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在肥滴的反弹上
Aditya Jha1, Auriane Huyghues Despointes1, Christophe Clanet2
1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, PSL Research University, ESPCI, 75005, Paris, France.
Soft matter
|November 13, 2023
概括
水滴可以反弹超疏水表面,即使表面张力降低. 降低表面张力会减缓反弹,但动态效应允许一些液体出乎意料地反弹.
科学领域:
- 表面科学是一门学科.
- 流体动力学 流体动力学
- 材料科学 材料科学 材料科学
背景情况:
- 超疏水材料表现出反水性.
- 水的表面张力影响其与表面的相互作用.
研究的目的:
- 研究水滴在降低表面张力的超疏水表面上反弹.
- 确定下降反弹的门表面张力.
- 分析酒精和表面活性剂对水的表面张力和反弹行为的影响.
主要方法:
- 对表面张力值的实验性确定.
- 观察下降冲击和反弹动态.
- 对动态表面张力效应的分析.
主要成果:
- 确定了一个表面张力值,在这个值以下,滴水会附着在基板上.
- 降低表面张力导致由于液体刚度降低而导致反弹速度较慢.
- 含有"缓慢"表面活性剂的液体由于动态表面张力效应,可以反弹到静态值以下.
结论:
- 在超疏水表面上反弹的水滴即使在表面张力降低的情况下也是可能的.
- 动态表面张力在反弹现象中起着至关重要的作用,特别是在表面活性剂中.
- 撞击时的液体变形可以改变表面的特性,使其能够在其他湿液体中排斥.
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