Characterization of blue CoAl2O4 nano-pigment synthesized by ultrasonic hydrothermal method |
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| Authors: | Jin-Ho Kim Bo-Ram Son Dae-Ho Yoon Kwang-Taek Hwang Hyung-Goo Noh Woo-Seok Cho Ung-Soo Kim |
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| Affiliation: | 1. Icheon Branch, Korea Institute of Ceramic Engineering & Technology (KICET), Icheon-si, Gyeonggi-do, Republic of Korea;2. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Republic of Korea;3. Department of Design and Craft, Hongik University, Republic of Korea |
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| Abstract: | Nano-sized CoAl2O4 pigments, which have received significant attention as a coloring agent in glaze and bulk tile compositions, were successfully synthesized by substituting mechanical stirring during hydrothermal process with ultrasonic irradiation. Difference in physicochemical and optical properties of the CoAl2O4 pigments prepared by an ultrasonic-assisted-hydrothermal method was characterized using simultaneous thermo-gravimetric and differential thermal analysis (TG–DTA), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), diffuse reflectance spectroscopy, CIELAB colorimetric analysis, and testing in ceramic glazes and bodies. The ultrasonic-assisted CoAl2O4 pigments present a narrow particle size distribution with vivid blue color, and better thermal stability, allowing their use for ceramic inks processed at high temperature. Application of ultrasonic irradiation during the hydrothermal process produces nano-sized powders with better physicochemical and optical properties. |
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