Solubilization of polar oils in surfactant self-organized structures

Citation
H. Kunieda et al., Solubilization of polar oils in surfactant self-organized structures, J COLL I SC, 236(1), 2001, pp. 78-84
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF COLLOID AND INTERFACE SCIENCE
ISSN journal
0021-9797 → ACNP
Volume
236
Issue
1
Year of publication
2001
Pages
78 - 84
Database
ISI
SICI code
0021-9797(20010401)236:1<78:SOPOIS>2.0.ZU;2-H
Abstract
The cloud temperature of 2 wt% C12EO8 aqueous solutions decreases upon addi tion of sarcosinate-lauroyl isopropyl (SLIP), 1-dodecanol, and nt-xylene, w hereas it increases in glycerol tris(2 ethylhexanoic) ester (TEH), isopropy l myristate (IPM), and saturated hydrocarbon systems. A three-phase microem ulsion is formed at equal weights of water and oil in the IPM system, but a lamellar liquid crystal (L-alpha) is present in the SLIP system at the bal anced temperature. The effect of added oil on the phase transition of the h exagonal (H-1) phase was also investigated by means of SAXS study. The HI-L , transition occurs upon addition of SLIP or 1-dodecanol whereas the H-1-I- 1 (discontinuous micellar cubic) phase transition takes place in TEH or IPM systems. These differences in phase behavior are attributed to the placeme nt of solubilized oil in micelles: In the former systems, oil tends to pene trate in the surfactant palisade layer and induces the surfactant layer cur vature in micelles to be less positive, while the penetration tendency is s mall and the opposite effect on the curvature is induced upon addition Of t he latter oils. (C) 2001 Academic Press.