Thermodynamic Interactions Study of Some Ethylene Glycols in Aqueous Aniline Solutions at Different Temperatures: An Acoustical and Volumetric Approach

Abstract

With densities and ultrasonic speeds, interactions of aniline with ethylene glycol, diethylene glycol, and triethylene glycol are measured at T = (293.15−308.15) K. From the densities, the (apparent molar and partial molar) volumes, V ϕ and V ϕ 0 are computed. The apparent specific volume υ ϕ and partial specific volume υ ϕ 0 are also evaluated from density data. The (apparent molar and partial molar) isentropic compressions, K ϕ,s and K ϕ,s o have been evaluated from measured ultrasonic speeds. The transfer properties such as partial molar isentropic compression and partial molar volumes of transfer (ΔK ϕ,s o and ΔV ϕ 0 ) are also determined utilizing density and ultrasonic speed data. The pair and the triplet interaction coefficients are computed from partial molar isentropic compression and partial molar volumes of transfer. The partial molar expansibility (∂V ϕ 0 /∂T) p and second order derivative (∂ 2 V ϕ 0 /∂T 2 ) p are also calculated. The parameters hence obtained are conferred in terms of solute−solute or solute−solvent interactions succeeding in the present ternary system.

Study of Thermodynamic and Acoustic Properties of Niacin in Aqueous Hexylene Glycol and Propylene Glycol at Different Temperatures

“…The S k * values in the table are all negative and refer to the presence of weak solute–solute interaction in the solution. 10 , 15 , 30 …”

Volumetric and Ultrasonic Studies of Molecular Interactions of PEG 400 and PEG 4000 in Aqueous Niacin Solutions at Different Temperatures

“…Moreover, at high concentrations, water molecules around poly­(ethylene glycol)­s are more compressible than at lower concentrations, which results due to dehydration of poly­(ethylene glycol)­s between niacin molecules . The negative values of S K * confirm the existence of solute–solvent interactions at infinite dilution in the liquid mixture …”

“…44 The negative values of S K * confirm the existence of solute−solvent interactions at infinite dilution in the liquid mixture. 45…”

Zn-Based Deep Eutectic Solvent as the Stabilizing Electrolyte for Zn Metal Anode in Rechargeable Aqueous Batteries

“…The DSC measurement results of the ZE DES electrolyte are shown in Figure 3. In the ZE DES electrolyte, there was no discernible peak corresponding to the melting point of EG (−12 °C) (Kaur et al, 2018), indicating that deep eutectics were formed in the absence of unreacted starting components. Therefore, the quantitative generation of deep eutectics through the combination of metal salt and alcohol, for example, EG, could be crucial for lowering the melting temperature.…”