Thermal stability of anatase TiO2 aerogels |
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| Authors: | Lele Zhao Shouxin Wang Yuanyang Wang Zhihong Li |
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| Affiliation: | 1. School of Environment and Safety, Taiyuan University of Science and Technology, Taiyuan, Shanxi, China;2. School of Chemical and Biological Engineering, Taiyuan University of Science and Technology, Taiyuan, Shanxi, China;3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | Titanium dioxide (TiO2) aerogels were prepared with sol–gel ambient pressure drying method by using titanium tetrachloride (TiCl4) as precursor and tetraethoxysilane as modifier, calcinated at different temperature and characterized by X‐ray diffraction, transmission electron microscopy and small angle X‐ray scattering. The results showed that the TiO2 aerogels remained amorphous under 500 °C, changed to anatase from 600 °C and further changed to rutile from 900 °C. Between 60 °C and 500 °C, the primary particles within the samples concentrated mainly upon small sizes, enlarged and diverged remarkably above 600 °C. The crystalline grains grew and agglomerated with the rise of the calcination temperature. The TiO2 aerogels at a temperature higher than 800 °C have better stability than anatase because of the formation of partial Ti―O―Si bonds. Copyright © 2016 John Wiley & Sons, Ltd. |
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| Keywords: | TiO2 aerogel crystalline phase SAXS |
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