文摘
The density (d) and speed of sound (u) for the binary systems were measured at 298.15, 303.15, 308.15, and 313.15 K under atmospheric pressure. The binary systems contained the ionic liquid (IL): methyltrioctylammoniumbis(trifluoromethylsulfonyl)imide ([MOA]+[Tf2N]?). The binary systems were ([MOA]+[Tf2N]? + ethyl acetate or ethanol). The apparent molar volume, V¦Õ, and the apparent molar isentropic compressibility, k¦Õ, have been evaluated from the experimental density and speed of sound data, respectively. A Redlich-Mayer equation was fitted to the apparent molar volume and apparent molar isentropic compressibility data. The partial molar volume, , and partial molar isentropic compressibility, , of the binary mixtures have also been calculated at each temperature. The partial molar volume indicates that the intermolecular interactions for (IL + ethanol) are stronger than for (IL + ethyl acetate) at all temperatures and for both systems increases with an increase in temperature. The values of the infinite dilution apparent molar expansibility, , decreases with an increase in temperature. The isentropic compressibilities, ks, increases with an increase in temperature for both binary systems. Positive , for both binary systems can be attributed to the predominance of solvent intrinsic compressibility over the solute intrinsic effect.
