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Issue 7, 2004

Correlation between the fluorescent response of microfluidity probes and the water content and viscosity of ionic liquid and water mixtures

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Abstract

Accurate data on transport properties such as viscosity are essential in plant and process design involving ionic liquids. In this study, we determined the absolute viscosity of the ionic liquid + water system at water mole fractions from 0 to 0.25 for three 1-alkyl-3-methylimidazolium ionic liquids: 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide and 1-ethyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide. In each case, the excimer to monomer ratio for 1,m-bis(1-pyrenyl)alkanes (m = 3 or 10) was found to increase linearly with the mole fraction of water. Of the probes studied only PRODAN and rhodamine 6G, both of which have the ability to participate in hydrogen bonding, exhibited Perrin hydrodynamic behavior in the lower viscosity bis(trifluoromethane sulfonyl)imides. As a result, these probes allow for the extrapolation of the absolute viscosity of the ionic liquid mixture from the experimental fluorescence steady-state polarization values.

Article information


Submitted
11 Feb 2004
Accepted
09 Apr 2004
First published
06 May 2004

Analyst, 2004,129, 569-573
Article type
Paper

Correlation between the fluorescent response of microfluidity probes and the water content and viscosity of ionic liquid and water mixtures

S. Pandey, K. A. Fletcher, S. N. Baker and G. A. Baker, Analyst, 2004, 129, 569 DOI: 10.1039/B402145M

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