کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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609988 | 880636 | 2009 | 6 صفحه PDF | دانلود رایگان |

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.
Our experimental and theoretical studies have demonstrated that there can be two distinct wetting states (Cm–Wn and Cm–Cn states) for a hydrophobic dual-roughness surface.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 339, Issue 1, 1 November 2009, Pages 202–207