Analysis of Surface Thermodynamics for Amino Acid Ionic Liquid–1-Dimethylamino-2-propanol Aqueous Blends

Abstract

In this work, the surface tensions (γ) of the aqueous blends of 1-dimethylamino-2-propanol (DMA2P) + amino acid ionic liquids (AAILs) were studied using the Wilhelmy plate method at temperatures from 303.2 to 323.2 K and atmospheric pressure. The AAILs include tetramethylammoniumglycinate ([N1111]­[Gly]), 1-butyl-3-methylimidazolium glycinate ([Bmim]­[Gly]), and 1-butyl-3-methylimidazolium-l-lysinate ([Bmim]­[Lys]). The concentrations of DMA2P and AAILs were varied between 0.300 and 0.500 wt % and 0.025 and 0.075 wt %, respectively. A thermodynamic correlation approach with respect to the mass fraction and temperature was employed to correlate the surface tension of DMA2P–AAILs aqueous solutions. The surface entropy (S S) and surface enthalpy (H S) were calculated from the analytical formulation, and their variation with mass fraction and temperature was demonstrated. The effects of the types of AAILs on the surface properties were also analyzed and compared.

Surface Thermodynamics, Viscosity, Activation Energy of N-Methyldiethanolamine Aqueous Solutions Promoted by Tetramethylammonium Arginate

“…The surface tension of a mixed solution depends on the composition and temperature of the solution. The model used in a previous study was adopted here because of its simplicity and prediction accuracy [ 36 ]: where γ 0 and γ ′ can be expressed as follows: where the subscripts 1, 2, and 3 in the formulas represent MDEA, [N 1111 ][Arg], and water, respectively; x i represents the mole fraction of component i ; and γ i represents the surface tension of pure component i , which is linear with temperature. G ij represents the mutual influence between components i and j .…”

“…G ij represents the mutual influence between components i and j . To adapt to the new solution system in this study, the calculation equation is obtained by modifying the equation used in the previous research [ 36 ]: …”

“…The surface tension of a mixed solution depends on the composition and temperature of the solution. The model used in a previous study was adopted here because of its simplicity and prediction accuracy [36]:…”

“…To adapt to the new solution system in this study, the calculation equation is obtained by modifying the equation used in the previous research [36]: By combining Equations (1)-(6), the surface tension can be formulated as:…”

Amino Acids Ionic Liquids

“…The results showed that the hydrogen bond and electrostatic interaction between molecules played an important role in stabilizing the cation-anion system. Wang et al [4] At present, the most widely used simulation method is molecular dynamics simulation, which is based on classical mechanics. By calculating the equation of motion, the movement of a single molecule with time is obtained to simulate the actual system.…”