摘要
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 superhydropholoic alumina coating was obtained by treating the alumina sol, which was prepared by the sol-gel method and dip-coated onto the surface of the microscope slide, with heat and boiling water treatment as well as sur- face modification. Then the preparation process, surface morphology and microstructure, wettability and stability of the alu- mina coating were investigated by contact angle measurement and scanning electron microscope observation. Results showed that the resulting alumina coating had uneven flowerlike structure which was coated with a layer of hydrophobic long alkyl chains. As a result, the alumina coating took on the superhydrophobicity. Moreover, the coating surface still maintains its superhydrophobicity even the alumina coating had been placed in the air for a year, indicating that the superhydrophobicity had long-term stability. Meanwhile, the alumina surface had the strong water-repellent property in a wide range of pH val- ue. For instance, all water contact angles can reach above 146° when the pH value of the water droplets were in the range of 1-11, while the contact angle was decreased markedly when the pH reached 13.8.
出处
《化工新型材料》
CAS
CSCD
北大核心
2012年第9期66-68,共3页
New Chemical Materials
基金
国家自然科学基金(21161012)
甘肃省自然科学基金(1107RJZA184)
关键词
溶胶-凝胶法
氧化铝
超疏水
表面形貌
稳定性
sol-gel method, alumina, superhydrophobicity, surface morphology, stability
