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권태우(Tae Woo Kwon),장준경(Joonkyung Jang),Matthew Stanley Ambrosia,하만영(Man Young Ha) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Using all-atom molecular dynamics simulation, we investigated the wetting behavior of a water droplet on a surface texturized with nanoscale pillars. We studied the surfaces with nonhierarchical and hierarchical roughnesses by systematically varying the pillar height. A surface decorated with a hierarchical roughness showed an enhanced hydrophobicity in that the droplet on such a surface prefers the Cassie-Baxter state over the Wenzel state. A hierarchical roughness also gave an enhanced contact angle of a droplet. Even a hydrophilic surface (contact angle is < 90°) turned hydrophobic (contact angle > 90°) with a hierarchical roughness on it. We show the adhesion energy of a droplet to its underlying surface is correlated with the contact angle and therefore is a fundamental measure of the wettability of the