower than those in the L<sub>3</sub> phase of the same system. Comparative conductivity measurements were also performed, and they showed that the conducting material in the phase forms an infinitely connected network. In conclusion, it seems reasonable to describe the phase microstructure as a connected perforated bilayer or possibly a connected three-dimensional network of reverse cylinders. The conductivity of the L<sub>x</sub> phase decreases strongly upon stirring. Taking into account the flow birefringence, this is interpreted as a shear-induced phase transition to a lamellar phase (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
self-assembly structures, sodium dodecyl sulfate-water-pentanol-dodecane, quaternary system, high oil content, water-to-surfactant ratios, dilute surfactant system, bilayers, micelles, perforated bilayer network, highly flow birefringent phase, isotropic fluid phase, pseudo-ternary phase diagrams, self-diffusion coefficient, Fourier transform spin-echo NMR, three-dimensional network, phase microstructure, free energy, swelling, flexible surfactant bilayers, small angle X-ray scattering, reverse cylinders, parallel oriented monolayers, oppositely oriented monolayers
in
Progress in Colloid & Polymer Science
volume
120
pages
74 - 82
conference name
Conference on Lipid and Polymer-Lipid Systems, 2002
external identifiers
  • wos:000177564900010
  • other:CODEN: PCPSD7
  • scopus:0036949665
ISSN
0340-255X
language
English
LU publication?
yes
id
f89a199b-842d-4e05-89d2-19e1243d8777 (old id 610573)
alternative location
http://www.springerlink.com/content/4v5q1849u6b7hwtr/
date added to LUP
2007-11-28 14:30:10
date last changed
2017-01-01 07:45:10
@inproceedings{f89a199b-842d-4e05-89d2-19e1243d8777,
  abstract     = {The quaternary system comprising sodium dodecyl sulfate/water/pentanol/dodecane has been studied at high oil content and at two different water-to-surfactant ratios. Of particular interest is a highly flow birefringent, isotropic fluid phase, which occupies an island in the pseudo-ternary phase diagrams between the L&lt;sub&gt;2&lt;/sub&gt; phase and the L&lt;sub&gt;3&lt;/sub&gt; phase and which is in close proximity to the dilute lamellar phase. In order to investigate its microstructure, the self-diffusion coefficient of the solvent was measured in this phase using Fourier transform pulsed-field-gradient spin-echo NMR spectroscopy, and its value was found to be significantly lower than those in the L&lt;sub&gt;3&lt;/sub&gt; phase of the same system. Comparative conductivity measurements were also performed, and they showed that the conducting material in the phase forms an infinitely connected network. In conclusion, it seems reasonable to describe the phase microstructure as a connected perforated bilayer or possibly a connected three-dimensional network of reverse cylinders. The conductivity of the L&lt;sub&gt;x&lt;/sub&gt; phase decreases strongly upon stirring. Taking into account the flow birefringence, this is interpreted as a shear-induced phase transition to a lamellar phase},
  author       = {Rasmusson, Marcus and Olsson, Ulf},
  booktitle    = {Progress in Colloid & Polymer Science},
  issn         = {0340-255X},
  keyword      = {self-assembly structures,sodium dodecyl sulfate-water-pentanol-dodecane,quaternary system,high oil content,water-to-surfactant ratios,dilute surfactant system,bilayers,micelles,perforated bilayer network,highly flow birefringent phase,isotropic fluid phase,pseudo-ternary phase diagrams,self-diffusion coefficient,Fourier transform spin-echo NMR,three-dimensional network,phase microstructure,free energy,swelling,flexible surfactant bilayers,small angle X-ray scattering,reverse cylinders,parallel oriented monolayers,oppositely oriented monolayers},
  language     = {eng},
  pages        = {74--82},
  title        = {From bilayers to micelles in a dilute surfactant system: a phase with a perforated bilayer network},
  volume       = {120},
  year         = {2002},
}