Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

ABSTRACT

New experimental data on the viscosity,yenc(T), heat capacity C (T) P , speed of sound c(T), and density yenn(T)of 1-Butyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate [BMIM][FAP] are reported that allow the development of wide range reference correlation. The measurements have been made at atmospheric pressure over a temperature range from (263 to 414) K for the viscosity (yenc), from (273 to 413) K for the heat capacity ( P C ), from (273 to 413) K for the density (yenn ), and from (283 to 343) K for the speed of sound ( c ) using various type of commercial instruments.The combined expanded uncertainty of the viscosity, heat capacity, speed of sound, density, and temperature measurements at the 95 % confidence level with a coverage factor of k = 2 is estimated to be 0.35 % and 1.0 % (for two different instruments), 1.5 %, !3/4 0.5 m!$s-1, (0.05 to 0.3) kg!$m-3, and 0.05 K, respectively. These new experimental data were used to develop a wide range correlation for the viscosity based on theoretically confirmed Vogel-Tamman-Fulcher (VTF) model. The value of the glass temperature ( g T ) for the IL was estimated using the VTF parameters derived from the present viscosity measurements. Measured values of density, heat capacity, and speed of sound were used to calculate other very important thermodynamic properties, S k , T k , P yena , V yena , H , V C , T P H y. . .. . !O !O , and T V U y. . .. . !O !O .