Water Droplet Bouncing and Superhydrophobicity Induced by Multiscale Hierarchical Nanostructures
Water Droplet Bouncing and Superhydrophobicity Induced by Multiscale Hierarchical Nanostructures
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DOI：
10.1021/nn3032547
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发表时间：
2012-09-01
期刊：
影响因子：
17.1
通讯作者：
Youn, Jae Ryoun
中科院分区：
文献类型：
--
作者：
Lee, Doo Jin;Kim, Hyung Min;Youn, Jae Ryoun
研究了多尺度层次结构的超疏水性和水滴在超疏水表面的反弹现象。采用水热法制备了碳纳米管/氧化锌和氧化锌/碳纳米纤维的多尺度层次化结构。由于Cassie-Baxter态中气囊的增加，多尺度层次结构表现出超疏水性，静态接触角(CA)大于160度。通过自由能垒(FEB)分析和有限元模拟，解释了水在多尺度层次化纳米结构上的弹跳效应。多尺度层次化纳米结构显示出较低的FeBS，由于向后退和前进方向的能量耗散较小，从而引起较高的CA和反弹现象。
Superhydrophobicity of multiscale hierarchical structures and bouncing phenomenon of a water droplet on the superhydrophobic surface were studied. The multiscale hierarchical structures of carbon nanotube/ZnO and ZnO/carbon nanofiber were produced by the hydrothermal method. The multiscale hierarchical structure showed superhydrophobicity with a static contact angle (CA) larger than 160 degrees due to increased air pockets in the Cassie-Baxter state. The water bouncing effect observed on the multiscale hierarchical nanostructure was explained by the free energy barrier (FEB) analysis and finite element simulation. The multiscale hierarchical nanostructure showed low FEBs which provoke high CA and bouncing phenomenon due to small energy dissipation toward receding and advancing directions.