Influence Of Crystallite Size On Color Properties And Nir Reflectance Of Tio2@Nitio3 Inorganic Pigments

Crystallite size may significantly impact optical properties of inorganic pigments. However, limited studies have so far been reported in this area. In this work, TiO2@NiTiO3 complex pigments were synthesized by precipitation-calcination method. Results showed that the increase in calcination temperature led to the formation of TiO2@NiTiO3 pigments with crystallite sizes from 29 to 82.6 nm but similar morphologies and aggregate particle sizes (around 1 ?m). The yellow component (b*) significantly increased by 7 with crystallite size, but the integrated NIR reflectance decreased slightly (4.02%). Also, the characteristic absorption of NiTiO3 pigments in NIR region declined the integrated NIR reflectance values.