作者：Miao Yu, Sheng Chen, Bo Zhang, Dengli Qiu, Shuxun Cui*
关键字：Superhydrophobic Surface, Lotus effect, force
论文来源：期刊
具体来源：Langmuir, 30, 13615-13621
发表时间：2014年
The unique self-cleaning feature of lotus-like superhydrophobic (SH) surface attracted world-wide interests in recent years. However, the mechanism of the self-cleaning phenomena remains unclear. Here, we attempt to provide a comprehensive understanding of why self-cleaning of the particles with a broad range of size can be realized on the lotus-like SH surfaces. After measurements and analysis of the force involved at the interface, we conclude that there are four main preconditions for self-cleaning: 1) CA > 90°; 2) Low enough sliding angle; 3) Low enough adhesion force; and 4) Proper particle size. However, as far as the lotus-like SH surface and typical dust are concerned, all the preconditions will be satisfied automatically. We also observe that, the particles with a broad range of size (from submicron level to the millimeter level) and density (virtually no limit) can be driven by water droplet on the lotus-like SH surface. This interesting finding may be helpful for the design of novel engineering system at the micron-millimeter scale in the future.