SiO2, SnO2 코팅된 청색 CoAl2O4 안료의 색상, 물성 평가 연구
Coloration and Chemical Stability of SiO2 and SnO2 Coated Blue CoAl2O4 Pigment
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This work describes the coloration, chemical stability of SiO2 and SnO2-coated blue CoAl2O4 pigment. TheCoAl2O4, raw materials, were synthesized by a co-precipitation method and coated with silica (SiO2) and tin oxide(SnO2) using sol-gel method, respectively. To study phase and coloration of CoAl2O4, we prepared nano sized CoAl2O4pigments which were coated SiO2 and SnO2 using tetraethylorthosilicate, Na2SiO3 and Na2SnO3 as a coating material. Todetermine the stability of the coated samples and their colloidal solutions under acidic and basic conditions, colloidalnanoparticle solutions with various pH values were prepared and monitored over time. Blue CoAl2O4 solutions weretuned yellow color under all acidic/basic conditions. On the other hand, the chemical stability of SiO2 and SnO2-coatedCoAl2O4 solution were improved when all samples pH values, respectively. Phase stability under acidic/basic conditionof the core-shell type CoAl2O4 powders were characterized by transmission electron microscope, X-ray diffraction, CIEL*a*b* color parameter measurements.
Abstract
This work describes the coloration, chemical stability of SiO2 and SnO2-coated blue CoAl2O4 pigment. TheCoAl2O4, raw materials, were synthesized by a co-precipitation method and coated with silica (SiO2) and tin oxide(SnO2) using sol-gel method, respectively. To study phase and coloration of CoAl2O4, we prepared nano sized CoAl2O4pigments which were coated SiO2 and SnO2 using tetraethylorthosilicate, Na2SiO3 and Na2SnO3 as a coating material. Todetermine the stability of the coated samples and their colloidal solutions under acidic and basic conditions, colloidalnanoparticle solutions with various pH values were prepared and monitored over time. Blue CoAl2O4 solutions weretuned yellow color under all acidic/basic conditions. On the other hand, the chemical stability of SiO2 and SnO2-coatedCoAl2O4 solution were improved when all samples pH values, respectively. Phase stability under acidic/basic conditionof the core-shell type CoAl2O4 powders were characterized by transmission electron microscope, X-ray diffraction, CIEL*a*b* color parameter measurements.
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