Synthesis optimization and characterization of CoAl2O4 nanoparticles as blue pigment
Abstract
Blue ceramic pigment was prepared as CoAl2O4 nanoparticles. Alumina and Co2O3 was used for the synthesis of pigment by sol-gel method where heating and dissolution was conducted in a soundwave bath, followed by calcination at 400 – 800 oC and cooling in a hydrothermal autoclave at 200 ºC. The process of supersaturation and deposition upon cooling facilitated the growth of nanoparticle. Response surface methodology (RSM) were utilized to reveal the optimum values of pH, calcination time and calcination temperature. The maximum absorbance by CoAl2O4 occurred at pH of 10, calcination temperature at 800 oC, and calcination time of 2 hours. Morphological and thermal characterization employing XRD, TEM, TGA and DSC confirmed the optimum calcination temperature as the Cobalt pigment stabilize its crystal structure.
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