- Effects of Nano FexC Addition on Superconducting Properties of MgB2
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Dong-Gun Lee, Ji-Hyun Lee, Byung-Hyuk Jun, Soon-Dong Park, Young-Rang Uhm, Hai-Woong Park, Chan-Joong Kim
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J Korean Powder Metall Inst. 2012;19(2):146-150.
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DOI: https://doi.org/10.4150/KPMI.2012.19.2.146
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- The effects of nano Fe_xC addition to superconducting properties of in situ processed MgB_2 superconductors was examined. 0.1 wt.% and 1 wt.% nano Fe_xC powders were mixed with boron and magnesium powders by ball milling. The powder mixtures were made into pellets by uniaxial pressing. The pellets were heat-treated at 700°C-900°C in argon atmosphere for MgB_2 formation. It was found by powder X-ray diffraction that the raw powders were completely converted into MgB_2 after the heat treatment. The superconducting transition temperature (T_c) and critical current density (J_c), estimated from susceptibility-temperature and M-H curves, were decreased by nano Fe_xC addition. The T_c and J_c decrease by nano Fe_xC addition are attributed to the incorporation of iron and carbon with MgB_2 lattices (Fe substitution for Mg and C substitution for B) due to the high reactivity of the nano Fe_xC powder.
- Response Characteristics of Electrochemical Non-enzyme Immunosensor using Fe3O4 Nanoparticle
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Chang-Kyu Kim, Gyoung-Ja Lee, Young-Rang Uhm, Min-Ku Lee, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2009;16(3):180-184.
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DOI: https://doi.org/10.4150/KPMI.2009.16.3.180
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- In this paper, the electrochemical non-enzyme immunosensor has been developed for the determination of salmonella antigen, using inverse voltammetry. For the estimation of salmonella antigen concentration, the Fe_3O_4 nanoparticles synthesized by microemulsion method were conjugated with salmonella antigen. Then, the immunocomplex between antibody immobilized on the transducer surface and antigen containing a magnetic nanoparticles was formed. From the linear relationship between the reduction peak current of Fe(III) and salmonella antigen concentration, it is suggested that the electrochemical non-enzyme biosensor is applicable to detect salmonella antigen in the concentration range of 101-105 CFU/ml.
- The Fabrication of PVA Polymer Coated on the Surface of B4C Nanocomposite by High Energy Ball Mill
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Young-Rang Uhm, Jae-Woo Kim, Jin-Woo Jung, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2009;16(2):110-114.
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DOI: https://doi.org/10.4150/KPMI.2009.16.2.110
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- Mechanical coating process was applied to form 89 %-hydrolyzed poly vinyl alcohol (PVA) onto boron carbide (B_4C) nanopowder using one step high energy ball mill method. The polymer layer coated on the surface of B4C was changed to glass-like phase. The average particle size of core/shell structured B_4C/PVA was about 50 nm. The core/shell structured B_4C/PVA was formed by dry milling. However, the hydrolyzed PVA of 98sim99% with high glass transition temperature (T_g) was rarely coated on the powder. The T_g of polymer materials was one of keys for guest polymer coating on to the host powder by solvent free milling.
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Citations
Citations to this article as recorded by  - Effect of Roasting Time and Cryogenic Milling on the Physicochemical Characteristics of Dried Ginseng Powder
Hayeong Jeong, Dong Hyeon Park, Han Geuk Seo, Mi-Jung Choi, Youngjae Cho
Foods.2020; 9(2): 223. CrossRef - The Effect of Milling Conditions for Dissolution Efficiency of Valuable Metals from PDP Waste Panels
Hyo-Seob Kim, Chan-Mi Kim, Chul-Hee Lee, Sung-Kyu Lee, Hyun-Seon Hong, Jar-Myung Koo, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2013; 20(2): 107. CrossRef - Characteristics of Indium Dissolution of Waste LCD Panel Powders Fabricated by High Energy Ball Milling (HEBM) Process with Milling Time
Hyo-Seob Kim, Jun-Je Sung, Cheol-Hee Lee, Hyun-Seon Hong, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2011; 18(4): 378. CrossRef - Refinement Behavior of Coarse Magnesium Powder by High Energy Ball Milling (HEBM)
Joon-Woo Song, Hyo-Seob Kim, Hong-Moule Kim, Taek-Soo Kim, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2010; 17(4): 302. CrossRef - Effect of Initial Silicon Scrap Size on Powder Refining Process During High Energy Ball Milling (HEBM)
Joon-Woo Song, Hyo-Seob Kim, Sung-Shin Kim, Jar-Myung Koo, Soon-Jik Hong
Journal of Korean Powder Metallurgy Institute.2010; 17(3): 242. CrossRef
- Determination of Fractal Dimension and Surface Characterization of Metal Nano-powder Using Nitrogen Gas Adsorption Method
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Gyoung-Ja Lee, Young-Rang Uhm, Chang-Kyu Rhee
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J Korean Powder Metall Inst. 2007;14(6):391-398.
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DOI: https://doi.org/10.4150/KPMI.2007.14.6.391
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160
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- The surface roughness of Al, Ag and Ni nano-powders which were prepared by pulsed wire evaporation method was quantified based upon the fractal theory. The surface fractal dimensions of metal nano-powders were determined from the linear relationship between In V/V_mono and Inln (Po/P) using multi-layer gas adsorption theory. Moreover, the fractal surface image was realized by computer simulation. The relationship between preparation condition and surface characteristics of metal nano-powders was discussed in detail.
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Citations
Citations to this article as recorded by - Electrophoretic deposition of Ni nanoparticles from suspension on to a Ni plate
Keun-Yong Park, Young Rang Uhm, Kwang Jae Son, Deok-Yong Park
Research on Chemical Intermediates.2015; 41(9): 6721. CrossRef
- Synthesis of Multiferroic Nanocomposites by a Polyol Method
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In-Bo Shim, Jeffrey Pyun, Yong-Wook Park, Young-Rang Uhm, Chul-Sung Kim
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J Korean Powder Metall Inst. 2007;14(3):180-184.
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DOI: https://doi.org/10.4150/KPMI.2007.14.3.180
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210
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- The material design and synthesis are of important to modem science and technology. Here, we report the synthesis of multifunctional nanomaterials with different properties: feroelecties YMnO_3 and multiferroic materials such as CoFe_2O_4-YMnO_3,;Fe_3O_4-YMnO_3,;CoFe_2O_4-Cd_0.85Zn_0.15S,;and;Fe_3O_4-Cd_0.85Zn_0.15S nano-composites by using a chemical synthesis process. These results provide a simple and convenient synthesis process to produce multifunctional nanocomposites.
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Citations
Citations to this article as recorded by - Structure, morphology, infra-red and dielectric investigations in Er+3doped nano phased lithium-barium-strontium-sodium niobates
S Bheemeswara Rao, P Viswarupachary, D M Potukuchi
Materials Research Express.2019; 6(6): 066562. CrossRef
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