Cassie-state wetting investigated by means of a hole-to-pillar density gradient.


The superhydrophobicity of rough surfaces owes its existence to heterogeneous wetting. To investigate this phenomenon, density gradients of randomly placed holes and pillars have been fabricated by means of photolithography. On such surfaces, drops can be observed in the Cassie state over the full range of f(1) (fraction of the drop's footprint area in… (More)
DOI: 10.1021/la904714c


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