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http://dx.doi.org/10.6111/JKCGCT.2019.29.6.372

Antibacterial properties of traditional ceramic glazes containing copper oxide  

Kim, Ung-Soo (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Choi, Jung-Hoon (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
No, Hyung-Goo (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Han, Kyu-Sung (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Kim, Jin-Ho (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Hwang, Kwang-Taek (Icheon Branch, Korea Institute of Ceramic Engineering and Technology)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.29, no.6, 2019 , pp. 372-378 More about this Journal
Abstract
Traditional ceramic glazes formulated with copper oxide (CuO) exhibited antibacterial properties on Staphylococcus aureus (Gram Positive) and Escherichia coli (Gram Negative). All the ceramic glazes containing CuO showed antibacterial behavior when fired in reducing atmosphere. However, some of copper glazes presented antibacterial behavior and had no antibacterial properties at all when sintered in an oxidizing atmosphere. To elucidate the antibacterial mechanism, ceramic glazes were studied for phase and microstructure analysis, dissolution behavior and surface zeta potential. Metallic copper was precipitated in the glaze layer when sintered in reducing atmosphere. Less than 0.05 ppm of Cu ion was dissolved from glazes. Ca ion was most dissolved among all the samples. Glaze surface was highly negatively charged when CuO was added over 3 wt.% regardless of the sintering atmosphere. The antibacterial behavior of ceramic glazes seemed to be directly related to the dissolution behavior of cations, but the antibacterial behavior of oxidized specimens was not explained by the dissolution behavior. Surface potential of ceramic glazes appeared to play an auxiliary role in antibacterial properties.
Keywords
Copper glaze; Copper oxide (II); Sintering; Crystalline phase; Ion dissolution; Surface zeta potential; Antibacterial property;
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