Partially Wetting Thin Films show no capillary dynamics

partialwetting_0001.jpg

This week’s very short item is featuring recently published work by Christian Gutt et al. on XPCS studies of thin partially wetting liquid films: Phys. Rev. Lett. 99, 096104 (2007).

The basic summary of the result is that thin (unlike the partially wetting macroscopic droplet shown on the left) liquid films apeear to be heavily pinned (at least at longer wavelengths) – and as a result do not show the capillary fluctuations that exist at free surfaces of liquids. Dynamically these liquid films appear very similar to solids.

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