Interfacial properties determine the stability of dispersed systems and a wide range of functional properties, such as those of powdered materials.
Interfacial tensions and wetting properties can be investigated using tensiometry (Wilhelmy plate, Du Nouy ring, and Washburn methods).
Interactions between product components and water are relevant in many processing operations. Free and bound water content can be analyzed using various methods. The oven-drying method and Karl Fischer titration are used as standard methods for moisture determination. The water activity of a material system is analyzed using a thermoconstant. Sorption behavior across a wide moisture range can be investigated using dynamic water vapor sorption. In this process, sorption isotherms and, where applicable, suitable sorption models are determined.