Spontaneous Breakdown of Superhydrophobicity

Details Spontaneous Breakdown of Superhydrophobicity Spontaneous Breakdown of Superhydrophobicity

2007-05-29

arxiv.org/abs/0705.4210v3

Physical Review Letters 99, 156001 (2007)

Physics

Fluid Dynamics

Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.99.156001

In some cases water droplets can completely wet micro-structured superhydrophobic surfaces. The {\it dynamics} of this rapid process is analyzed by ultra-high-speed imaging. Depending on the scales of the micro-structure, the wetting fronts propagate smoothly and circularly or -- more interestingly -- in a {\it stepwise} manner, leading to a growing {\it square-shaped} wetted area: entering a new row perpendicular to the direction of front propagation takes milliseconds, whereas once this has happened, the row itself fills in microseconds ({\it ``zipping''})

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