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Phase Behavior of Microemulsions Formulated with Sodium Alkyl Polypropylene Oxide Sulfate and a Cationic Hydrotrope

Kayali, Ibrahim; Qamhieh, Khawla; Habjoqa, Fuad; AlBawab, Abeer; Olsson, Ulf LU ; Bemert, Lada and Strey, Reinhard (2012) In Journal of Dispersion Science and Technology 33(1-3). p.369-373
Abstract
The partial ternary phase diagram of anionic extended surfactant of alkyl polypropylene oxide sulfate C-12(PO)(4)SO4 alone and combined with the cationic hydrotrope, tetrabutyl ammonium bromide with water and decane were determined under ambient conditions. Middle phase microemulsion was formulated using salinity scans in the dilute region of surfactant/brine/decane. Visual inspection as well as cross polarizer and optical microscopy were used to detect anisotropy. Spinning drop tensiometer was used to measure interfacial tension (IFT). The first ternary phase diagram using the extended surfactant alone showed three one phase regions; the anisotropic lamellar liquid crystalline phase, L-alpha and the isotropic L-1 micellar liquid and L-3... (More)
The partial ternary phase diagram of anionic extended surfactant of alkyl polypropylene oxide sulfate C-12(PO)(4)SO4 alone and combined with the cationic hydrotrope, tetrabutyl ammonium bromide with water and decane were determined under ambient conditions. Middle phase microemulsion was formulated using salinity scans in the dilute region of surfactant/brine/decane. Visual inspection as well as cross polarizer and optical microscopy were used to detect anisotropy. Spinning drop tensiometer was used to measure interfacial tension (IFT). The first ternary phase diagram using the extended surfactant alone showed three one phase regions; the anisotropic lamellar liquid crystalline phase, L-alpha and the isotropic L-1 micellar liquid and L-3 sponge phase. In the second ternary phase diagram using the extended surfactant combined with tetra butyl ammonium bromide, an isotropic micellar region, L-1, appeared in the diluted area of the phase diagram. Meanwhile the L-alpha phase disappeared completely and the three phase region has a bluish transparent middle phase. Interfacial tension measurements between middle phase and brine, and between decane and brine yielded ultra low values. Calculated IFT values using the characteristic length obtained using De Gennes approximation gave almost half the measured values. The interfacial rigidity was also calculated and compared to values obtained from the literature. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Extended surfactant, middle phase microemulsion, salinity scan
in
Journal of Dispersion Science and Technology
volume
33
issue
1-3
pages
369 - 373
publisher
Taylor & Francis
external identifiers
  • wos:000301870200049
  • scopus:84858260736
ISSN
0193-2691
DOI
10.1080/01932691.2011.567154
language
English
LU publication?
yes
id
8571f471-2e7d-4790-a3f0-4abd24a959dc (old id 2594664)
date added to LUP
2012-06-01 14:35:49
date last changed
2017-01-01 05:55:28
@article{8571f471-2e7d-4790-a3f0-4abd24a959dc,
  abstract     = {The partial ternary phase diagram of anionic extended surfactant of alkyl polypropylene oxide sulfate C-12(PO)(4)SO4 alone and combined with the cationic hydrotrope, tetrabutyl ammonium bromide with water and decane were determined under ambient conditions. Middle phase microemulsion was formulated using salinity scans in the dilute region of surfactant/brine/decane. Visual inspection as well as cross polarizer and optical microscopy were used to detect anisotropy. Spinning drop tensiometer was used to measure interfacial tension (IFT). The first ternary phase diagram using the extended surfactant alone showed three one phase regions; the anisotropic lamellar liquid crystalline phase, L-alpha and the isotropic L-1 micellar liquid and L-3 sponge phase. In the second ternary phase diagram using the extended surfactant combined with tetra butyl ammonium bromide, an isotropic micellar region, L-1, appeared in the diluted area of the phase diagram. Meanwhile the L-alpha phase disappeared completely and the three phase region has a bluish transparent middle phase. Interfacial tension measurements between middle phase and brine, and between decane and brine yielded ultra low values. Calculated IFT values using the characteristic length obtained using De Gennes approximation gave almost half the measured values. The interfacial rigidity was also calculated and compared to values obtained from the literature.},
  author       = {Kayali, Ibrahim and Qamhieh, Khawla and Habjoqa, Fuad and AlBawab, Abeer and Olsson, Ulf and Bemert, Lada and Strey, Reinhard},
  issn         = {0193-2691},
  keyword      = {Extended surfactant,middle phase microemulsion,salinity scan},
  language     = {eng},
  number       = {1-3},
  pages        = {369--373},
  publisher    = {Taylor & Francis},
  series       = {Journal of Dispersion Science and Technology},
  title        = {Phase Behavior of Microemulsions Formulated with Sodium Alkyl Polypropylene Oxide Sulfate and a Cationic Hydrotrope},
  url          = {http://dx.doi.org/10.1080/01932691.2011.567154},
  volume       = {33},
  year         = {2012},
}