莲花效应
冷凝
接触角
下降(电信)
材料科学
蒸发
水分
化学工程
微观结构
润湿
纳米技术
复合材料
化学
气象学
有机化学
工程类
物理
电信
原材料
计算机科学
作者
Bernd Mockenhaupt,Hans-Jürgen Ensikat,Manuel Spaeth,Wilhelm Barthlott
出处
期刊:Langmuir
[American Chemical Society]
日期:2008-10-30
卷期号:24 (23): 13591-13597
被引量:88
摘要
The stability of superhydrophobic properties of eight plants and four technical surfaces in respect to water condensation has been compared. Contact and sliding angles were measured after application of water drops of ambient temperature (20 °C) onto cooled surfaces. Water evaporating from the drops condensed, due to the temperature difference between the drops and the surface, on the cooled samples, forming “satellite droplets” in the vicinity of the drops. Surface cooling to 15, 10, and 5 °C showed a gradual decrease of superhydrophobicity. The decrease was dependent on the specific surface architecture of the sample. The least decrease was found on hierarchically structured surfaces with a combination of a coarse microstructure and submicrometer-sized structures, similar to that of the Lotus leaf. Control experiments with glycerol droplets, which show no evaporation, and thus no condensation, were carried out to verify that the effects with water were caused by condensation from the drop (secondary condensation). Furthermore, the superhydrophobic properties after condensation on cooled surfaces from a humid environment for 10 min were examined. After this period, the surfaces were covered with spherical water droplets, but most samples retained their superhydrophobicity. Again, the best stability of the water-repellent properties was found on hierarchically structured surfaces similar to that of the Lotus leaf.
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