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Detailed Program
Paper Number : SY-O03
Time Frame : 16:20~16:35
Presentation Date : Thurse day, 27, November
Session Name : Synthesis, Raw Materials & Advanced powder processing
Session Chair 1# : Dong Sik Bae
Session Chair 2# : Koichiro Tsuzuku
Synthesis and Characterization of the Spinel System Inorganic-Pigment by a Reverse Micelle Processing
JEONG HUN SON
Changwon National Univ
The spinel system inorganic pigments have high thermal stability and chemical resistance at high temperature. So Inorganic pigments used in clay, paints, plastic, polymer, color glass and ceramics. Spinel structures have general formula AB2O4. In this structure there are four octahedral holes and eight tetrahedral holes per molecule. In normal spinels, A2+ ions occupy tetrahedral holes and B3+ ions are present in the octahedral holes and the anions are arranged in a cubic close packed array. CoAl2O4 nanopowders was synthesized by reverse micelle processing the mixed precursor (consisting of A2+ ions Cobalt(¥±) nitrate hexahydrate and B3+ ions Aluminum nitrate nonhydrate). The CoAl2O4 was prepared by mixing the aqueous solution at a molar ratio of Co : Al = 1 : 2. The average size and distribution of synthesized powders with heat treat at 900, 1000, 1100 and 1200¡ÆC for 2h were in the range of 10-20nm and narrow, respectively. The average size of the synthesized nanoparticles increased with increasing water to surfactant molar ratio. The synthesized CoA2O4 powders were characterized by X-ray diffraction analysis (XRD), Field emission scanning electron microscopy (FE-SEM) and Color spectrophotometer. The intensities of X-ray diffraction synthesized CoAl2O4 powder increased with increasing heating temperature. As increasing of the heating temperature, crystalline size of the synthesized powders is increased. As increasing of the R value(water/surfactant) and heating temperature, color of inorganic pigments is changed dark blue-green to cerulean blue.



Figure 1 FE-SEM image of CoAl2O4 nanoparticles synthesized at R=8 and various calcination
temperatures; (a) 900¡É, (b)1000¡É, (c) 1100¡É and (d) 1200¡É


References:

[1] R. K. Sharma and R. Ghose, Ceram. Int. 40 (2014) 3209.

Acknowledgements :