Based on the dimensional analysis ρ-u- thermodynamic and ρ-u- optical properties correlations have been applied
to sixteen ionic liquids at different temperatures. The objective of the present work is to employ these relations to ionic
liquids. The experimental values of ρ and u have been reported in the literature at different temperatures. We have computed
thermal expansivity (α), isothermal compressibility (βT), heat capacities ratio (γ), internal pressure (Pint), pseudo-Grüneisen
parameter (Г), energy of vaporization (ΔEV), enthalpy of vaporization (ΔHV), cohesive energy density (ced), solubility parameter (δ), refractive index (n), molar refraction (RM) and polarisability (αp) for these liquids. Results are found to quite
satisfactory. Keeping in view of uncertainty in the experimental values of ρ and u, as well as some approximations used, the
agreement between experimental and theoretical values is found to be quite satisfactory. The results are discussed critically.
Introduction:
In the present work, we are applying the ρ-u thermodynamic and ρ-u- optical properties correlations to sixteen
ionic liquids to estimate thermodynamic and optical properties at different temperature. The experimental values of ρ and u
have been reported in the literature at different temperatures. We have computed α, βT, γ, Pint, Г, ΔEV, ΔHV, ced, δ, n, RM
and αp for these liquids.
Method:
Correlations between density-sound velocity and several thermodynamic properties have been derived on the basis
of dimensional analysis On the basis of dimensional analysis, a number of useful and important thermodynamic relations
were deduced in terms of density (ρ) and speed of sound (u).
Result:
Results are found to quite satisfactory. Keeping in view of uncertainty in the experimental values of ρ and u, as well
as some approximations used, the agreement between experimental and theoretical values is found to be quite satisfactory.
Discussion:
Density (ρ) and ultrasonic speed (u) data of sixteen RTILs at different temperatures have been taken from the
literature. Calculated values of α, βT, Pint, γ, CP-CV, and, Г obtained from empirical relations. The experimental values of α
are given for making a comparative study.
Conclusion:
Based on the dimensional analysis our recently developed correlations between ρ-u- thermodynamic and ρ-uoptical properties have been found to be quite successful when applied to sixteen ionic liquids for the first time. α, βT, γ,
Pint, ΔEVap, ΔHVap, ced, δ as well as RM and αp were calculated at various temperatures.
Membrane Separation of Gaseous Hydrocarbons by Semicrystalline Multiblock Copolymers: Role of Cohesive Energy Density and Crystallites of the Polyether Block
