Self-cleaning characteristics on a thin-film surface with nanotube arrays of anodic titanium oxide |
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Authors: | Chien-Chon Chen Jin-Shyong Lin Eric Wei-Guang Diau Tzeng-Feng Liu |
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Affiliation: | (1) Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu, Taiwan, 30010, Taiwan;(2) Department of Material Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan, 30010, Taiwan |
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Abstract: | Self-cleaning of a surface of nanotube arrays of anodic titanium oxide (ATO) is demonstrated. The ATO was prepared in fluoride ion containing sulfate electrolytes with a structure of 0.4 μm length, 100 nm pores diameter, 120 nm interpore distance, 25 nm pore wall thickness, a 8×109 pores cm−2 pore density, and 68.2% porosity. Prepared as thin films either directly from a Ti foil or on a glass substrate, these arrays have the property that water drops spread quickly over the surface of the films without irradiation. In contrast, a flat anatase TiO2 film requires irradiation with UV light for several minutes before the contact angle decreases to zero. The observed self-cleaning behavior of the ATO thin films is due to the capillary effect of the nanochannel structure and the superhydrophilic property of the anatase TiO2 surface inside the tube. |
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Keywords: | KeywordHeading" >PACS 96.15.Lb 61.46.-W 61.46.Fg |
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