S Hosseini - Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology-Color and Polymer Research Center (CPRC), Amirkabir University of Technology
S.M Maroofi - Faculty of Polymer Engineering & Color Tech., Amirkabir University of Technology- Color 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

NIR reflective nano-pigments based on CoCr2O4spinel structure have been prepared by the Pechini-type sol-gel method. The effectsof ethylene glycol to citric acid ratiowas 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 shows that the reflectance behaviour enhances with decreasing EG/CA molar ratio. These pigments are considered as new candidates for use in automotive cool coatings

Pechini-type sol-gel, Cool coating, NIR reflective, UV-visible spectrophotometer, XRD