Excess thermodynamic functions of mixtures of fluorocarbons with fluorocarbon-hydrocarbon compounds

A study of excess thermodynamic functions is undertaken with mixtures of perfluoro(octyl) bromide (PFOB) and CnF2n + 1CmH2m + 1 (FnHm) diblock molecules and of bis-1,2-(F-butyl)ethene (F-44E) with FnHm at 25 °C in order to better understand the dramatic stabilization of fluorocarbon–egg yolk phospholipid (EYP) emulsions achieved by adding mixed fluorocarbon/hydrocarbon diblock compounds. We establish here that such mixtures behave differently from fluorocarbon/fluorocarbon and hydrocarbon/hydrocarbon mixtures. The fluorine/hydrogen ratio in mixed FnHm compounds and the length of their fluorocarbon chain have a large impact on the excess thermodynamic functions.