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Thermal stability of anatase TiO 2 aerogels
Author(s) -
Zhao Lele,
Wang Shouxin,
Wang Yuanyang,
Li Zhihong
Publication year - 2017
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6103
Subject(s) - anatase , titanium tetrachloride , rutile , calcination , amorphous solid , materials science , chemical engineering , thermal stability , titanium dioxide , aerogel , transmission electron microscopy , titanium , sol gel , ambient pressure , mineralogy , photocatalysis , nanotechnology , crystallography , chemistry , composite material , metallurgy , catalysis , organic chemistry , physics , engineering , thermodynamics
Titanium dioxide (TiO 2 ) aerogels were prepared with sol–gel ambient pressure drying method by using titanium tetrachloride (TiCl 4 ) 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 TiO 2 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 TiO 2 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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