Excess Enthalpies of Mixing, Effect of Temperature and Composition on the Density, and Viscosity and Thermodynamic Properties of Binary Systems of {Ammonium-Based Ionic Liquid + Alkanediol}

Abstract

In the present work the excess enthalpies of butyltrimethylammonium bis(trifluoromethyl-sulfonyl)imide, [N1114][NTf2], with 1,2-propanediol, or 1,2-butanediol, or 2,3-butanediol have been measured at T = 298.15 K. Additionally, the density, ρ, and dynamic viscosity, η, for binary solutions containing ionic liquids (ILs) and alkanedioles, {butyltrimethylammonium bis(trifluoromethyl-sulfonyl)imide, [N1114][NTf2], + 1,2-propanediol, 1,2-butanediol, 2,3-butanediol} and {(2-hydroxyethyl)trimethylammonium bis(trifluoro-methylsulfonyl)imide, [N1112OH][NTf2], + 1,2-propanediol, 1,3-propanediol, 1,5-pentanediol}, at wide temperature and composition ranges at ambient pressure have been investigated. From experimental values of the density, ρ, and dynamic viscosity, η, the excess molar volumes, V(E), and dynamic viscosity deviations, Δη, were calculated and correlated using the Redlich-Kister polynomial equation. The temperature dependence of density and viscosity for the tested binary systems was described by an empirical second-order polynomial and by the Vogel-Fucher-Tammann equation, respectively. The variation of density and viscosity as a function of composition has been described by the polynomial correlations. Comparison of the experimental results for the binary mixtures tested in this work allows us to determine the influence of alkanediol carbon chain length, the position of the hydroxyl group in the alcohol, and the influence of the structure of the cation of the ionic liquid on the presented properties.

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

“…Our density results for [EMIM][FAP] [ Figure S1(d)] are in excellent agreement with the vibrating-tube results of Liu et al, 43 those of Nazet et al, 44 47 and of Domanśka et al 48 [ Figure S1(e)].…”

Densities, Viscosities, Refractive Indices, and Excess Properties of Aqueous 1,2-Etanediol, 1,3-Propanediol, 1,4-Butanediol, and 1,5-Pentanediol Binary Mixtures

“…The volumetric and viscometric properties as well as excess enthalpy of mixing for ammonium-based ionic liquid + alkanediol systems were studied by Domanska and co-workers. 15 The results indicated that the densities and viscosities increase with an increase of IL mole fraction and decrease of temperature. Moreover, they obtained the positive values of excess molar volume and excess enthalpy with the negative viscosity deviations.…”

“…Both excess molar volume and excess heat capacity increase with an increase of temperature. The volumetric and viscometric properties as well as excess enthalpy of mixing for ammonium-based ionic liquid + alkanediol systems were studied by Domanska and co-workers . The results indicated that the densities and viscosities increase with an increase of IL mole fraction and decrease of temperature.…”

Density, viscosity and excess properties in the trihexyltetradecylphosphonium chloride ionic liquid/methanol cosolvent system

“…With regard to physicochemical properties of ILs and (IL + cosolvent) binary mixtures a common thread runs through many recent reports. From measurements of density [34][35][36][37][38][39][40][41][42], viscosity [6,40,41,43], conductivity [37,41,44,45], sound velocity [36], refractive index and enthalpy [46,47], excess properties are often computed as a means by which the nature of molecular interactions in mixtures can be interpreted. For example, Anouti and co-workers used volumetric, conductivity, and transport properties to characterize the (pyrrolidinium nitrate + propylene carbonate) binary mixture and they reported several thermodynamic properties for these mixtures [41].…”