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Some observations on the effect of the trivalent counterion Al3+ to the self-assembly of sodium dodecyl sulphate in water

Angelescu, Daniel LU ; Caldararu, Horia and Khan, Ali LU (2004) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 245(1-3). p.49-60
Abstract
The phase behavior and phase structure of the SDS (sodium dodecyl sulfate)-Al(NO3)(3)-H2O system have been studied by combined NMR, SAXS, cryo-TEM and optical polarization microscopy methods at 298 K (25 degreesC) and 311 K (38 degreesC). At 298 K, the micellar solution phase of the binary system SDS-water is not capable of solubilising substantial amount of Al(NO3)(3) salt, and at a certain substoichiometric molar ratio Al(NO3)(3)/SDS. the solution phase coexists with a precipitate. When the concentration of the salt exceeds 5 wt.%, the precipitate is completely solubilised giving rise to a concentrated micellar phase that dominates the phase diagram. At high concentration of Al(NO3)(3) (30-40 wt.%), a vesicle phase is formed at low... (More)
The phase behavior and phase structure of the SDS (sodium dodecyl sulfate)-Al(NO3)(3)-H2O system have been studied by combined NMR, SAXS, cryo-TEM and optical polarization microscopy methods at 298 K (25 degreesC) and 311 K (38 degreesC). At 298 K, the micellar solution phase of the binary system SDS-water is not capable of solubilising substantial amount of Al(NO3)(3) salt, and at a certain substoichiometric molar ratio Al(NO3)(3)/SDS. the solution phase coexists with a precipitate. When the concentration of the salt exceeds 5 wt.%, the precipitate is completely solubilised giving rise to a concentrated micellar phase that dominates the phase diagram. At high concentration of Al(NO3)(3) (30-40 wt.%), a vesicle phase is formed at low (maximum 10 wt.%) SDS content. On warming to 311 K, the vesicle region expanded, by converting the hydrated surfactant crystals to a lamellar liquid crystalline phase, around the concentrated micellar phase, with a narrow width towards the SDS-H2O axis (up to 43.5 wt.% SDS and 3 wt.% Al(NO3)(3)). The lamellar phase coexists with both hexagonal and micellar phases with appropriate multiphase regions. The optical- and cryo-transmission electron microscopy images show the presence of unilamellar vesicles and the liquid crystalline phases are characterized by H-2 NMR quadrupolar splitting and following the liquid crystalline texture by optical microscopy techniques. The NMR self-diffusion measurements, together with the cryo-TEM micrographs, identified the long worm-like micelles in the redissolution area. (C) 2004 Elsevier B.V. All rights reserved. (Less)
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type
Contribution to journal
publication status
published
subject
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
245
issue
1-3
pages
49 - 60
publisher
Elsevier
external identifiers
  • wos:000224818600008
  • scopus:4644245380
ISSN
0927-7757
DOI
10.1016/j.colsurfa.2004.01.040
language
English
LU publication?
yes
id
ab60e9be-1ac5-433a-aa9d-cd049a06a8cf (old id 154123)
date added to LUP
2007-07-10 16:12:04
date last changed
2017-01-01 07:23:52
@article{ab60e9be-1ac5-433a-aa9d-cd049a06a8cf,
  abstract     = {The phase behavior and phase structure of the SDS (sodium dodecyl sulfate)-Al(NO3)(3)-H2O system have been studied by combined NMR, SAXS, cryo-TEM and optical polarization microscopy methods at 298 K (25 degreesC) and 311 K (38 degreesC). At 298 K, the micellar solution phase of the binary system SDS-water is not capable of solubilising substantial amount of Al(NO3)(3) salt, and at a certain substoichiometric molar ratio Al(NO3)(3)/SDS. the solution phase coexists with a precipitate. When the concentration of the salt exceeds 5 wt.%, the precipitate is completely solubilised giving rise to a concentrated micellar phase that dominates the phase diagram. At high concentration of Al(NO3)(3) (30-40 wt.%), a vesicle phase is formed at low (maximum 10 wt.%) SDS content. On warming to 311 K, the vesicle region expanded, by converting the hydrated surfactant crystals to a lamellar liquid crystalline phase, around the concentrated micellar phase, with a narrow width towards the SDS-H2O axis (up to 43.5 wt.% SDS and 3 wt.% Al(NO3)(3)). The lamellar phase coexists with both hexagonal and micellar phases with appropriate multiphase regions. The optical- and cryo-transmission electron microscopy images show the presence of unilamellar vesicles and the liquid crystalline phases are characterized by H-2 NMR quadrupolar splitting and following the liquid crystalline texture by optical microscopy techniques. The NMR self-diffusion measurements, together with the cryo-TEM micrographs, identified the long worm-like micelles in the redissolution area. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Angelescu, Daniel and Caldararu, Horia and Khan, Ali},
  issn         = {0927-7757},
  language     = {eng},
  number       = {1-3},
  pages        = {49--60},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Some observations on the effect of the trivalent counterion Al3+ to the self-assembly of sodium dodecyl sulphate in water},
  url          = {http://dx.doi.org/10.1016/j.colsurfa.2004.01.040},
  volume       = {245},
  year         = {2004},
}