Volumetric, acoustic and transport properties of binary mixtures of benzyldimethylammonium based ionic liquids with N,N-dimethylformamide at temperature from 293.15 to 328.15K
作者:Dasthaiah Keshapolla、Vickramjeet Singh、Ramesh L. Gardas
DOI:10.1016/j.molliq.2014.09.030
日期:2014.11
The experimental density, rho, speed of sound, u and viscosity, eta values as a function of ionic liquid concentration, m for binary mixtures (benzyldimethylammonium propionate/benzyldimethylammonium hexanoate + N,N-dimethylformamide) were measured at T = 293.15 to 328.15 K and at atmospheric pressure. Apparent molar volumes, V-phi and apparent molar isentropic compressibilities, K-s,K-phi, have been determined from the experimental densities and speed of sound and fitted to a Redlich-Mayer equation for the calculation of limiting parameters (V-phi(infinity), and K-phi(infinity)). The calculated V-phi(infinity) and K-phi(infinity) values indicate that ionic liquid-molecular solvent interactions are stronger for benzyldimethylammonium hexanoate (BDMAH) in DMF than the benzyldimethylammonium propionate (BDMAP) in DMF mixtures. The limiting apparent molar expansibilities, alpha at each temperature for both ionic liquids in DMF have positive values. The viscosity data have been analyzed using the Jones-Dole equation, and the derived parameters B and A have also been interpreted in terms of ion-solvent and ion-ion interactions. (C) 2014 Elsevier B.V. All rights reserved.