Ion speciation: a key for the understanding of the solution properties of ionic liquid mixtures

Abstract

Unexpected ion speciation of ionic liquid mixtures in aqueous solution is the key to ionic liquids’ solution properties.

Isopiestic Studies on Mixed Ionic Liquid Aqueous Solutions at 298.15 K

“…33 The VLE data of IL1 + IL2 + water is rare in the literature. 32,34 In fact, in the present work, for the first time, the effect of anion on the VLE behavior of IL + IL + water systems was investigated by the isopiestic method. The imidazolium class of ionic liquid is the most studied because of its air and moisture stability.…”

“…As a continuation of that work, in the present study, ionic liquids with the same cations and different anions were selected and the improved isopiestic method was used to obtain the water activity of the aqueous solutions of ternary IL1 + IL2 mixtures as well as their binary subsystems . The VLE data of IL1 + IL2 + water is rare in the literature. , In fact, in the present work, for the first time, the effect of anion on the VLE behavior of IL + IL + water systems was investigated by the isopiestic method. The imidazolium class of ionic liquid is the most studied because of its air and moisture stability.…”

Deep Eutectic Solvents or Eutectic Mixtures? Characterization of Tetrabutylammonium Bromide and Nonanoic Acid Mixtures

“…Each of the ions was optimized separately, and the salt was treated as a mixture of two ions with an appropriate molar ratio, according to the previous study. 33 The sigma profile surfaces are presented in Figure S1 . In this approach, ions are treated at the quantum chemical level separately, which allows studying the contribution of both the cation and anion to predict the interaction in the DES mixture.…”

Soluting Effect in Ternary Aqueous Solutions of Ionic Liquids by Isopiestic Equilibrium Studies and Applying the Linear Isopiestic Relations for Estimating Their Speed of Sound, Density, and Surface Tension Data

“…Ionic liquids (ILs), which are the organic salts with melting points lower than 373.15, have unique properties, such as negligible vapor pressure, low melting point, high thermal stability, a wide liquid range, wide electrochemical window, and their capability to dissolve both polar and nonpolar compounds. − It is possible to design different ionic liquids with various properties by coupling different anions and cations, which has led to a very wide range of industrial applications. , Knowledge of the vapor–liquid equilibria (VLE) of aqueous solutions is of practical and theoretical interest to determine the thermodynamic properties of these systems and in the elucidation of solute–solute and solute–water interactions as well as in the design of industrial separation and purification processes. One of the methods to investigate the VLE properties in solutions with one volatile component is the isopiestic method which provides useful information for understanding the soluting effect in aqueous solutions. , Although the VLE properties of binary IL + solvent, , ternary IL + solvent 1 + solvent 2, and IL + solute + solvent − systems have been studied extensively, the VLE data for ternary IL1 + IL2 + water systems are very rare in the literature . In the first part of this work, the isopiestic equilibrium concentrations were obtained for ternary IL1 + IL2 aqueous solutions as well as their binary IL1 + water and IL2 + water subsystems.…”

“…7,8 Although the VLE properties of binary IL + solvent, 9,10 ternary IL + solvent 1 + solvent 2, 11 and IL + solute + solvent 12−14 systems have been studied extensively, the VLE data for ternary IL1 + IL2 + water systems are very rare in the literature. 15 In the first part of this work, the isopiestic equilibrium concentrations were obtained for ternary IL1 + IL2 aqueous solutions as well as their binary IL1 + water and IL2 + water subsystems. For a comparative study of the effects of the side alkyl chain length of cations on the VLE, different systems, including {[C 6 MIM]Br + [C 2 MIM]Br + water}, {[C 2 MIM]Br + [C 4 MIM]Br + water}, and {[C 4 MIM]Br + [C 6 MIM]Br + water}, were selected.…”