Abstract
The phase behavior of 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6], a hydrophobic ionic liquid (IL)), polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether (Triton X-100, a nonionic surfactant with a polyoxyethylene chain), and ethylene glycol (EG) ternary nonaqueous systems, was studied by dielectric relaxation spectroscopy (DRS). In single-phase region, EG-in-IL (EG/IL), bicontinuous (B.C.), and IL-in-EG (IL/EG) subregions can be identified by the dc conductivity. The inflection points of the relaxation parameters (dielectric intensity and relaxation time) are consistent with the phase boundaries between IL/EG and B.C. and B.C. and EG/IL subregions, which imply that the change of microstructure of this system can be detected by the dielectric response. Furthermore, in IL/EG microregion, phase parameters of constituent phases were calculated based on interface polarization theory. The trends of relaxation times for both of the calculated values τ MW and experimental values τ as a function of IL content in IL/EG microregion are almost the same, which infers that the dielectric relaxation originates from the interfacial polarization. This work is helpful to understand the dynamics and phase behavior of nonaqueous microemulsions.
Published Version
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