title: Phase behavior of liquid-crystalline emulsion systems.
abstract: The phase behavior of a mixture containing a surfactant, fatty alcohols and water has been analyzed. Depending on the amount of surfactant, i.e. N-(3-dimethylaminopropyl) octadecanamide, the emulsion-like system forms different microstructures. With increasing surfactant content the formulation evolves from a system with lyotropic lamellar phases to a system with crystal layer phases. (13)C-CPMAS NMR studies carried out at varying surfactant levels showed significant differences in the behavior of the system. Using (2)H and (13)C-CPMAS NMR, X-ray scattering, DSC and polarization microscopy a phase diagram of this system could be derived. Additionally, ultrasonic velocity measurements showed that the ripening process of the emulsions can take up to 2 weeks and longer.
authors.affiliation: Beiersdorf AG, 20245 Hamburg, Germany.
authors.forename: Petra
authors.initials: P
authors.lastname: Kudla
authors.forename: Tobias
authors.initials: T
authors.lastname: Sokolowski
authors.forename: Bernhard
authors.initials: B
authors.lastname: Blümich
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Wittern