LAUSR

Abstract Interfacial tensions of sixteen systems (pyridinium-based ionic liquid + n-alkane or n-alkanol) have been measured in the temperature range (283.15–313.15) K and at pressure of 0.1 MPa. The ionic liquids used were: 1-butylpyridinium tetrafluoroborate, 1-butyl-2-methylpyridinium tetrafluoroborate, 1-butyl-3-methylpyridinium tetrafluoroborate, and 1-butyl-4-methylpyridinium tetrafluoroborate. On the other hand, the organic solvents were: n-hexane, n-octane, n-hexanol, and n-octanol. The surface tensions of the organic liquids were also measured. The interfacial tensions for the systems involving n-alkanes are higher than for the systems containing n-alkanols. All the interfacial tensions decrease linearly with temperature. In addition the results have been interpreted using the equation proposed by Girifalco and Good.