Enhanced water droplet mobility on superhydrophobic rippled nanoshell array

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A 3-dimensional rippled nanoshell structure (a hollow pillar with wriggly sidewall morphology) is demonstrated for superhydrophobicity. As a control group, a straight nanoshell structure without a rippled shape was also prepared. The rippled structure showed improved superhydrophobicity with a large contact angle and a small sliding angle compared to the straight nanoshell structure. These enhancements originate from the minimum of interfacial energy at the triple-phase contact line, which is located at the most protruded circular line along the rippled structure. Using a drop impingement test, the stabilization of a Cassie Baxter state on the rippled structure was also verified. The experimental observation of wetting transition from a Cassie-Baxter to a Wenzel state is well explained by a revamped capillary pressure model, which was customized for the rippled structure. Published by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2016-10
Language
English
Article Type
Article
Keywords

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Citation

APPLIED PHYSICS LETTERS, v.109, no.15

ISSN
0003-6951
DOI
10.1063/1.4964450
URI
http://hdl.handle.net/10203/214456
Appears in Collection
EE-Journal Papers(저널논문)
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