Effect of temperature and composition on the density, viscosity, surface tension, and thermodynamic properties of binary mixtures of N-octylisoquinolinium bis{(trifluoromethyl)sulfonyl}imide with alcohols

► Density and viscosity were examined for [C8iQuin][NTf2] and 3 1-alcohols. ► The surface tensions of [C8iQuin][NTf2] was measured with 1-hexanol. ► The correlation with polynomials, Redlich-Kister and V-F-T equations were presented. ► The surface thermodynamic functions were derived. ► The critical temperature, parachor, and speed of sound of IL were described.