Work of adhesion is defined as a work required to separate two phases from each other.
Wenzel equation states that adding surface roughness will enhance the wettability caused by the chemistry of the surface.
Interactions at the material surface is influenced by the wettability of the material. Wettability measurements are done to evaluate biocompatibility.
Read about what single-harmonic and multi-harmonic QCM-D means and what the difference is between these instruments.