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通过在载玻片表面涂覆一层由溶胶-凝胶法制备的氧化铝溶胶,再经过一定的热处理、沸水处理和表面修饰等工艺,得到了一种超疏水性氧化铝表面。利用接触角测试和扫描电子显微镜观测等技术对薄膜的制备过程、表面形貌和微观结构、润湿性能及其稳定性等进行了考察。结果表明:所制得的氧化铝薄膜由多孔的花瓣状粗糙结构和疏水长链单分子层构成,从而赋予该薄膜具有超疏水特性。而且,所制备的薄膜在空气中放置一年后,其表面仍然保持超疏水特性,表明该薄膜的超疏水特性十分稳定。同时,该薄膜在较宽的pH值范围内,其表面都呈现出十分强的疏水特性,如当水滴的pH值在1-11范围内时,薄膜表面接触角均在146°以上;而当水滴的pH值达到13.8时,其接触角显著降低。
A superhydrophobic alumina surface was obtained by coating a glass slide with an alumina sol prepared by a sol-gel process, followed by a certain amount of heat treatment, boiling water treatment and surface modification. The preparation process, surface morphology and microstructure, wettability and stability of the films were investigated by using contact angle measurement and scanning electron microscopy. The results show that the prepared alumina film is composed of porous petal-like rough structure and hydrophobic long chain monolayer, which gives the film superhydrophobic properties. Moreover, the surface of the prepared film remained superhydrophobic for one year after it was left in air, indicating that the superhydrophobic property of the film is very stable. At the same time, the surface of the film exhibits very strong hydrophobic properties over a wide range of pH values. For example, when the droplet’s pH value is in the range of 1-11, the contact angle of the film surface is more than 146 °. When When the pH value of water droplets reaches 13.8, the contact angle is significantly reduced.