Affiliation: | 1. Key Laboratory for Colloid and Interface Chemistry of the Ministry of Education, Shandong University, Jinan 250100, China;Department of Chemistry, Shandong Normal University, Jinan 250014, China 2. Key Laboratory for Colloid and Interface Chemistry of the Ministry of Education, Shandong University, Jinan 250100, China 3. Key Laboratory for Colloid and Interface Chemistry of the Ministry of Education, Shandong University, Jinan 250100, China;China Research Institute of Daily Chemical Industry, Taiyuan 030001, China 4. Langmuir Center for Colloids and Interfaces, Columbia University, New York 10027, USA 5. China Research Institute of Daily Chemical Industry, Taiyuan 030001, China |
Abstract: | The microemulsion behavior in the quaternary system alkyl polyglucoside (C8G1.46, C10G1.54)/1-butanol/cyclohexane/water has been studied at 40°C with the alcohol concentration scanning and the fishlike phase diagram methods. Increasing δ at a constant γ causes a phase inversion from an oil-in-water microemulsion in contact with excess oil (Winsor 1 or 2l- ) 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 using the simple mass balance equation and the HLB plane equation, the mass fraction of 1-butanol in the interfacial layer, S 2 s , the monomeric solubilities of APG and 1-butanol, S1 and S2, in the oil phase, and the mass fractions of APG and 1-butanol in the interfacial layer (C1 and C2) have been calculated, respectively. The effects of different alcohols, aqueous media and oils on the phase behavior and the composition of the interfacial layer are also investigated. It is found that the alcohols with longer hydrocarbon chain, oil molecules with smaller molecular volume and the addition of inorganic salt can increase the solubilization of the microemulsions. |