Fraunhofer Institute for Interfacial Engineering and Biotechnology IGBFurther physical and chemical characterizations can be determined by subsequent analytical methods. These include the analysis of surface tensions (tensiometry), of absorption behavior of UV and visible light (UV/VIS spectroscopy) and viscosity (rheology) of liquids, as well as detection of radicals (electron spin resonance), the investigation of thin films (ellipsometry) and others.