Abstract
Pseudo ternary phase diagrams of bmimPF6/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 bmimPF6-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 C5H11COOH and the IL/O (ionic liquid/oil) microemulsion in the presence of C3H7COOH were max.
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