The paper deals with a change in the luminous radiation reflected by surfaces with coats with photocatalytic active particles. In the executed laboratory experiments, we used two commercially available coats with photocatalysts on the basis of TiO2 and one coat without photocatalytic active particles. As the luminous radiation source, we used two different light sources with different spectre. The used light sources provided same radiation intensity at the place of measuring of the reflection from the surface of the sample. In individual phases of the experiments, we repeatedly measured the values of impacting and reflected radiation depending on the type of the coat, its moisture and the used luminous radiation source. The coats were applied to the area of 10x10 cm according to the recommendation of the manufacturer. The weight of the coat on thus prepared samples was ascertained by weighing the sample after it dries out. With regard to the elimination of various inhomogeneities in the coat layer on the sample surface, each sample was repeatedly measured both for impacting and reflected radiation (always after having been turned by 90°). The relation between the moisture of the coat and the reflected light radiation was non-linear and the value of reflected radiation decreased with increasing moisture of the coat layer. With increasing moisture of the coat, we also observed shift in the spectre of reflected radiation towards longer wavelengths.Keywords: TiO2, coating, moisture, radiation reflection
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