超亲水-超疏水组合壁面冷凝性能研究

本文通过水热法,结合气相沉积法和掩膜紫外光刻法,在玻璃基底上成功地制备了一种具有多尺度结构的超亲水-超疏水组合壁面,并对制备的具有不同润湿差异的组合壁面的冷凝效率进行了测试。结果表明壁面的冷凝效率取决于亲疏水区域的宽度和润湿性差异,其中当亲水区域宽度为0.80 mm,接触角约为0°,疏水区域宽度为0.95 mm,接触角为158°时,其冷凝效率相比光滑铜片的冷凝效率可以提高39%。进一步分析表明,液滴在极端润湿模式的组合表面的润湿分界线处具有较高的体积传输速率,且在超亲水区形成的连续微流通道加快了冷凝液滴快速排放,提高了整体表面的自更新能力。本文的研究,将为复杂润湿界面滴状冷凝的优化提供方向。

Vapor Condensation on Hybrid Superhydrophilic/Superhydrophobic Surfaces

In this paper,hybrid superhydrophobic/superhydrophilic surfaces were synthesized using hydrothermal treatments combining with vapor deposition and UV-irradiation,on which the condensation efficiencies were studied.Results show that the condensation efficiency depends on the width and the wettability difference of the hydrophilic and hydrophobic region.The condensation efficiency has a maximum value when the widths of the hydrophilic and hydrophobic region are 0.80 mm and 0.95 mm,respectively and can be 0.39 times larger than that of the copper surface.Further analysis demonstrates that the continuous micro-channels formed in the superhydrophilic region accelerates the drainage of condensate droplets and improves the self-renewal ability of the surface during the condensation process.The study provides a direction for the optimization of droplet condensation at complex wetting interfaces.