Thermophysical properties of ionic liquids and their mixtures from a new equation of state

Abstract

In our previous work, a perturbed hard-trimersphere equation of state (PHTS EOS) was developed for modeling the phase equilibria of pure ionic liquids (ILs) (M.M. Alavianmehr et al., Ionics 22 (2016) 2447-2459. In this work, we have successfully extended the model to the mixtures of IL + IL and IL + solvent. Two temperaturedependent parameters appearing in the EOS are correlated with two microscopic scaling constants σ, the effective hardsphere diameter, and ε, the non-bonded interaction energy. The overall average absolute deviation (AAD) of the estimated densities from the literature data using the proposed model with and without non-additivity parameter (λ ij ) was found to be 0.44 and 0.79%, respectively. A modified Enskog equation and rough hard-sphere (RHS) theory are combined with our proposed equation of state to calculate the viscosity coefficient of ionic liquids and their mixtures. Finally, from the results obtained, a linear relation between logarithm of surface tension and viscosity property of ionic liquid was developed.

Thermophysical Properties of Newly Synthesized Ammonium-Based Protic Ionic Liquids: Effect of Temperature, Anion and Alkyl Chain Length

“…Therefore, there is a need for systematic thermodynamic and thermophysical measurements for ILs to highlight their availability for use at the industrial processes level. Furthermore, these experimental thermophysical properties of ILs would allow the improvement of overall quality and reliability of the ILs in any applications [30].…”

Influence of Pyrrolidinium-Based Ionic Liquid on the Interfacial Activity and Droplet Leaf Surface Wettability of Nitenpyram: Experimental and Theoretical Approach

“…For IL in the presence of NTP, the cmc value initially declines at 303 K followed by an increase at 308 and 313 K. Hence, overall, there is an increase in the cmc values at higher temperatures for both IL and IL-NTP systems. As seen in Figures and S1, at higher temperature values, surface tension is found to decrease linearly which is as expected and reported in the literature as well …”

“…As seen in Figures 1 and S1, at higher temperature values, surface tension is found to decrease linearly which is as expected and reported in the literature as well. 50 As for the interfacial parameters, the maximum surface excess concentration (Γ max ), was calculated using the Gibbs adsorption isotherm, as given below in eq 1, and gives information regarding the IL concentration adsorbed at the interface in terms of the number of molecules per unit area.…”