Layering Phase Transition in a Liquid Solution with Cross Hydrogen Bonds: Bond Number Density as the Second Order Parameter

An isobaric equation of state of a binary solution with hydrogen bonds is derived using the thermodynamic grid model. Temperature dependences of the molecular and bond concentrations are calculated. The dependences demonstrate phase transitions, for which both concentrations serve as the order parameters. It is shown that this bicomponent can give rise to new properties of the solution. In particular, there is a threshold hydrogen bond energy over which condensation of hydrogen bonds occurs in a certain range of molecular concentrations.