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

Abstract

Abstract: 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.

Key words: Micro- and nano-structures, Hydrophobicity, Fluoroalkylsilane, Surface

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CHEN Xin-Hua, MA Yong-Mei, LI Xin-Hong, JIANG Lei, WANG Fo-Song . Influence of Micro-and Nano-structures on the Hydrophobicity of the Surface of Alumina Modified with Fluoroalkylsilane[J]. Chem. J. Chinese Universities, 2004, 25(12): 2304.

References

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