微米/纳米结构对氟硅烷修饰氧化铝表面疏水性能的影响

以多孔氧化铝膜为基板,用NaOH溶液进行化学腐蚀,控制适当的条件,得到氧化铝微米/纳米表面结构.用氟硅烷分别修饰光滑氧化铝膜、多孔氧化铝膜及其微米/纳米结构表面,进行接触角测试、XPS成分分析和SEM结构表征.结果表明,氟硅烷修饰的微米/纳米结构表面对水的接触角(149°±2°)比光滑表面(101°±1°)和纳米孔洞结构表面(141°±2°)都高.

Influence of Micro- and Nano-structures on the Hydrophobicity of the Surface of Alumina Modified with Fluoroalkylsilane

The wettability of solid surfaces, governed by both the chemical composition and the geometrical microstructure of the surface, is a very important property. It is reported that the hydrophobicity of a surface can be enhanced by the nano-structures or micro-structures because air that is trapped between the droplet and the solid surface minimizes the contact area. However, few studies involving the relationship between the hydrophobicity of a surface and the micro- and nano-structures have been reported. Herein, we prepared some micro- and nano-structures with a simple method, the influence of the structures on the hydrophobicity of the surface was given. Some micro- and nano-structures were constructed by etching the porous alumina membrane with NaOH solution. Then, the surfaces of smooth alumina, porous alumina membrane and the micro-and nanostructures were modified with fluoroalkylsilane(FAS-17). The wettability of the modified surfaces were studied by contact angle method and their morphology were characterized by scanning electron microscopy(SEM). The contact angle for water of the micro-and nanostructured surface(149°±2°) was much higher than that of the nano-structured surface (141°±2°) and the smooth surface(101°±1°). It was indicated that the micro-and nano-structure surfaces showed a more excellent property in improving the hydrophobicity than that of the other structured surfaces. The result of XPS analysis was also reported.