Static and dynamic characterization of droplets on hydrophobic surfaces  

作　　者：YAO ZhaoHui HAO PengFei ZHANG XiWen HE Feng 

机构地区：[1]School of Aerospace, Tsinghua University, Beijing 100084, China

出　　处：《Chinese Science Bulletin》2012年第10期1095-1101,共7页

基　　金：the National Natural Science Foundation of China (10872106 and 11072126)

摘　　要：We report on our study of the static and dynamic wetting property of hydrophobic surfaces with micro-and dual micro/nano-scale structures.Simulations based on the lattice Boltzmann method showed that the apparent contact angle of water droplets on hy-drophobic surfaces with micro-scale structures increases as solid area decreases,whereas dual micro/nano-scale structures not only increase surface hydrophobicity but also greatly stabilize the Cassie state of droplets.Droplets falling on a superhydrophobic surface distort and,depending of free energy,sometimes bounced on the surface before finally adhering to the surface.These phenomena are in agreement with experimental observations.Simulated results also show that micro/nano-scale surface structures can increase droplet rebound height,which depends on static apparent contact angle.We report on our study of the static and dynamic wetting property of hydrophobic surfaces with micro- and dual micro/nano-scale structures. Simulations based on the lattice Boltzmann method showed that the apparent contact angle of water droplets on hydrophobic surfaces with micro-scale structures increases as solid area decreases, whereas dual micro/nano-scale structures not only increase surface hydrophobicity but also greatly stabilize the Cassie state of droplets. Droplets falling on a superhydrophobic surface distort and, depending of free energy, sometimes bounced on the surface before finally adhering to the surface. These phenomena are in agreement with experimental observations. Simulated results also show that micro/nano-scale surface structures can increase droplet rebound height, which depends on static apparent contact angle.

关 键 词：疏水表面 格子BOLTZMANN方法 动态特性 静态 液滴 纳米尺度 表面结构 表面润湿性 

分 类 号：O351[理学—流体力学]