阳极氧化
接触角
材料科学
硫酸
电解质
化学工程
草酸
扫描电子显微镜
铝
电化学
图层(电子)
无定形固体
冶金
复合材料
无机化学
化学
电极
结晶学
物理化学
工程类
作者
Hamid Saffari,Beheshteh Sohrabi,Mohammad Reza Noori,Hamid Reza Talesh Bahrami
标识
DOI:10.1016/j.apsusc.2017.11.188
摘要
A single step anodizing process is used to produce micro-nano structures on Aluminum (1050) substrates with sulfuric acid as electrolyte. Therefore, surface energy of the anodized layer is reduced using stearic acid modification. Undoubtedly, effects of different parameters including anodizing time, electrical current, and type and concentration of electrolyte on the final contact angle are systemically studied and optimized. Results show that anodizing current of 0.41 A, electrolyte (sulfuric acid) concentration of 15 wt.% and anodizing time of 90 min are optimal conditions which give contact angle as high as 159.2° and sliding angle lower than 5°. Moreover, the study reveals that adding oxalic acid to the sulfuric acid cannot enhance superhydrophobicity of the samples. Also, scanning electron microscopy images of samples show that irregular (bird's nest) structures present on the surface instead of high-ordered honeycomb structures expecting from normal anodizing process. Additionally, X-ray diffraction analysis of the samples shows that only amorphous structures present on the surface. The Brunauer–Emmett–Teller (BET) specific surface area of the anodized layer is 2.55 m2 g−1 in optimal condition. Ultimately, the surface keeps its hydrophobicity in air and deionized water (DIW) after one week and 12 weeks, respectively.
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