Viscoelastic, Surface, and Volumetric Properties of Ionic Liquids [BMIM][OcSO₄], [BMIM][PF₆], and [EMIM][MeSO₃]

Abstract

Thermophysical properties viz. surface tension, viscosity, density, and ultrasonic velocity of three ionic liquids 1-butyl-3-methyl imadazolium octyl sulfate [BMIM][OcSO 4 ], 1-butyl-3-methyl imadazolium hexafluorophosphate [BMIM]-[PF 6 ], and 1-ethyl-3-methyl imadazolium methanesulfonate [EMIM][MeSO 3 ] have been measured in a wide temperature range. Experimental data so obtained have been used to calculate isentropic compressibility, isothermal expansion coefficient, surface entropy, surface enthalpy, and critical temperature (temperature where the distinction between liquid and gas phase vanishes and the surface tension tends to zero). Structure−property correlation for different ILs is also discussed.

Self-Diffusion Coefficients and Related Transport Properties for a Number of Fragile Ionic Liquids

“…For [EMIM]­[CH 3 SO 3 ] [Figure S1­(a)], there is good agreement within the combined uncertainties with the results of Hasse et al; the data of Ficke et al are offset higher, by about 1.8 × 10 –3 g·cm –3 , more than the combined uncertainties, at lower temperatures, but they rapidly deviate to lower densities at higher temperatures (thus, these should be disregarded); those of Blesic et al are systematically lower; and those of Singh et al lie much higher than the other data sets (∼8–12 × 10 –3 g·cm –3 ) and can also be discounted.…”

Characterization of Six Hygroscopic Ionic Liquids with Regard to Their Suitability for Gas Dehydration: Density, Viscosity, Thermal and Oxidative Stability, Vapor Pressure, Diffusion Coefficient, and Activity Coefficient of Water

“…Moreover, the densities of the six ionic liquids differ only very slightly from each other, for example, from about (1.20 to 1.26) g·cm –3 at 293.2 K. For all four investigated ILs, the deviations of the experimental density data from their correlation according to eq lie clearly within the standard uncertainty of the density of 0.001 g·cm –3 . The experimentally determined densities of the ILs [DMIM]­[DMPO 4 ] and [EMIM]­[MeSO 3 ] were compared with the literature ,− (see Supporting Information, Figures S1 and S2). It shows that the experimental data of [DMIM]­[DMPO 4 ] and [EMIM]­[MESO 3 ] are in good agreement with the literature data.…”

Effect of added ionic liquids on the solubility and viscosity of dilute ionomer solutions in tetrahydrofuran

“…As ILs are known to be viscous, their effect on the solution viscosity was first determined using neutral polymer samples. In this case, viscosities of PS in solvent mixtures of THF/EMIM‐TF and THF/BMIM‐PF 6 were compared to the viscosity of PS in pure THF.…”

“…For these applications, replacement of water with ILs leads to better performance at higher temperatures. ILs are salts with melting points often lower than room temperature due to weakly associated cations and anions, and have desirable properties, such as the ability to solubilize many compounds and high thermal/chemical stability . Combinations of many different cations and anions are possible, offering great variability in properties.…”

“…Combinations of many different cations and anions are possible, offering great variability in properties. ILs are also used as solvents for polymerization and can be incorporated into polymers …”