Liquid crystalline phases of 1,2-dimethyl-3-hexadecylimidazolium bromide and binary mixtures with water

Journal of Colloid and Interface Science
Cuihua LiChuanxin He

Abstract

1,2-Dimethyl-3-hexadecylimidazolium bromide, which lacks an acidic proton at the C-2 imidazolium ring position, exhibits thermotropic SmA(2) phase behavior above its melting point of 90.3 degrees C and up to 232.1 degrees C. The corresponding layer spacing and the full width at half maximum from XRD patterns display a temperature dependence. In binary mixtures with water, over a concentration range of 40-75%, lyotropic liquid crystalline phases form between 0.5 and 25 degrees C. The molecules of the new ionic liquid (IL) in the binary mixtures show three different self-assembly processes, namely, formation of rod micelles, coexistence of rod micelles and a hexagonal phase, and a pure hexagonal phase. The distance between the two centers of adjacent columns of cylinder units remains nearly constant at 4.97+/-0.04nm when the IL content exceeds 70%, indicating that the cylinder units attain a dense and highly ordered packing.

References

Apr 20, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·James BowersRichard K Heenan
Jan 16, 2007·Journal of Colloid and Interface Science·Ian GoodchildRichard K Heenan
Aug 4, 2007·Journal of Colloid and Interface Science·Guodong ZhangHuayu Qiu
Nov 13, 2007·Journal of Colloid and Interface Science·Zhongni WangGanzuo Li
Dec 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Montserrat TrillaMichel Wong Chi Man
Feb 19, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Kefeng MaRichard G Weiss

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Citations

May 4, 2011·Journal of Colloid and Interface Science·Cuihua LiZhenqiang Yu
Apr 19, 2016·Chemical Reviews·Karel GoossensKoen Binnemans

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