Studies on the Interfacial Composition, Thermodynamic Properties and Structural Parameters of W/O Microemulsions Containing Surfactant-like Ionic Liquid

摘要

The interfacial composition, thermodynamic properties and structure parameters of the microemulsion systems containing surfactant-like ionic liquid have been investigated with the dilution method of the W/O microemulsions. The interfacial parameters_of X_a~i, thermodynamic properties K, -ΔG_(o->i)~o and structure parameters R_e, R_w, N_d, N_s, N_a have been calculated and discussed for microemulsion systems surfactant-like ionic liquid C_(12)mimBr (C_(14)mimBr, C_(16)mimBr) / alcohol / alkane / water. The effects of water content, alcohols, alkanes, salinity and temperature on above parameters were discussed. The results show that with the increase in salinity and the carbon chain length of both surfactant and alcohol, or with the decrease in the carbon chain length of the alkanes, the molar fraction of the alcohol at the interfacial layer (X_a~i) decreases, the formation of the microemulsion is more spontaneous in thermodynamics, and the droplets of the W/O microemulsion were enlarged. The size of the microemulsion droplets is sensitive to the water content, and increases significantly with increasing water content.