- Size Control and Optical Properties of ZnO nanoparticles by Zinc-Lithium-Acetate System
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Ri Yu, YooJin Kim
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J Korean Powder Metall Inst. 2013;20(5):371-375.
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DOI: https://doi.org/10.4150/KPMI.2013.20.5.371
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- ZnO nanoparticles in the size range from 5 to 15 nm were prepared by zinc-lithium-acetate system. The morphologies and structures of ZnO were characterized by TEM, XRD and FT-IR spectra. UV-visible results shows that the absorption of ZnO nanoparticles is blue shifted with decrease in particles size. Furthermore, photoluminescence spectra of the ZnO nanoparticles were also investigated. The ZnO nanoparticles have strong visible-emission intensity and their intensities depend upon size of ZnO nanoparticles.
- Color Evolution and Phase Transformation of α-FeOOH@SiO2 and β-FeOOH@SiO2 pigments
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Ri Yu, Kyoon Choi, Jae-Hwan Pee, YooJin Kim
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J Korean Powder Metall Inst. 2013;20(3):210-214.
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DOI: https://doi.org/10.4150/KPMI.2013.20.3.210
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- This manuscript reports on compared color evolution about phase transformation of alpha-FeOOH@SiO_2 and beta-FeOOH@SiO_2 pigments. Prepared alpha-FeOOH and beta-FeOOH were coated with silica for enhancing thermal properties and coloration of both samples. To study phase and color of alpha-FeOOH and beta-FeOOH, we prepared nano sized iron oxide hydroxide pigments which were coated with SiO_2 using tetraethylorthosilicate and cetyltrimethyl-ammonium bromide as a surface modifier. The silica-coated both samples were calcined at high temperatures (300, 700 and 1000°C) and characterized by scanning electron microscopy, CIE L*a*b* color parameter measurements, transmission electron microscopy and UV-vis spectroscopy. The yellow alpha-FeOOH and beta-FeOOH was transformed to alpha-Fe_2O_3 with red, brown at 300, 700°C, respectively.
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Citations to this article as recorded by  - Coloration and Chemical Stability of SiO2and SnO2Coated Blue CoAl2O4Pigment
JiYeon Yun, Ri Yu, Jae-Hwan Pee, YooJin Kim
Journal of Korean Powder Metallurgy Institute.2014; 21(5): 377. CrossRef
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