Experimental surface tensions and derived surface properties of binary mixtures of water + alkoxyethanols (C₁E_m, m = 1, 2, 3) and water + ethylene glycol dimethyl ether (C₁E₁C₁) at (298.15, 308.15, and 318.15) K

Abstract

Surface tensions, s, for binary mixtures of water and ethylene glycol monomethyl ether (2-methoxyethanol, C₃H₇O₂; C₁E₁), diethylene glycol monomethyl ether (2-(2-methoxyethoxy)ethanol, C₅H₁₂O₃; C₁E₂), triethylene glycol monomethyl ether [2-{2-(2-methoxyethoxy)ethoxy}ethanol, C₇H₁₆O₄; C₁E₃), and ethylene glycol dimethyl ether (1,2-dimethoxyethane, C₄H₁₀O₂; C₁E₁C₁) are measured over the whole composition range. Measurements were made under atmospheric pressure at (298.15, 308.15, and 318.15) K. The experimental data have been used to calculate the surface tension deviations, Δ_σ, as a function of mole fractions, and values obtained are fitted to the Redlich-Kister polynomial equation to obtain the binary coefficients and the standard errors. The temperature dependence of s at fixed compositions of solution was used to estimate surface enthalpy, H_σ, and surface entropy, S_σ. Also, the molar surface energies, E_σ, have been deduced at 298.15 K using experimental surface tension data.