Advanced

Fluorescence study on the size and shape of sodium dodecyl sulphate-aluminium salt micelles

Vasilescu, M; Angelescu, D; Caldararu, H; Almgren, M and Khan, Ali LU (2004) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 235(1-3). p.57-64
Abstract
The application of time-resolved fluorescence methods to study the aggregation behavior in aqueous solution of anionic surfactant sodium dodecyl sulphate (SDS) in presence of trivalent counterions (Al3+) was investigated. Addition of small amounts of aluminum salt to dilute micellar solutions (< 10 wt.% SDS) resulted in isotropic fluid solutions, but for a molar ratio [SDS]/[Al(NO3)(3)] lower than 6.7:1, precipitation occurred. The precipitate was resolubilized by further addition of aluminum salt (>5 wt.% Al(NO3)(3)). Using the time-resolved fluorescence quenching method and employing pyrene-decylpyridinium chloride as probe-quencher pair, the aggregation numbers and fluorescence quenching rates for spherical micelles were... (More)
The application of time-resolved fluorescence methods to study the aggregation behavior in aqueous solution of anionic surfactant sodium dodecyl sulphate (SDS) in presence of trivalent counterions (Al3+) was investigated. Addition of small amounts of aluminum salt to dilute micellar solutions (< 10 wt.% SDS) resulted in isotropic fluid solutions, but for a molar ratio [SDS]/[Al(NO3)(3)] lower than 6.7:1, precipitation occurred. The precipitate was resolubilized by further addition of aluminum salt (>5 wt.% Al(NO3)(3)). Using the time-resolved fluorescence quenching method and employing pyrene-decylpyridinium chloride as probe-quencher pair, the aggregation numbers and fluorescence quenching rates for spherical micelles were determined. Fluorescence measurements give evidence for different kind of micelles in the two isotropic areas investigated. At low aluminum salt concentration, the micelles are relatively small, but larger than in the absence of salt. At high enough salt concentrations, the precipitate is resolubilized into long rod-like micelles. The strong viscoelastic properties in the linear regime supported the presence of 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:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Time-resolved fluorescence, Micellar solution, Al3+ effect, Aggregation number
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
235
issue
1-3
pages
57 - 64
publisher
Elsevier
external identifiers
  • wos:000220876000007
  • scopus:1542722926
ISSN
0927-7757
DOI
10.1016/j.colsurfa.2004.01.007
language
English
LU publication?
yes
id
eae41688-f3b2-4297-8189-ac4d503a6caa (old id 154098)
date added to LUP
2007-07-12 13:40:41
date last changed
2017-01-01 07:20:48
@article{eae41688-f3b2-4297-8189-ac4d503a6caa,
  abstract     = {The application of time-resolved fluorescence methods to study the aggregation behavior in aqueous solution of anionic surfactant sodium dodecyl sulphate (SDS) in presence of trivalent counterions (Al3+) was investigated. Addition of small amounts of aluminum salt to dilute micellar solutions (&lt; 10 wt.% SDS) resulted in isotropic fluid solutions, but for a molar ratio [SDS]/[Al(NO3)(3)] lower than 6.7:1, precipitation occurred. The precipitate was resolubilized by further addition of aluminum salt (&gt;5 wt.% Al(NO3)(3)). Using the time-resolved fluorescence quenching method and employing pyrene-decylpyridinium chloride as probe-quencher pair, the aggregation numbers and fluorescence quenching rates for spherical micelles were determined. Fluorescence measurements give evidence for different kind of micelles in the two isotropic areas investigated. At low aluminum salt concentration, the micelles are relatively small, but larger than in the absence of salt. At high enough salt concentrations, the precipitate is resolubilized into long rod-like micelles. The strong viscoelastic properties in the linear regime supported the presence of worm-like micelles in the redissolution area. (C) 2004 Elsevier B.V. All rights reserved.},
  author       = {Vasilescu, M and Angelescu, D and Caldararu, H and Almgren, M and Khan, Ali},
  issn         = {0927-7757},
  keyword      = {Time-resolved fluorescence,Micellar solution,Al3+ effect,Aggregation number},
  language     = {eng},
  number       = {1-3},
  pages        = {57--64},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Fluorescence study on the size and shape of sodium dodecyl sulphate-aluminium salt micelles},
  url          = {http://dx.doi.org/10.1016/j.colsurfa.2004.01.007},
  volume       = {235},
  year         = {2004},
}