Abstract
The use of cool pigments is considered to be a proper strategy to reduce energy consumption in buildings. In the present research, cool pigment nanocomposites based on Fe, Cr and Ti oxides were synthesized as two different composites namely (Fe,Cr)2O3@TiO2 core-shell and physically mixed oxides ones. The NIR reflectance behavior of pigments was examined. The effect of thermal treatment and preparation method on the composition, structure and NIR reflection properties were investigated at two temperatures of 500 and 1000 °C. It was seen that by increasing the treatment temperature to 1000 °C, the NIR reflectance value enhances for both synthesis method moreover for Fe-Cr composition the physically mixing method is more effective on NIR-reflection than that for the in-situ method. For Fe-Cr-Ti compositions, it was found that (Fe,Cr)2O3@TiO2 core-shell reveals NIR reflectance of 57.8% which is higher than that obtained from the physically mixed method (47.8%). The (Fe,Cr)2O3@TiO2 core-shell structures can be introduced as new generated cool pigments for energy-saving applications due to their facile synthesis, color multiplicity, and relatively high NIR properties.
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