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Phase behavior and dielectric spectroscopy of the sodium dodecyl trioxyethylene sulfate/ n ‐butanol/water system
Author(s) -
Wei SuXiang,
Mu JianHai,
Zhao KongShuang,
Lei JianPing,
Li GanZuo
Publication year - 2003
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20030211011
Subject(s) - chemistry , micelle , sodium dodecyl sulfate , analytical chemistry (journal) , conductivity , phase diagram , dielectric , phase (matter) , relaxation (psychology) , microemulsion , ternary operation , chromatography , pulmonary surfactant , aqueous solution , organic chemistry , materials science , psychology , social psychology , biochemistry , optoelectronics , computer science , programming language
The phase diagram of the ternary system of sodium dodecyl trioxyethylene sulfate (SDES)/ n ‐butanol/water is obtained at (30.0 ± 0.1) °C. There exists a clear, isotropic, and low‐viscosity L phase, which could be divided into W/O micelle, bi‐continuous (B. C.) phase and O/W micelle by conductivity measurements. Dielectric Relaxation Spectroscopy (DRS) measurements are applied to investigate microstructure changes of this system. For samples with a fixed weight ratio, SDES/ n ‐butanol = 3/7, DRS indicates a structure transition from W/O to O/W micelles via B.C. phase with the increase of water content. For the samples with a fixed weight ratio, SDES/H 2 O = 4/6, DRS can presents that there exist changes of onefold structure size of W/O micelles as n‐butanol content increases. The results obtained from DRS and their analyses are in good agreement with those from phase diagram and conductivity measurements.