Fluorination effects on the thermodynamic, thermophysical and surface properties of ionic liquids. (June 2016)

• Record Type: Journal Article
• Authors: Vieira, N.S.M.; Luís, A.; Reis, P.M.; Carvalho, P.J.; Lopes-da-Silva, J.A.; Esperança, J.M.S.S.; Araújo, J.M.M.; Rebelo, L.P.N.; Freire, M.G.; Pereiro, A.B.
• Is Part Of: Journal of chemical thermodynamics. Volume 97(2016:Jun.)
• Page Start: 354
• Page End: 361
• Publication Date: 2016-06
• Subjects: Fluorinated ionic liquids -- Surface tension -- Physical and thermal properties -- Thermodynamic functions -- Walden plot; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2016.02.013
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: Surface tension of fluorinated ionic liquids. Thermophysical properties of fluorinated ionic liquids. Thermal properties and thermodynamic functions. Abstract: This paper reports the thermal, thermodynamic, thermophysical and surface properties of eight ionic liquids with fluorinated alkyl side chain lengths equal or greater than four carbon atoms. Melting and decomposition temperatures were determined together with experimental densities, surface tensions, refractive indices, dynamic viscosities and ionic conductivities in a temperature interval ranging from (293.15 to 353.15) K. The surface properties of these fluorinated ionic liquids were discussed and several thermodynamic functions, as well as critical temperatures, were estimated. Coefficients of isobaric thermal expansion, molecular volumes and free volume effects were calculated from experimental values of density and refractive index and compared with previous data. Finally, Walden plots were used to evaluate the ionicity of the investigated ionic liquids.