The aim of our research has been to determine the surface energy and pressure of a liquid in porous materials. On the basis of a purely thermodynamic analysis, and without recourse to any geometrical model for the porous material, we have derived new equations for the liquid pressure and for the surface energy. The empirical thermodynamic information required comprises vapor pressure and sorption heat measurements and the critical temperature. As an example illustrating the application of these equations we have determined the surface energies and pressure of water in a hygroscopic material. Representative numerical examples are presented and they are compared to the results of Kelvin's equation.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering