Experimental and theoretical study on ion association in [Hmim][halide] + water/isopropanol mixtures

New Electrical Conductivity Model for Electrolyte Solutions Based on the Debye–Hückel–Onsager Theory

“…Figure 9 shows that the predicted molar conductivity, assuming full dissociation, deviates greatly from the exper-Table 7. Ionic Conductivity at Infinite Dilution (λ i 0 ) in S m 2 mol −1 and Ionic Diameter (σ i ) in m for Ionic Liquids Studied in This Work 72,73 imental measurements. This is an expected outcome, as in ILco-solvent solutions, ion−ion association is very active.…”

“…Molar conductivity of [C 6 MIM]Cl aqueous solutions predicted by the model 3 where ion pairing is (solid lines) and is not (dashed lines) considered (symbols are experimental measurements from ref ).…”

“…Ionic Conductivity at Infinite Dilution (λ i 0 ) in S m 2 mol −1 and Ionic Diameter (σ i ) m for Ionic Liquids Studied in This Work72,73 …”

New Local Composition Model for Correlating of the Molar Conductivity of Ionic Liquid–Solvent Systems over the Whole Concentration Range

“…16 Although the above models can successfully describe the relationship between Λ m and η or D of pure ILs, their research ideas do not directly extend to describe the relationship of Λ m of IL−solvent systems with the composition, due to the fact that solvents modulate Λ m of IL− solvent systems by changing the degree of dissociation and association of ILs through cation−anion and ion−solvent interactions. 17 Although the well-known Debye−Huckel− Onsager equation has been generalized to correlate Λ m of IL−solvent systems with composition, and the linear relationship between Λ m and the square root of the concentration has been used to extrapolate to obtain the limiting molar conductivities of IL (Λ m ∞ ), 18 the model is only applicable to the solvent-rich region and not to the whole concentration range. However, ILs as the electrolytes are often used in the salt-rich region, 19 which is beyond the concentration range of the traditional electrolyte models, resulting in an apparent deviation of the relationship between Λ m and concentration from linearity.…”