Prevention of the Chalking Effect in Photocatalytic Polymer Sheets Using Apatite-Coated TiO2 Particles

When TiO2 particle doped PVDF sheets are irradiated by UV-light, the sheets become cloudy, because local photocatalytic decomposition of PVDF leads to an increase in the surface roughness on a sub-micrometer scale. This is called “the chalking effect”. The photocatalytic decomposition results in low...

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Bibliographic Details
Published in:KOBUNSHI RONBUNSHU 2015/04/25, Vol.72(4), pp.178-183
Main Authors: HONDA, Hayato, MAEDA, Masahiko
Format: Article
Language:Japanese
Subjects:
Apatite
Chalking Effect
Photocatalysis
Polymer Sheet
Solvent Casting Process
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Summary:When TiO2 particle doped PVDF sheets are irradiated by UV-light, the sheets become cloudy, because local photocatalytic decomposition of PVDF leads to an increase in the surface roughness on a sub-micrometer scale. This is called “the chalking effect”. The photocatalytic decomposition results in lower transmittance because of UV-light scattering. In this study, we investigated TiO2 particles that were coated with photocatalytically inactive apatite. TiO2 particle surface coating with apatite was controlled by the drying conditions of the final stage of particle preparation. By using those particles, the contact area between PVDF and TiO2 is reduced, and as a result, we found that the chalking effect of PVDF sheets is clearly suppressed.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.2014-0085