S.M Maroofi - Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology-Color and Polymer Research Center (CPRC), Amirkabir University of Technology
S Hosseini - Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology- ۲Color and Polymer Research Center (CPRC), Amirkabir University of Technology
A.A Sabbagh Alvani - Color and Polymer Research Center (CPRC), Amirkabir University of Technology
H.R Hedayati - Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology- Color and Polymer Research Center (CPRC), Amirkabir University of Technology

Pigments based on CoCr2O4spinel structure have been prepared viaPechini-type sol-gel method. The molar ratio of citric acid to cations and pH valuehave been evaluated.The developed nano-crystalline powders were characterized by X-ray diffraction (XRD), UV-Vis-NIR diffuse reflectance spectroscopy and CIE-L*a*b* 1976 color scales. The results show that the reflectance behaviour enhances with increasing CA/M molar ratio and decreasing pH value. These facts express potential of the pigments to be employed in automotive cool coatings.

NIR reflective pigment,Pechini-type sol-gel, Cool coating, UV-vis-NIR spectrophotometry