Log-symmetry—a new approach to describing thermochemistry, and other mixing properties, of moderately asymmetric mixtures

Abstract

A new concept is presented for analysing the excess properties of mixing for asymmetric homogeneous mixtures. In its current form the concept is limited to binary mixtures, but applies to numerous classes of materials, and a wide selection of mixing properties. This paper demonstrates that this Log-symmetry concept is general enough to include (as special cases) several existing mixture models; specifically the Regular Solution Theory, van Laar equation, and the Rogalski–Malanowski expression. The above finding suggests log-symmetry is inherently fundamental, in a way that is (yet) not fully explored. In its most basic implementation (the Mirror Data Method) log-symmetric modelling requires merely one independent parameter. This paper employs high-precision experimental data to validate the concept.