Effect of nanobubbles on friction forces between hydrophobic surfaces in water |
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Authors: | Hampton Marc A Donose Bogdan C Taran Elena Nguyen Anh V |
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Affiliation: | aSchool of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-742, South Korea;bInstitute of Advanced Machinery and Design, Seoul National University, Seoul 151-742, South Korea |
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Abstract: | Micro- and nanoscale combined hierarchical polymer structures were fabricated by UV-assisted capillary force lithography. The method is based on the sequential application of engraved polymer molds with a UV-curable resin of polyurethane acrylate (PUA) followed by surface treatment with a trichloro(1H,1H,2H,2H-perfluorooctyl) silane in vapor phase. Two distinct wetting states were observed on these dual-roughness structures. One is “Cassie–Wenzel state” where a water droplet forms heterogeneous contact with microstructures and homogeneous contact with nanostructures. The other is “Cassie–Cassie state” where a droplet makes heterogeneous contact both with micro- and nanostructures. A simple thermodynamic model was developed to explain static contact angle, hysteresis, and wetting transition on dual-roughness structures. |
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Keywords: | Wettability Lithography Dual roughness Hierarchical structure |
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