Abstract
Novel orange thermal insulation coated fabrics were prepared by applying La2Zr2-xFexO7-δ (0.00 ≤ x ≤ 0.25) pigments. The formation of Fe3+-doped La2Zr2O7 pigment was ensured by analyzing XRD and XPS patterns. The pigment samples have near-spherical particles with particle sizes between 30 and 70 nm. The NIR solar reflectance of the pigments is very high, ranging from 75.97 % to 96.18 %, and its change is caused by the variation in free charge carrier concentration. Doping with Fe3+ ions makes the color of the pigment appear orange and reduces the band gap vaule from 5.17 eV to 2.32 eV, mainly attributed to the charge transfer transition of La 5d ↔ Fe 3d. The La2Zr2-xFexO7-δ-coated fabrics exhibit excellent orange color and outstanding NIR solar reflectance (R* = 51.08 % − 64.47 %). Experimental simulations revealed that the designed coated fabrics have lower internal surface temperatures, with a temperature difference of 7.9–14.7 ℃ compared to conventional orange coated fabric, which shows superb thermal insulation performance. The fastness of washing, acids, and alkalis was excellent for fabric. In conclusion, the La2Zr2-xFexO7-δ-coated fabrics can achieve thermal insulation and energy savings by means of NIR solar reflectivity pigments.
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