Highly Solar Radiation Reflective Cr2O3–3TiO2 Orange Nanopigment Prepared by a Polymer-Pyrolysis Method
2014
Li, Yuan-Qing | Mei, Shi-Gang | Byon, Young-Ji | Wang, Jian-Lei | Zhang, Guang-Lei
The present study reports the preparation and characterization of an orange nanopigment with high solar radiation reflective properties. Complex Cr₂O₃–3TiO₂ nanoparticles were prepared by the pyrolysis of Cr–Ti precursors at high temperature, and the effects of the calcination temperature on the structure of Cr₂O₃–3TiO₂ nanopigment were investigated by thermal analysis, X-ray diffraction, and transmission electron microscopy. The results reveal that the Cr₂O–-3TiO₂ pigments having rutile structure can be prepared by the calcination of the precursor at above 600 °C. All Cr₂O₃–3TiO₂ pigments are granular in nature and present a homogeneous particle size of around 20 nm. The ultraviolet–visible near infrared (UV–vis-NIR) reflection spectra show that the Cr₂O₃–3TiO₂ nanopigments have a reflection peak at around 600 nm, which reflects the orange color of these pigments. The average reflectance of Cr₂O₃–3TiO₂ in the NIR range is around 53%, respectively, which is much higher than that of the visible light range. The prepared orange Cr₂O₃–3TiO₂ nanopigments have a great potential in applications such as cool materials used for buildings with energy saving performance.
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