Afzali N, Taghvaei E, Moosavi A
Department of Materials Science & Engineering, Sharif University of Technology, Azadi Avenue, Tehran PO Box 11365-9466, Iran.
Nanotechnology. 2020 Nov 13;31(46):465708. doi: 10.1088/1361-6528/abad5c.
A hierarchical superhydrophobic surface is prepared via a two-step boiling water immersion process and anodization of the treated aluminum substrate in a novel hydrophobic electrolyte of aluminum nitrate and stearic acid mixture at room temperature. The immersion time in boiling water had a significant influence on the morphology and durability of the sample. A pseudoboehmite coating is created on the aluminum surface during the boiling process, as revealed by the field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared (FTIR) spectrophotometer results. The energy-dispersive x-ray spectroscopy analysis confirmed the formation of hydrophobic coating surface after anodization. Also, the FE-SEM images and the atomic force microscopy (AFM) investigation proved the hierarchical nano-and microstructure stem from boiling and anodizing procedures, respectively. The successively boiled and anodized surface exhibited contact angle of about 155˚, sliding and hysteresis contact angles of <5˚ and 2˚, respectively. It also demonstrated a self-cleaning property and remarkable durability.
通过两步沸水浸泡工艺以及在室温下于硝酸铝和硬脂酸混合物这种新型疏水电解质中对处理过的铝基板进行阳极氧化，制备出了一种分级超疏水表面。在沸水中的浸泡时间对样品的形态和耐久性有显著影响。场发射扫描电子显微镜（FE-SEM）和傅里叶变换红外（FTIR）光谱仪的结果表明，在沸腾过程中铝表面形成了拟薄水铝石涂层。能量色散X射线光谱分析证实了阳极氧化后疏水涂层表面的形成。此外，FE-SEM图像和原子力显微镜（AFM）研究分别证明了分级纳米结构和微观结构源自沸腾和阳极氧化过程。经过连续煮沸和阳极氧化处理的表面显示出约155˚的接触角、分别小于5˚和2˚的滑动接触角和滞后接触角。它还表现出自清洁性能和显著的耐久性。
