121st General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code MAT.P-338
Subject Fabrication of core/yolk-shell type iron-based pigments by mild basic solution
Authors RI YU, YOOJIN KIM*
Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technol, Korea
Abstract In this study, we fabricated the core/yolk-shell structure of iron-based pigments via facile etching treatment with mild basic solution. Iron based pigment can be controlled the coloration through the oxidation or cation exchange scuh as red, yellow, black. Red color hematite (α-Fe2O3) and red-yellow color akagneite (β-FeOOH) have attracted much interest owing to eco-friendly pigments. We studied the relation of shell structure and coloration of various iron-based pigments. Coating system is possible to protect the coloration of pigments and enhance their properties such as heat stability. We selected the silica (SiO2) as shell materials due to their prevent oxidation and aggregation. Silica-coated pigments were prepared via sol-gel method. And, the yolk-shell structure pigments were produced by dissolution of SiO2 shell with NH4OH solution. In particular, the density of the coating shell is important because it is associated with chromaticity. We confirmed that yolk-shell structure of iron-based pigments had a median chromaticity value. The morphology and coloration of each samples were investigated in detail by transmission electron microspocy(TEM), and CIE Lab color parameter measuremets.
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