Prediction of the Thermal Conductivity of Ionic Liquids Based on Measurements with a Guarded Parallel Plate Instrument

Abstract

A guarded parallel plate instrument with an estimated measurement uncertainty (k = 2) below ±3% was used to determine the thermal conductivities of seven ionic liquids (ILs) based on the cation [EMIM] (1-ethyl-3-methylimidazolium) and four ILs based on the anion [NTf2] (bis(trifluoromethylsulfonyl)imide) for temperatures ranging from 273.15 to 353.15 K at atmospheric pressure. With the corresponding data, a simple relation between the thermal conductivity, molar mass, and density of the ILs at constant temperature was found, representing a convenient tool for the estimation of the thermal conductivities of arbitrary ILs.