Some observations on the effect of the trivalent counterion Al3+ to the self-assembly of sodium dodecyl sulphate in water
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/154123
- author
- Angelescu, Daniel LU ; Caldararu, Horia and Khan, Ali LU
- organization
- publishing date
- 2004
- 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
- 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}}, }