Abstract
Density ρ, refractive index nD, and viscosity η for ionic liquids [Cnmim]Cl (Cnmim = 1-alkyl-3-methylimidazolium; n = 2, 4, 6, 8 for ethyl, butyl, hetyl, and octyl) + N,N-dimethylformamide (DMF) binary systems have been investigated at atmospheric pressure from 288.15 K to 318.15 K. The molar excess Gibbs energy ΔG*E, volumetric properties including excess molar volume VE, and apparent molar volume Vφ,i have been calculated from the experimental data. Furthermore, the refractive index and viscosity deviations (ΔnD, Δη) from the ideal behavior have been obtained and well fitted to the Redlich–Kister equation. Our results show that DMF can effectively adjust the physicochemical properties of 1-alkyl-3-methylimidazolium ionic liquids.
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