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H-2 NMR evidence for the formation of random mesh phases in nonionic surfactant-water systems

Baciu, M ; Olsson, Ulf LU ; Leaver, MS and Holmes, MC (2006) In The Journal of Physical Chemistry Part B 110(16). p.8184-8187
Abstract
Random mesh phases share many common features with the classical lamellar phase in that they are layered phases; but crucially, they possess nonuniform interfacial curvature, since the lamellae are pierced by water-filled pores. The introduction of curvature into the lamellae has been posited as a transitional precursor for other lyotropic phases. In this paper, we show that simple H-2 nuclear magnetic resonance (NMR) experiments provide strong indication for the formation of the random mesh phase and the NMR data correlate well with literature results from small-angle X-ray scattering. The thermal evolution of the recorded quadrupolar splitting (Delta v(Q)) is monitored within the lamellar phase of two nonionic surfactants, C16E6 and... (More)
Random mesh phases share many common features with the classical lamellar phase in that they are layered phases; but crucially, they possess nonuniform interfacial curvature, since the lamellae are pierced by water-filled pores. The introduction of curvature into the lamellae has been posited as a transitional precursor for other lyotropic phases. In this paper, we show that simple H-2 nuclear magnetic resonance (NMR) experiments provide strong indication for the formation of the random mesh phase and the NMR data correlate well with literature results from small-angle X-ray scattering. The thermal evolution of the recorded quadrupolar splitting (Delta v(Q)) is monitored within the lamellar phase of two nonionic surfactants, C16E6 and C12E5, as the samples are cooled or heated, and a marked and reversible change in the evolution of Delta v(Q) is observed. Data from heavy water and deuterium labeled surfactant show the same temperature dependence and consequently report on the same structural changes with temperature. The formation of the random mesh phase is quantified in terms of an effective order parameter that is unity in the classical lamellar phase and takes values of < 1 in the random mesh phase, reaching 0.6 at lower temperatures. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
110
issue
16
pages
8184 - 8187
publisher
The American Chemical Society (ACS)
external identifiers
  • wos:000237163700004
  • scopus:33646392733
ISSN
1520-5207
DOI
10.1021/jp0611323
language
English
LU publication?
yes
id
1a81e6df-38f9-4cdd-9623-33d472c464dc (old id 410368)
date added to LUP
2016-04-01 16:46:19
date last changed
2020-09-30 04:09:02
@article{1a81e6df-38f9-4cdd-9623-33d472c464dc,
  abstract     = {Random mesh phases share many common features with the classical lamellar phase in that they are layered phases; but crucially, they possess nonuniform interfacial curvature, since the lamellae are pierced by water-filled pores. The introduction of curvature into the lamellae has been posited as a transitional precursor for other lyotropic phases. In this paper, we show that simple H-2 nuclear magnetic resonance (NMR) experiments provide strong indication for the formation of the random mesh phase and the NMR data correlate well with literature results from small-angle X-ray scattering. The thermal evolution of the recorded quadrupolar splitting (Delta v(Q)) is monitored within the lamellar phase of two nonionic surfactants, C16E6 and C12E5, as the samples are cooled or heated, and a marked and reversible change in the evolution of Delta v(Q) is observed. Data from heavy water and deuterium labeled surfactant show the same temperature dependence and consequently report on the same structural changes with temperature. The formation of the random mesh phase is quantified in terms of an effective order parameter that is unity in the classical lamellar phase and takes values of &lt; 1 in the random mesh phase, reaching 0.6 at lower temperatures.},
  author       = {Baciu, M and Olsson, Ulf and Leaver, MS and Holmes, MC},
  issn         = {1520-5207},
  language     = {eng},
  number       = {16},
  pages        = {8184--8187},
  publisher    = {The American Chemical Society (ACS)},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {H-2 NMR evidence for the formation of random mesh phases in nonionic surfactant-water systems},
  url          = {http://dx.doi.org/10.1021/jp0611323},
  doi          = {10.1021/jp0611323},
  volume       = {110},
  year         = {2006},
}