Effects on the fluid interface fluctuations due to the interaction potential form: Exponential interactions

In this work, we investigate nonlocal effects (associated with exponential interactions) on the fluctuation properties of liquid films that completely wet random rough surfaces. It is found that the potential form and effective range could have significant impact on the real space fluctuation properties. The rms interface amplitude shows a complex dependence as a function of the potential effective range b which is characterized by a maximum at length scales smaller than the liquid film thickness. Comparisons with results obtained within the Derjaguin approximation shows that the nonlocal effects are more pronounced for slowly decaying interactions.