Journal
JOURNAL OF SURFACTANTS AND DETERGENTS
Volume 13, Issue 4, Pages 475-484Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11743-010-1186-7
Keywords
Water-in-oil microemulsion; Surfactant; Cosurfactant; Structural parameter; Thermodynamic parameters; Dilution technique
Funding
- University Grants Commission, New Delhi, India
- UGC
- Indian National Science Academy
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Interfacial behavior, structural and thermodynamic parameters of a water/(surfactant+n-butanol)/n-heptane water-in-oil (w/o) microemulsion have been investigated using the dilution technique at different temperatures, and [water]/[surfactant] mole ratios. The cationic surfactants used were alkyltrimethyl ammonium bromides (CnTAB, n = 10, 14 and 16) while the nonionic surfactants were polyoxyethylene (20) sorbitan monoalkanoates (polysorbate), viz., palmitate (PS 40), stearate (PS 60) and oleate (PS 80). The distribution of cosurfactant between the oil-water interface and the bulk oil at the threshold level of stability, and the thermodynamics of transfer of the cosurfactant from the bulk oil to the interface were evaluated. Structural parameters such as the dimensions, population density and effective water pool radius of the dispersed water droplets in the oil phase and the interfacial population of the surfactant and cosurfactant have been evaluated in terms of the surfactant chain length.
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