Utilisation des cristaux liquides comme phases stationnaires en chromatographie gaz—liquide : V. Étude thermodynamique des solutions dans l'azoxy di(α-méthyl-cinnamate d'undécyle)-4,4′ et le nonanoate de cholestéryle; cinétique des transitions de phase du nonanoate de cholestéryle

Abstract

Liquid crystals as stationary phases in gas—liquid chromatography. V. Thermodynamic study of solutions in azoxy-4,4′-(diundecyl α-methyl cinnamate) and cholesterol nonanoate; Kinetics of phase transitions of cholesteryl nonanoate Infinite dilution and finite concentration gas—liquid chromatography has been used to study the behaviour of three solutes (decane, tetraethylsilane and benzene) in two liquid crystals [azoxy-4,4′-(diundecyl α-methyl cinnamate) and cholesteryl nonanoate] exhibiting quasi-second-order phase transitions between mesophases. The kinetics of the transformations between cholesteric textures and isotropic phase have been studied from the evolution of the peak profiles on stationary phases modified by solute concentration effect.