Thermal Conductivities of NTf₂-Based Ionic Liquids: Experimental Measurement and Prediction via Group Contribution Methods

Abstract

Thermal conductivities of nine different bis­((trifluoromethyl)­sulfonyl)­imide-based ionic liquids (ILs), [C2mim]­[NTf2], [C4mmim]­[NTf2], [C8mim]­[NTf2], [P1,4,4,4]­[NTf2], [N1,1,1,4]­[NTf2], [N1,8,8,8]­[NTf2], [C4 3mpy]­[NTf2], [C4 4mpy]­[NTf2], and [C4mpy]­[NTf2], have been measured using the modified transient plane source method (MTPS) over the temperature range from 298 to 348 K at atmospheric pressure. The thermal conductivities of all the studied ILs are in the range of 0.120–0.150 W·m–1·K–1, with a combined expanded uncertainty of 0.01 W·m–1·K–1 at a 95% confidence level. In all cases, thermal conductivity decreases with increasing temperature and follows a linear trend, as is typical for most liquids and falls within the reported range for ILs. Two existing group contribution models (GCMs) with differing modeling philosophies have also been extended and tested against a database consisting of this new data combined with all existing IL thermal conductivity data in the literature. The extended GCMs yielded average absolute relative deviations of 5.5% and 4.9%, respectively, for the entire dataset.

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