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Issue 7, 2004
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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.

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Publication details

The article was received on 11 Feb 2004, accepted on 09 Apr 2004 and first published on 06 May 2004


Article type: Paper
DOI: 10.1039/B402145M
Analyst, 2004,129, 569-573

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    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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