Anisotropic hysteresis on ratcheted superhydrophobic surfaces

Details Anisotropic hysteresis on ratcheted superhydrophobic surfaces Anisotropic hysteresis on ratcheted superhydrophobic surfaces

2009-04-26

arxiv.org/abs/0904.4066v1

Soft Matter 5, 2704 - 2707 (2009)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures

Scientific paper

10.1039/b904807c

We consider the equilibrium behaviour and dynamics of liquid drops on a superhydrophobic surface patterned with sawtooth ridges or posts. Due to the anisotropic geometry of the surface patterning, the contact line can preferentially depin from one side of the ratchets, leading to a novel, partially suspended, superhydrophobic state. In both this configuration, and the collapsed state, the drops show strong directional contact angle hysteresis as they are pushed across the surface. The easy direction is, however, different for the two states. This observation allows us to interpret recent experiments describing the motion of water drops on butterfly wings.

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