1. Thermochromic Organoaminomodified Silica Composite Films Containing Phosphomolybdic Acid
- Author
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Rui Zhang, Tie, Feng, Wei, Lu, Ran, Yan Bao, Chun, Jin Li, Tie, Ying Zhao, Ying, and Nian Yao, Jian
- Subjects
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COLLOIDS , *CHARGE transfer - Abstract
A novel thermochromic sol–gel film has been prepared for the first time through entrapping phosphomolybdic acid into a kind of inorganic–organic matrix co-hydrolyzed from tetraethylorthosilicate and 3-aminopropyltriethoxysilane. The thus-obtained amorphous nanocomposite film was characterized by IR spectra, UV–vis absorption spectra, XRD, TG–DTA, and ESR. Results show that phosphomolybdate polyanions interact with R–NH+3 cations strongly and disperse homogeneously in the sol-gel matrix. The sol–gel film exhibits thermochromic properties. Annealed from 120 to 180°C, the transparent film changes from pale-yellow to blue. A possible charge-transfer process has been suggested to explain the thermochromism. [Copyright &y& Elsevier]
- Published
- 2002
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