润湿
接触角
润湿转变
纳米-
材料科学
纳米技术
多孔性
表面能
曲面(拓扑)
热力学
机械
复合材料
几何学
物理
数学
作者
Gyoko Nagayama,Dejian Zhang
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2020-01-01
卷期号:16 (14): 3514-3521
被引量:44
摘要
A general partial wetting model to describe an intermediate wetting state is proposed in this study to explain the deviations between the experimental results and classical theoretical wetting models for hydrophobic surfaces. We derived a theoretical partial wetting model for the static intermediate wetting state based on the thermodynamic energy minimization method. The contact angle based on the partial wetting model is a function of structural parameters and effective wetting ratio f, which agrees with the classical Wenzel and Cassie-Baxter models at f = 1 and 0, respectively. Si samples including porous surfaces, patterned surfaces and hierarchical nano/microstructured surfaces were prepared experimentally, having the same chemical composition but different physical morphology. We found that the experimental water contact angles deviate significantly from the classical Wenzel and Cassie-Baxter models but show good agreement with the proposed partial wetting model.
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