From bilayers to micelles in a dilute surfactant system: a phase with a perforated bilayer network
(2002) Conference on Lipid and Polymer-Lipid Systems, 2002 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:
https://lup.lub.lu.se/record/610573
- author
- Rasmusson, Marcus and Olsson, Ulf LU
- organization
- publishing date
- 2002
- 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
- host publication
- Progress in Colloid & Polymer Science
- volume
- 120
- pages
- 74 - 82
- conference name
- Conference on Lipid and Polymer-Lipid Systems, 2002
- conference location
- Chia Laguna, Italy
- conference dates
- 2002-10-01 - 2002-10-02
- external identifiers
-
- wos:000177564900010
- other:CODEN: PCPSD7
- scopus:0036949665
- ISSN
- 0340-255X
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Center for Chemistry and Chemical Engineering (011001000), Physical Chemistry 1 (S) (011001006)
- id
- f89a199b-842d-4e05-89d2-19e1243d8777 (old id 610573)
- alternative location
- http://www.springerlink.com/content/4v5q1849u6b7hwtr/
- date added to LUP
- 2016-04-04 09:14:22
- date last changed
- 2022-02-28 07:04:22
@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<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}},
author = {{Rasmusson, Marcus and Olsson, Ulf}},
booktitle = {{Progress in Colloid & Polymer Science}},
issn = {{0340-255X}},
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}},
language = {{eng}},
pages = {{74--82}},
title = {{From bilayers to micelles in a dilute surfactant system: a phase with a perforated bilayer network}},
url = {{http://www.springerlink.com/content/4v5q1849u6b7hwtr/}},
volume = {{120}},
year = {{2002}},
}