Volumetric properties of three pyridinium-based ionic liquids with a common cation or anion

Thermophysical Study of Pyridinium-Based Ionic Liquids Sharing Ions

“…In general, the agreement of our density results with those presented in the literature is reasonable, especially for [bpy]­[Tf2N] and [hpy]­[BF4] (AARD values lower than 0.1%), although for [bpy]­[Tf2N], two papers present higher deviations. For the case of [hpy]­[Tf2N], the deviations in density are larger than that for the other two ionic liquids, with the results from Bounsiar et al and Bittner et al being the closest to our results. In the work of Oliveira et al, two sets of density values measured using a vibrating tube densimeter, are presented, one for dry liquids and the other one for liquids saturated with water, our experimental values fall between these two sets of values.…”

“…In general, the agreement of our density results with those presented in the literature is reasonable, especially for [bpy][Tf2N] and [hpy][BF4] (AARD values lower than 0.1%), although for [bpy][Tf2N], two papers present higher deviations. For the case of [hpy][Tf2N], the deviations in density are larger than that for the other two ionic liquids, with the results from Bounsiar et al 5 and Bittner et al 17 14 it can be noted that the densities were measured by a Westphal balance instead of the usual vibrating tube densimeter. For the rest of the properties of the ILs studied, for which we have indicated that there are fewer studies, the concordance is also reasonable; for the surface tension, the biggest deviation of 7.6% occurs with the data of Bittner et al, 17 and for the dynamic viscosity, the largest deviation of 16% is shown by the work of Oliveira et al 10 It can be outlined that the largest deviations occur in the case of electrical conductivities with an average deviation of 12%, and these deviations are higher at low temperatures where the conductivities are smaller.…”

“…In a previous paper, the ρpT behavior of these ionic liquids was reported. 5 The densities were measured using an Anton Paar DMA HP cell with an Anton Paar DMA 5000 acting as the evaluation unit. The experimentally obtained raw densities were corrected using estimated viscosities, according to the method proposed by Sanmamed et al 6 While the densities presented in this work were measured with an Anton Paar DSA 5000 that automatically corrects the viscosity errors in the density.…”

“…In a previous paper, the ρpT behavior of these ionic liquids was reported . The densities were measured using an Anton Paar DMA HP cell with an Anton Paar DMA 5000 acting as the evaluation unit.…”

Deep Eutectic Solvents: Are They Safe?

“…ILs present interesting properties, such as low vapor pressure, high thermal, chemical, and electrochemical stability, being non-flammable [5][6][7], and the ability to dissolve or extract several chemicals (organics and inorganics; polar and nonpolar) [8], and can be used in separations [9] or as catalysts, among other important properties [10][11][12]. It should be noted that these characteristics are not common to all ionic liquids, and properties depend on the ions.…”