Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 336, Issue 1-3, Pages 18-22Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2008.11.011
Keywords
Ionic liquid; Lyotropic liquid crystalline (LLC); Ionic surfactant; SAXS
Categories
Funding
- Natural Science Foundation of China [20773081]
- National Basic Research Program [2007CB808004]
- Natural Science Foundation of Shandong Province [Z2007B06]
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS
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The phase diagram of ternary mixtures of 1-dodecyl-3-methylimidazolium bromide (C(12)mimBr)/1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF(4))/H2O is constructed at 25 degrees 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)/H2O. 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(12)mimBr system than in the DTAB system could be concluded from the SAXS and rheological measurements. (C) 2008 Elsevier B.V. All rights reserved.
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