- The Selective Leaching of Al-Ni Alloy Nano Powders Prepared by Electrical Wire Explosion
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Je-Shin Park, Won-Baek Kim, Chang-Youl Suh, Han-Kwon Chang, Jong-Gwan Ahn, Byoung-Kyu Kim
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J Korean Powder Metall Inst. 2008;15(4):308-313.
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DOI: https://doi.org/10.4150/KPMI.2008.15.4.308
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- Al-Ni alloy nano powders have been produced by the electrical explosion of Ni-plated Al wire. The porous nano particles were prepared by leaching for Al-Ni alloy nano powders in 20wt% NaOH aqueous solution. The structural properties of leached porous nano powder were investigated by nitrogen physisorption, X-ray diffraction (XRD) and transmission Microscope (TEM). The surface areas of the leached powders were increased with amounts of AI in alloys. The pore size distributions of these powders were exhibited maxima at range of pore diameters 3.0 to 3.5 nm from the desorption isotherm. The maximum values of those were decreased with amounts of Al in alloys.
- Preparation of Visible-light Responsive TiO2:Zr, N Photocatalysts by Polymer Complex Solution Method and Photo-degradation of NO
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Jae-Young Choi, Ji-Young Kim, Young-Hyuek Cho, Hee-Dong Jang, Han-Kwon Chang, Byoung-Gon Kim, Tae-Oh Kim
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J Korean Powder Metall Inst. 2008;15(1):13-17.
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DOI: https://doi.org/10.4150/KPMI.2008.15.1.013
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- Visible-light responsive TiO_2:Zr, N powders were prepared by polymer complex solution method and the particle properties were characterized by using transmission electron microscope, BET method, X-ray diffractometer and UV-Vis spectrophotometer. The photocatalytic reactivity of the catalysts was also estimated by analyzing NO degradation. Polyhedral TiO_2 powder having about 20 um in the average particle diameter was successfully prepared, The XRD analysis revealed that the as-prepared powder consisted of anatase and rutile phases. The light absorption of the as-prepared TiO_2:Zr, N powder was shifted to the visible light. In addition, the as-prepared TiO_2:Zr, N nanoparticles showed the higher photocatalytic activity than the commercial TiO_2 under both UV and visible lights.
- Metal Nano Powders as a New Getter Material
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Won-Baek Kim, Je-Shin Park, Chang-Youl Suh, Han-Kwon Chang, Jae-Chun Lee, Mi-Young Park
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J Korean Powder Metall Inst. 2007;14(1):56-62.
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DOI: https://doi.org/10.4150/KPMI.2007.14.1.056
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- Getter property of nano-sized metallic powders was evaluated as a possible candidate for the future getter material. For the purpose, Ti powders of about 50 nm were prepared by electrical wire explosion. Commercial Ti powders of about 22 micrometer were tested as well for comparison. The room-temperature hydrogen-sorption speed of nano-sized Ti powders was 1.34;L/seccdotcm2 which was more than 4 times higher than that of micron-sized ones. The value is comparable to or even higher than those of commercial products. Its sorption speed increases with activation temperature up to 500°C above which it deteriorates due to low-temperature sintering effect of nano-sized particles.
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