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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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Contribution to journal
publication status
published
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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
2016-04-01 17:05:16
date last changed
2022-01-29 00:17:33
@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}},
  doi          = {{10.1016/j.colsurfa.2004.01.040}},
  volume       = {{245}},
  year         = {{2004}},
}