Stability of thin polar films on non-wettable substrates

The linear and non-linear stabilities of thin ( 12 nm) completely polar films (e.g. water films bounded by octane) evolves very slowly, and the substrate may appear to be wettable, notwithstanding a large equilibrium contact angle. In contrast to the apolar films, the non-linear interactions in polar films may remain significant even for the small-amplitude thermal perturbations.