A Functionalized High-Surface-Energy Ammonium-Based Ionic Liquid: Experimental Measurement of Viscosity, Density, and Surface Tension of (2-Hydroxyethyl)ammonium Formate

Abstract

The ammonium-based ionic liquid (2hydroxyethyl)ammonium formate has been known for ease of synthesis and great solvation properties. In this work, this ionic liquid was synthesized, and its temperature-dependent density, surface tension, and viscosity were measured. Surface tension was measured by the capillary rise method using a homemade capillary apparatus in which the liquid and vapor can be brought into equilibrium. Measurements of viscosity and surface tension were performed under a water-vapor-free atmosphere. The viscosity was measured using a capillary viscometer and found to fit the Vogel− Fulcher−Tammann (VFT) equation, indicative of a non-Arrhenius ionic liquid. Also, the viscosity of the ionic liquid was fitted quite accurately using the relation we developed recently with the characteristic exponent ϕ = 0.166893. This ionic liquid has a rather high surface energy and low surface entropy, which can be attributed to the role of the −OH group involved. The determined surface thermodynamic properties could in part account for the good solvation properties shown by this ionic liquid.

Separation of azeotropic mixtures using protic ionic liquids as extraction solvents

“…The results presented in Table 1 These differences can be related to the different purities (water or unreacted chemicals) of the used ionic liquids. However, the experimental results determined in this work are similar to the reported by Ghatee et al [41]. These studies are important because there is a lack of accuracy of the most common reported methods and a limited range of temperatures are studied which is a barrier for the industrial application of ionic liquids.…”

Mass and charge transport in 1-alkyl-3-methylimidazolium triflate ionic liquids

“…[20][21][22][23] However, these fitting parameters reveal no insight into which molecular-level variables influence transport phenomena. Here we use the CAF to demonstrate that the temperature dependence of mass and charge transport in molten salts can be very accurately described using only system properties instead of empirical equations.…”

On the volumetric properties of 2-hydroxy ethylammonium formate ionic liquid under high-pressures: Measurement and molecular dynamics

“…The aim is to report not only new measurements for density data of 2-HEAF but also molecular dynamic considerations, for which only one effort has been yet reported only under ambient condition [21]. The experimental results for the atmospheric densities (at 0.1 MPa) are going to be compared with the previously reported measurements [16,24]. In addition the mechanical coefficients of 2-HEAF are calculated by the use of a Tait-type equation to derive the internal pressure of IL of interest.…”

“…An extensive literature survey of the previous efforts is available in the recent work of Hosseini et al [21]. The atmospheric densities of 2-HEAF have yet been measured by the use of several apparatuses from non-digital ones like pycnometer [16] to those were based on the digital apparatus like vibrating-tube densimeter [17,[22][23][24].…”

“…2-hydroxy ethylammonium formate (2-HEAF), the IL investigated herein belongs to polar PILs and has been known for ease of synthesis and great solvation properties [16,17] as well. It has also several unique properties; the highest electrical conductivity, lowest shear viscosity, and lowest melting point among the counterpart ILs make it highly useful for various industrial purposes.…”