Modification of the Fluctuation Dynamics of Ultrathin Wetting Films

We report on the effect of intermolecular forces on the fluctuations of supported liquid films. Using an optically induced thermal gradient, we form nanometer-thin films of wetting liquids on glass substrates, where van derWaals forces are balanced by thermocapillary forces. We show that the fluctuation dynamics of the film interface is strongly modified by intermolecular forces at lower frequencies. Data spanning three frequency decades are in excellent agreement with theoretical predictions accounting for van der Waals forces. Our results emphasize the relevance of intermolecular forces on thermal fluctuations when fluids are confined at the nanoscale.

Automated summary

This study reports on the impact of intermolecular forces on the fluctuations of supported liquid films, demonstrating that these forces have a strong influence on the dynamics of the film interface at lower frequencies. Experimental data spanning three frequency decades align well with theoretical predictions considering van der Waals forces, highlighting the significance of intermolecular forces on thermal fluctuations in nanoscale confined fluids.