An investigation of angle-dependent optical properties of multi-layer structure pigments formed by metal-oxide-coated mica

The angle-dependent pigments with mica/TiO2/Fe2O3, mica/TiO2/Cr2O3 and mica/TiO2/Co2O3 three-layer structure and with mica/TiO2/Cr2O3/Fe2O3, mica/TiO2/SiO2/Fe2O3 and mica/TiO2/SiO2/Co2O3 four-layer structure were both prepared by the conventional wet chemical method. The obtained pigments were formed by precipitating different ions, such as Cr3+, Fe3+, Co2+ and SiO32− on the pretreated substrates, mica titanium. The comparative optical effects of three-layer and four-layer structure pigments are investigated in detail by using the five angles' spectrophotometer. The results show that the angle-dependent effect and reflection rate of the pigment were improved by the increasing coated layers from three to four-layer structure. The possible mechanism was also discussed in this paper.

The chromaticity coordinates show the color travel effect of mica/TiO2/Cr2O3/Fe2O3, mica/TiO2/SiO2/Fe2O3 and mica/TiO2/SiO2/Co2O3 four-layer structure system and mica/TiO2/Cr2O3, mica/TiO2/Fe2O3 and mica/TiO2/Co2O3 three-layer structure system. The comparative angle-dependent optical effect of three-layer and four-layer system pigments based on different metal-oxide-coatings indicates the enhanced optical properties by the increasing coated layers.Figure optionsDownload as PowerPoint slide