Journal
LANGMUIR
Volume 27, Issue 6, Pages 2595-2600Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la104669k
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Funding
- Australian Research Council
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Water droplets on rough hydrophobic surfaces are known to exist in two states; one in which the droplet is impaled on the Surface asperities (Wenzel state) and the other, a superhydrophobic state in which air remains trapped beneath the droplet (Cassie state). Here, we demonstrate that water droplets can transit from the Wenzel-to-Cassie state even though the former is energetically favored. We find that two distinct superhydrophobic states are produced. One is a true Cassie state; whereas the other exhibits superhydrophobicity in the absence of a vapor phase being trapped in the surface roughness. Furthermore, we can selectively drive the motion of water droplets on tilted structured hydrophobic surfaces by exploiting Wenzel-to-Cassie transitions. This can be achieved by heating the substrate or by directly heating the droplet using a laser.
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