The net effect of the interaction potentials on the wetting behavior by considering a liquid film of thickness on a solid substrate. If, for instance, the adhesive solid-liquid interactions are strong, the system can lower its free energy by increasing the distance between the two surfaces. This leads to a net repulsive force per unit area between the solid-liquid and liquid-vapor interfaces, which is called the disjoining pressure. My question is how to theoretically calculate the adjoining pressure of the absorbed film of polar liquid, such as water, on a solid surface?
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