Which interface are you interested in?
The behaviour of interfacial systems depends on a range of properties, e.g. chemical composition, orientation, charge, hydrophobicity, porosity, density, “contact area” etc. How these properties change with time, temperature and composition of the bulk phases controls their stability and ultimately their usability in both industrial and academic applications.
Different properties can be accessed with different experimental, theoretical and model-based techniques. A sufficient understanding often requires the use of multiple techniques. The nature and form (e.g. “macroscopic” / dispersed) of the bulk phases and the mixture, dictate which techniques are relevant.
Interfaces, particularly in dispersed systems are also strongly affected by dynamic properties such as flow behaviour. Viscosity and rheology of liquid containing systems can therefore be of importance.