| Effects of Viscosity on Dispersion Stability of Nano CoAl2O4 Ceramic Ink |
| Ji-Hyeon Lee, Hae-Jin Hwang1, Jin-Ho Kim, Kwang-Taek Hwang, Kyu-Sung Han |
Ceramicware Center, Korea Institute of Ceramic Engineering and Technology
1Division of Material Science and Engineering, Inha University |
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| ABSTRACT |
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Inkjet printing is a widespread technology, offering advantages such as high-quality decoration, a continuous process, and the accurate direct reproduction of patterns or pictures. In inkjet printing technology, the dispersion stability of ceramic ink is one of the most important factors. In this study, the dispersion stability of blue $CoAl_2O_4$ ink for ceramic inkjet printing is systematically investigated. Blue $CoAl_2O_4$ pigment was synthesized by a solid-state reaction and then milled to less than 300nm in size. In order to investigate the influence of the viscosity on the dispersion stability, two types of $CoAl_2O_4$ ceramic inks (termed here Blue L and Blue H) were prepared using different volume ratios of ethylene glycol and ethanol. The Blue L and Blue H ink solutions contained cetyltrimethylammonium bromide(CTAB) as a dispersive agent. The viscosity, surface tension and jetting stability of the $CoAl_2O_4$ ceramic inks were analyzed using a rheometer, a surface tension meter and a dropwatcher. The dispersion stability of the $CoAl_2O_4$ ceramic ink was investigated by a multiple light-scattering method. Blue H, a ceramic ink with higher viscosity, showed much better dispersion stability than the Blue L ceramic ink. |
| Key words:
Blue ceramic ink, $CoAl_2O_4$, Dispersion stability, Viscosity, Multiple light scattering, Raw material |
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