Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 335, Issue 1-3, Pages 80-87Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2008.10.031
Keywords
Ionic liquid; Lyotropic liquid crystal; Ternary phase diagram; SAXS; POM; H-2 NMR; Rheology
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Funding
- National Natural Science Foundation of China [20773081]
- National Basic Research Program [2007CB808004]
- Natural Scientific Foundation of Shandong Province of China [Z2007B06]
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS
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1-Alkyl-3-methylimidazolium bromide (C(n)mimBr), are substituted for surfactants and formed lyotropic liquid crystalline phases with p-xylene and water. Small angle X-ray scattering (SAXS), polarized optical microscopy (POM), H-2 nuclear magnetic response (H-2 NMR) and rheological measurement were performed to investigate the lyotropic liquid crystalline phases. A lyotropic bicontinuous cubic phase formed in imidazolium-type ionic liquid (IL) system was found for the first time. Moreover, the effect of chain length of C(n)mimBr on the phase behavior, structural parameters and rheological properties was studied. The strong pi-pi stacking of imidazolium based ILs and their pi-cation interactions with p-xylene molecules have unique effect on the structural parameters, especially the thickness of the water channel (d(W)). (C) 2008 Elsevier B.V. All rights reserved.
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