Control of hydrophilic and hydrophobic TiO2 interface

被引：0
|
作者：
Mo L. [1 ]
Yao W. [2 ]
Cao J. [1 ]
Xiang Q. [1 ]
Li Y. [1 ]
机构：
[1] Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing
[2] Department of Chemistry, Tsinghua University, Beijing
来源：
Cao, Jiangli (perov@sina.com) | 2016年 / Editorial Office of Chinese Journal of Rare Metals卷 / 40期
关键词：
Contact angle; Hydrogen; Hydrophilic and hydrophobic; Surface modification; TiO[!sub]2[!/sub;
D O I：
10.13373/j.cnki.cjrm.2016.02.007
中图分类号：
学科分类号：
摘要：
Hydrophobic and hydrophilic properties of TiO2 surface are very important for applications, such as surface catalysis and separation engineering. The influence of annealing in hydrogen atmosphere at 600℃ on the surface hydrophobic and hydrophilic properties of TiO2single crystal was researched. The mechanism beneath the influence of the annealing treatment was also investigated in terms of surface structure and surface energy. It was found in experiment that wetting angle of TiO2 surface increased with the increase in pressure of hydrogen atmosphere. Raman spectra showed that the crystalline structure as well as bonding structure of bulk TiO2 was not affected by the annealing process. However, the roughness of the surface of TiO2 measured by atomic force microscopy (AFM) increased from 0.8 to 2.5 nm after the treatment. Besides, the chemical state of titanium ions on the surface layer was also changed. X-ray photoelectron spectra (XPS) showed the valence of part of titanium ions on the surface of TiO2 was reduced from +4 to +3.The increase in hydrogen pressure led to more reduced titanium ions. Also, the polarity of TiO2 surface was enhanced after the treatment, leading to smaller wetting angle between TiO2 and liquids with higher polarity. The research showed that hydrophobic and hydrophilic properties of TiO2surface by high temperature annealing in hydrogen atmosphere could be applied in catalysis industry, such as selective catalyst. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：137 / 142
页数：5
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