Wu Huaping, Jiang Kunpeng, Xu Zhenxiong, Yu Sihang, Peng Xiang, Zhang Zheng, Bai Hao, Liu Aiping, Chai Guozhong
Key Laboratory of E&M , Zhejiang University of Technology, Ministry of Education & Zhejiang Province , Hangzhou 310014 , China.
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering , Zhejiang University , Hangzhou 310027 , China.
Langmuir. 2019 Dec 31;35(52):17000-17008. doi: 10.1021/acs.langmuir.9b03153. Epub 2019 Dec 16.
A droplet that impacts on a superhydrophobic surface will undergo a process of unfolding, contracting, and finally rebounding from the surface. With regards to the pancake bouncing behavior of a droplet, since the retraction process of the droplet is omitted, the contact time is greatly shortened compared to the normal type of bouncing. However, the quantitative prediction to the range of droplet pancake bouncing and the adjustment of pancake bouncing state have yet to be probed into. In this paper, we reported the controllable pancake bouncing of droplets by adjusting the size of the superhydrophobic surface with microstructures. In addition, we also discovered a dimensional effect with regards to pancake bouncing, namely, the pancake bouncing would be more likely to happen on the surfaces with large post spacing for the droplet with the larger radius. The contact time could be reduced to 2 ms by adjusting the size of the microstructures and the radius of the droplets. Based on the relationship between the droplet bouncing state and the surface microstructure size, we are able to propose reasonable dimensions for the surfaces in order to control pancake bouncing.
撞击超疏水表面的液滴会经历展开、收缩，最终从表面反弹的过程。关于液滴的薄饼状弹跳行为，由于省略了液滴的回缩过程，与正常类型的弹跳相比，接触时间大大缩短。然而，对液滴薄饼状弹跳范围的定量预测以及薄饼状弹跳状态的调节尚未得到深入研究。在本文中，我们报道了通过调整具有微结构的超疏水表面的尺寸来实现液滴可控的薄饼状弹跳。此外，我们还发现了关于薄饼状弹跳的尺寸效应，即对于半径较大的液滴，在柱间距较大的表面上更有可能发生薄饼状弹跳。通过调整微结构的尺寸和液滴的半径，接触时间可缩短至2毫秒。基于液滴弹跳状态与表面微结构尺寸之间的关系，我们能够为表面提出合理的尺寸以控制薄饼状弹跳。
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