Kinetic study on photochromism of WO₃ aqueous sol and its enhancement accompanying spectral changes by the addition of TiO₂ aqueous sol

Photochromism of a WO₃ aqueous sol has been investigated in a nitrogen atmosphere under controlled temperature. Effects of ageing of the WO₃ sols, concentrations of WO₃ sols or Cl⁻ ion and temperature on the coloring rate were examined. The coloring rate was the first-order with respect of the WO₃ c...

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Published inColloids and surfaces. A, Physicochemical and engineering aspects Vol. 392; no. 1; pp. 163 - 170
Main Authors Yamazaki, Suzuko, Yamate, Taiki, Adachi, Kenta
Format Journal Article
LanguageEnglish
Published Elsevier B.V 05.12.2011
Subjects
absorption
chlorides
colloids
mixing
nanoparticles
nitrogen
temperature
titanium dioxide
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Summary:Photochromism of a WO₃ aqueous sol has been investigated in a nitrogen atmosphere under controlled temperature. Effects of ageing of the WO₃ sols, concentrations of WO₃ sols or Cl⁻ ion and temperature on the coloring rate were examined. The coloring rate was the first-order with respect of the WO₃ concentration. The coloring process was accelerated by an addition of TiO₂ aqueous sols. Spectral changes were measured using the mixing sol with various molar ratios (γ) of WO₃ and TiO₂. The absorption spectra changed from those having the single peak at 775nm to those with two peaks at 640 and 980nm. Such spectral transformation was ascribed to the structural change of the WO₃ nanoclusters, depending on the γ value and the concentration of Cl⁻ ion.
Bibliography:http://dx.doi.org/10.1016/j.colsurfa.2011.09.050
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2011.09.050