Figure 1 - Behaviour of water drops on different surfaces.


From the following article

Surface chemistry:  Fakir droplets

David Quéré

Nature Materials 1, 14 - 15 (2002)

doi:10.1038/nmat715

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a, Water drop wetting a normal surface forms a low internal contact angle. b, Non-wetting, quasi-spherical drop forms a high internal contact angle on a superhydrophobic surface. c, Drop on a solid surface decorated with pillars. The entire surface is coated with a water-repellent agent, and the space between the pillars is filled with air. Yoshimitsu et al.2 observe that the drop can sit happily on top of these pillars — the so-called 'fakir regime' — corresponding to an apparent contact angle larger than 150° (superhydrophobic behaviour). If the pillar height is shortened, the water contact angle decreases, because air is no longer trapped below the drop.

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