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RESEARCH ARTICLE
Contents Vol 70(1)

Rheopectic Gel Formation of Stimuli-Responsive Ionic Liquid/Water Mixtures

Yukinobu Fukaya A , Takuro Nakano A and Hiroyuki Ohno A B C
+ Author Affiliations
- Author Affiliations

A Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan.

B Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan.

C Corresponding author. Email: ohnoh@cc.tuat.ac.jp

Australian Journal of Chemistry 70(1) 74-78 https://doi.org/10.1071/CH16228
Submitted: 9 April 2016  Accepted: 30 May 2016   Published: 27 June 2016

Abstract

A new class of hydrophobic and polar ionic liquids was prepared by coupling hydrophobic tetraoctylphosphonium cation and polar phosphonate-derived anions. Mixtures of these ionic liquids and water showed lower critical solution temperature-type phase behaviour. Furthermore, these mixtures displayed thermoreversible, however, non-linear viscosity change despite their large content of water. The abrupt increase in the viscosity was explained by the occurrence of rheopectic gelation of the ionic liquid/water mixtures by external stimuli such as shear stress.


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