Hexagonal liquid crystalline phases formed in ternary systems of Brij 97-water-lonic liquids

被引：106

作者：

Wang, ZN ^{[1
]}

Liu, F

Gao, Y

Zhuang, WC

Xu, LM

Han, BX

Li, GZ

Zhang, GY

机构：

[1] Shandong Univ, Key Lab Colloid & Interface Chem, Minist Educ, Jinan 205100, Peoples R China

[2] Chinese Acad Sci, Ctr Mol Sci, Inst Chem, Beijing 100080, Peoples R China

来源：

LANGMUIR | 2005年 / 21卷 / 11期

关键词：

D O I：

10.1021/la050266p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Phase diagrams of two ionic liquids: hydrophobic 1-butyl-3-methylimidazolium hexafluorophosphate (bmim-PF6) and relatively hydrophilic 1-butyl-3-methylimidazolium tetrafluoroborate (bmim-BF4) in aqueous solutions of Brij 97 were determined at 25 degrees C. Two hexagonal liquid crystalline phases formed in bmim-PF6- and bmim-BF4-containing ternary systems were investigated by means of small-angle X-ray scattering (SAXS) and rheological techniques, with comparison of composition and temperature effects. From analysis of the SAXS data, bmim-PF6 is dominantly penetrated between the oxyethylene chains of surfactant molecules, whereas bmim-BF4 is mainly located in the water layer of hexagonal phases. The strength of the network of hexagonal phase formed in the Brij 97/wateribmini-BF4 system is appreciably stronger than that of the Brij 97/water/bmim-PF6 system, indicated by the smaller area of the surfactant molecule at the interface and the higher moduli (G', G"). Temperature has a converse effect on the lattice parameters of the two hexagonal phases.

引用

页码：4931 / 4937

页数：7

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