Viscosities at pressures up to 20 MPa and thermal conductivities at 0.1 MPa of 1-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]amides

The density, viscosity and thermal conductivity values are reported for a series of 1-alkyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] amide compounds, where the alkyl group is butyl ([BMIM][NTf₂]), hexyl ([HMIM][NTf₂]), or octyl ([OMIM][NTf₂]). The densities were measured with a vibrating tube densimeter over the temperature range 293-353 K at pressures up to 20 MPa. The estimated combined standard uncertainty was 0.1%. The viscosities were measured using a rolling-ball viscometer over the temperature range 293-353 K, at pressures up to 20 MPa. The combined standard uncertainty in the viscosity was estimated to be 1.6%. The experimental values were correlated with a hybrid Vogel-Fulcher-Tammann/Tait equation. The thermal conductivities were measured using the transient short hot-wire method over the temperature range 294-354 K, at 0.1 MPa. The combined standard uncertainty in the thermal conductivity was estimated to be 2.2%.