Abstract
In the present research, CoAl2O4 nano-pigment powder was synthesized by a combination of citrate–gel processing and microwave-assisted heating route. Blue CoAl2O4 ceramic nano-pigment was rapidly obtained after calcination in microwave oven. Thermal decomposition behavior of the as-synthesized precursor was monitored by DTA/TGA (differential thermal analysis/thermo-gravimetric analysis). The effects of various microwave exposure times (8–15 min) on the phase composition and difference in color were evaluated through X-ray diffraction (XRD) and CIE Lab color space system, respectively. The mean crystallite size of blue nano-pigment powders was determined by the X-ray line broadening technique. The optimum time of pigment processing by utilizing microwave oven was obtained at 15 min to get a sufficiently intense blue color. Scanning electron microscopy (SEM) and field emission SEM (FE-SEM) characterizations were employed to observe the size and morphology of optimum powder particles. Particles size analysis by SEM indicated that the majority of quasi-spherical particles have a small size in the range of nano which was in agreement with XRD results, while FE-SEM studies confirmed flower-like morphology of as-prepared powder.
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