Surface thermodynamics of 2-chloroethanol with 2-dimethylaminoethanol and 2-diethylaminoethanol at different temperatures

Abstract

ABSTRACT The surface tension of binary mixtures of 2-chloroethanol with 2-dimethylaminoethanol (DMAE) and 2-diethylaminoethanol (DEAE) was measured over the entire composition range at the temperatures 293.15 K to 313.15 K and atmospheric pressure. The excess values of surface tension were correlated with the Redlich-Kister polynomial equation. The experimental surface tension was correlated with five different theoretical models. The Hilderbrand and Scott theories for ideal solutions (HSIS) and their extensions of Guggenheim’s equation (HSEG), Volume Fraction Statistics, Sudgen method and modified New Parachor method were applied to determine the values of surface tension in the binary solvent systems. The surface tension data were further used to determine the surface thermodynamic properties such as surface entropy (SS) and surface enthalpy (HS) per unit surface area. The results have brought about some useful information on the extent of molecular interactions between the unlike molecules occurring at the surface and bulk.