Hydrophobic forces in thin liquid films: Adsorption contribution

The contribution of adsorption to the hydrophobic forces in a thin liquid film is considered. It is shown that the corresponding disjoining pressure component depends exponentially on the film thickness. Expressions for both the magnitude and decay length of this force are proposed in terms of well-known thermodynamic characteristics. Comparison of the theory to existing experimental results confirms the importance of the adsorption component to the hydrophobic interaction.