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Photo-reactions in the solid state : titanium dioxide and related systems

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MacKenzieJ_1952redux.pdf (14.96Mb)
Date
1952
Author
Mackenzie, John
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Abstract
 
 
1. The photo -sensitising oxides have been shown to exhibit a 'fixation' of gaseous oxygen on illumination with near U -V light. This reaction was found to be specific for oxygen among the gases investigated.
 
2. The method developed for the study of the photo - oxidation of plant pigments on thallous bromide has been found to be unsuitable to the study of the photo- oxidation of Chlorazol Sky Blue and Malachite Green adsorbed on various sensitising oxides.
 
3. The correlation between the sensitising activity of the various oxides and the various samples of TiO2 and their power of oxygen 'fixation' has been demonstrated over a wide range.
 
4.The reaction with TiO₂ has been shown independent of the presence of various impurities. No bulk stoichiometric oxide was formed as a final product.
 
5. The production of a short-life highly-active oxidising agent has been demonstrated but no evidence of hydrogen peroxide was found when considering Ti0₂.
 
6. Various physical parameters of the reaction between oxygen and titanium dioxide were investigated. They indicated that it was not a pure photo -chemical reaction.
 
7. Zinc oxide was shown to behave in a manner similar to that exhibited by TiO₂ with the exception of the production of H₂0₂ in the presence of water.
 
8. The fading of Chlorazol Sky Blue, adsorbed on the oxides, was demonstrated to be an oxidation reaction occurring in vacuo and in oxygen. In the former case, however, the reaction ceased long before complet ion of total fading. The type of reaction exhibited by Lialachite Green oxalate, adsorbed on Ti0₂, appeared to differ from that reported for the same dye sensitised by TlBr.
 
9. General reaction schemes have been proposed to account for the main features of the photo- fixation of the gaseous oxygen and subsequently the photosensitising effects of the various oxides.
 
10. The rapid oxygen uptake by various samples of as Ti0₂ on illumination is proposed an analytical method of determining small quantities of that gas contained in inert atmospheres.
 
URI
http://hdl.handle.net/1842/28495
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