Preparation of a Flexible Superhydrophobic Surface and Its Wetting Mechanism Based on Fractal Theory
Preparation of a Flexible Superhydrophobic Surface and Its Wetting Mechanism Based on Fractal Theory
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基于分形理论的柔性超疏水表面制备及其润湿机理
DOI：
10.1021/acs.langmuir.0c00823
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发表时间：
2020-07-28
期刊：
影响因子：
3.9
通讯作者：
Chen, Liang
中科院分区：
文献类型：
--
作者：
Jiang, Guo;Hu, Jinhuan;Chen, Liang
超疏水表面的衬底对其应用非常重要。柔性超疏水表面的制备越来越受到人们的重视。本工作采用半固化喷涂方法在室温硫化硅橡胶表面制备了柔性基板，获得了具有良好耐磨性的柔性超疏水表面。结果表明，在弯曲条件下，仍保持了良好的超疏水性能。Cassie-Baxter模型和Wenzel模型可用于估算规则粗糙表面的静态水接触角。预测不规则微结构超疏水表面接触角或润湿模式的数值理论模型很少。利用分形理论对Wenzel模型的方程进行变换，得到了适用于不规则粗糙表面上的分形结构的分形润湿理论。然而，这种分形润湿模型不能应用于Cassie-Baxter态，因为它总是适用于超疏水表面。提出了一种计算Cassie-Baxter模型状态下水滴静态水接触角的新方法。利用图像识别和分裂面法，建立了一种新的基于分形理论的模型。碳化硅/碳纳米管微孔结构柔性超疏水表面上的水接触角的实验数据与模拟值相吻合。
Substrates of the superhydrophobic surface are important for their application. Preparation of a flexible superhydrophobic surface has drawn more and more attention. In this work, a flexible substrate was made using a semicuring spray method to obtain a flexible superhydrophobic surface with excellent abrasion resistance on the surface of a room temperature vulcanized silicone rubber. Results show that under a bending condition, excellent superhydrophobic properties are still maintained. The Cassie-Baxter model and Wenzel model can be used to estimate the static water contact angle for regular roughness surfaces. There are few numerical theoretical models to predict contact angle or wetting mode for irregular micronanostructures superhydrophobic surfaces. The fractal theory can be used to transform the equation of the Wenzel model and obtain the fractal wetting theory suitable for fractal structures on irregular rough surfaces. However, this fractal-wetting model cannot be applied to the Cassie-Baxter state, which is always suitable for superhydrophobic surfaces. A new method was developed to calculate the static water contact angle of water droplets in the Cassie-Baxter model state. Using image identification and the splitting surface method, a new model is constructed based on the fractal theory. Experimental data for water contact angles on the flexible superhydrophobic surface with SiC/CNTs micronanostructures is in agreement with the simulated values.