Abstract
The phase diagram of ternary mixtures of 1-dodecyl-3-methylimidazolium bromide (C 12mimBr)/1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF 4)/H 2O is constructed at 25 °C. The formed hexagonal liquid crystalline phase in the mixtures is investigated by the polarized optical microscopy (POM), small-angle X-ray scattering (SAXS), and rheology measurements in comparison with the hexagonal phase formed in the ternary system, dodecyltrimethylammonium bromide (DTAB)/bmimBF 4/H 2O. The structural parameters of the lyotropic liquid crystalline phases are calculated. The increase of the lattice parameter with the increase of the bmimBF 4 content is attributed to the location region of bmimBF 4 in the water layer of the hexagonal phase. Furthermore, the denser aggregation of the cylindrical units in the hexagonal liquid crystalline phase formed in the C 12mimBr system than in the DTAB system could be concluded from the SAXS and rheological measurements.
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