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Interfacial Composition, Structural and Thermodynamic Parameters of Water/(Surfactant+ n ‐Butanol)/ n ‐Heptane Water‐in‐Oil Microemulsion Formation in Relation to the Surfactant Chain Length
Author(s) -
De Mrinmoy,
Bhattacharya Subhash C.,
Moulik Satya P.,
Panda Amiya K.
Publication year - 2010
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-010-1186-7
Subject(s) - chemistry , pulmonary surfactant , microemulsion , heptane , dilution , chemical engineering , chromatography , population , phase (matter) , thermodynamics , organic chemistry , biochemistry , physics , engineering , demography , sociology
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.