Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Daehak-Dong, Gwanak-Gu, Seoul 151-744, Korea.
ACS Nano. 2012 Sep 25;6(9):7656-64. doi: 10.1021/nn3032547. Epub 2012 Sep 4.
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° 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.
研究了具有多尺度分层结构的超疏水表面和液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/碳纤维纳米纤维的多尺度分层结构。由于Cassie-Baxter 状态下空气口袋的增加，多尺度分层结构表现出超疏水性，静态接触角（CA）大于 160°。通过自由能势垒（FEB）分析和有限元模拟解释了在多尺度分层纳米结构上观察到的水反弹效应。多尺度分层纳米结构的 FEB 较低，这导致高 CA 和反弹现象，因为在后退和前进方向上的能量耗散较小。
