The Effect of Fatty Acid on Phase Behaviors of Tween 80/bmimPF_6/toluene Microemulsions

摘要

Pseudo ternary phase diagrams of bmimPF_6/Tween80/fatty acid/toluene systems were constructed with different linear-chain fatty acid. The results demonstrated that when surfactant/fatty acid weight ratio increased, the microemulsion domain became larger, but was less than that in the absence of fatty acid. Moreover, the different chain length of fatty acid affected the extent of microemulsion region, and medium-chain length of fatty acid maximized the single-phase area of bmimPF_6-based microemulsion. In addition, the influence on the microstructure of the single-phase area in the different linear-chain length fatty acids was conducted by studying the electrical conductivity behavior. Preliminary investigation suggested that the O/IL (oil /ionic liquid) microemulsion in the presence of C_5H_(11)COOH and the IL/O (ionic liquid/oil) microemulsion in the presence of C_3H_7COOH were max.