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Studies on Middle‐Phase Microemulsions of Green Surfactant n ‐Dodecyl Polyglucoside C 12 G 1.46
Author(s) -
JinLing Chai,
ChangJu Wu,
GanZno Li,
GaoYong Zhang
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.20030210108
Subject(s) - microemulsion , chemistry , pulmonary surfactant , phase (matter) , alkyl , cyclohexane , aqueous solution , chemical engineering , surface tension , aqueous two phase system , organic chemistry , thermodynamics , biochemistry , physics , engineering
The three‐phase behavior in the quaternary system of n ‐dodecyl polyglucoside C 12 G 1.46 /1‐butanol/cyclohexane/water has been studied at 40°C in terms of the variables γ and δ. Increasing δ at constant γ causes a phase inversion from an oil‐in‐water microemulsion in contact with excess oil (winsor I or 2) to a water‐in‐oil microemulsion in contact with excess water (winsor II or 2 − ) via a middle‐phase microemulsion in contact with excess oil and water (winsor III or 3). By taking into account the different solubilities of alkyl polyglucoside and 1‐butanol in the oil phase, the composition of the hydrophile‐lipophile balanced interfacial film in the middle of the three‐phase body can be calculated. The effects of different oils and aqueous media on the phase behavior and on the composition of the interfacial film and the efficiency for alkyl polyglucoside to make equal weights of water and oil to a single phase were investigated. It was found that the oil molecules with small molecular volumes can improve the solubilizing efficiency of the surfactant to form single‐phase microemulsion. In inorganic salt (NaCl) and add (HCl) solutions, less 1‐butanol is needed than that in alkali (NaOH) solution to form middle‐phase microemulsion.