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首先,采用光刻工艺制备微结构基底,并利用低表面能的纳米颗粒对其修饰,制备出了四种具有不同微结构参数的超疏水表面。然后,利用金相显微镜和场发射扫描电子显微镜对所制备表面进行形貌表征,计算了表面的粗糙因子,并进一步测量所制备表面的平衡接触角和滚动角,分析了不同参数微结构对表面疏水性的影响。最后,利用高速摄像机以40 000 f/s的拍摄速度记录了液滴在超疏水表面上的撞击动力学过程。通过对比液滴在不同表面上的碰撞现象、最大铺展系数、接触时间、铺展时间和回缩时间等,揭示了超疏水表面微结构对液滴撞击动力学的影响。结果表明:四种表面的粗糙因子分别为1、2.25、1.8和1.41;同时,表面的平衡接触角均大于150°,滚动角均小于20°,疏水性能良好。对于发生完全反弹的液滴而言,其最大铺展系数受表面微结构的影响较小;表面的微结构对液滴回缩时间和接触时间有影响,但是对铺展时间的影响不大。
Abstract：Firstly,micro-structured substrates were prepared by photolithography and further modified with nanoparticles of low surface energy,and four kinds of superhydrophobic surfaces with different microstructure parameters were obtained.Then,the morphology of the prepared surfaces was characterized by the metallographic microscope and field emission scanning electron microscope,and the surface roughness factor was calculated.By further measuring the equilibrium contact angle and the sliding angle of the prepared surfaces,the effect of microstructures with different parameters on the surface hydrophobicity was analyzed.Finally,the impact dynamic process of droplets on the superhydrophobic surfaces was recorded by high-speed camera at 40 000 f/s.The effect of microstructures of superhydrophobic surfaces on droplet impact dynamics was revealed by comparing the impact phenomenon,maximum spreading coefficient,contact time,spreading time and recoiling time of droplets on different surfaces.The results indicate that the roughness factors of the four surfaces are 1,2.25,1.8 and 1.41,respectively.In addition,the equilibrium contact angles of the surfaces are greater than 150°,the sliding angles are less than 20°,and the hydrophobic property is good.For the droplets with complete rebound,the maximum spreading coefficient is less affected by the surface microstructure.The surface microstructure has an influence on the recoiling time and contact time,but slightly on the spreading time.
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基本信息:
DOI：10.13250/j.cnki.wndz.2020.08.008
中图分类号:O35
引用信息:
[1]赵亚鸽,林世玑,赵彬钰,等.微结构超疏水表面的制备及其对液滴撞击动力学的影响[J].微纳电子技术,2020,57(08):643-649.DOI:10.13250/j.cnki.wndz.2020.08.008.
基金信息:
四川省青年科技基金资助项目（2016JQ0050)
2020-07-24
2020-07-24