Heat capacities and electrical conductivities of 1-n-butyl-3-methylimidazolium-based ionic liquids

Here we presented the heat capacities and electrical conductivities of four [Bmim (1-n-butyl-3-methylimidazolium)]-based ionic liquids. The heat capacities were measured using a differential scanning calorimeter in the temperature range from 303.2 to 358.2K. The electrical conductivities were measured over temperature range from 293.2 to 353.2K using conductivity meter. The estimated uncertainties of heat capacity C-p and electrical conductivity sigma measurements were +/- 2% and +/- 1%, respectively. The measurements were presented as a function of temperature. The temperature dependency of the C-p value was correlated using an empirical equation. A modified version of Vogel-Tamman-Fulcher equation was employed to describe the temperature dependency of sigma values. The correlations give satisfactory results. The presented results were in good agreement with the available literature data. (C) 2008 Elsevier B.V. All rights reserved.