Investigation on thermophysical and excess properties of binary mixtures of imidazolium based ionic liquids at temperatures (293.15 to 323.15) K: III [C n mim][PF 6 ] ( n = 4, 6, 8) + THF Vaid, Z.; More, U.; Ijardar, S.P.; Malek, N.I.; The Journal of Chemical Thermodynamics 2015, 86, 143-153