Journal of Powder Materials

Synthesis and analysis CdSe Quantum dot with a Microfluidic Reactor Using a Combinatorial Synthesis System: Myung Hwan Hong, Duk-Hee Lee, Lee-Seung Kang, Chan Gi Lee, Bum-Sung Kim, Nam-Hoon Kim; J Korean Powder Metall Inst. 2016;23(2):143-148. Published online April 1, 2016; DOI: https://doi.org/10.4150/KPMI.2016.23.2.143

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Abstract PDF: A microfluidic reactor with computer-controlled programmable isocratic pumps and online detectors is employed as a combinatorial synthesis system to synthesize and analyze materials for fabricating CdSe quantum dots for various applications. Four reaction condition parameters, namely, the reaction temperature, reaction time, Cd/Se compositional ratio, and precursor concentration, are combined in synthesis condition sets, and the size of the synthesized CdSe quantum dots is determined for each condition. The average time corresponding to each reaction condition for obtaining the ultraviolet–visible absorbance and photoluminescence spectra is approximately 10 min. Using the data from the combinatorial synthesis system, the effects of the reaction conditions on the synthesized CdSe quantum dots are determined. Further, the data is used to determine the relationships between the reaction conditions and the CdSe particle size. This method should aid in determining and selecting the optimal conditions for synthesizing nanoparticles for diverse applications.

Fabrication and Characterization of Porous Nickel Membrane for High Precision Gas Filter by In-situ Reduction/Sintering Process: Nam-Hoon Kim, Han-Bok Song, Sung-Churl Choi, Yong-Ho Choa; J Korean Powder Metall Inst. 2009;16(4):262-267.; DOI: https://doi.org/10.4150/KPMI.2009.16.4.262

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Disk type porous nickel membrane was fabricated by in-situ reduction/sintering process using compacted NiO/PMMA (PMMA; Polymethyl methacrylate) mixture at 800°C in hydrogen atmosphere. The porosity (49sim58%) of these membrane was investigated as an amount of PMMA additive. The thermal decomposition and reduction behavior of NiO/PMMA were analyzed by TG/DTA in hydrogen atmosphere and the activation energy for the hydrogen reduction of NiO and thermal degradation of PMMA was calculated as 61.1 kJ/mol, evaluated by Kissinger method. Finally, the filtering performance and pressure drop were measured by particle counting system.

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Fabrication of Porous Ni by Freeze Drying and Hydrogen Reduction of NiO/Camphene Slurry
Jae-Hun Jeong, Sung-Tag Oh, Chang-Yong Hyun
Journal of Korean Powder Metallurgy Institute.2019; 26(1): 6. CrossRef
Fabrication of Porous W by Heat Treatment of Pore Forming Agent of PMMA and WO3 Powder Compacts
Ki Cheol Jeon, Young Do Kim, Myung-Jin Suk, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2015; 22(2): 129. CrossRef
Fabrication of Porous Cu by Freeze-drying Process of Camphene Slurry with CuO-coated Cu Powders
Su-Ryong Bang, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2014; 21(3): 191. CrossRef
Fabrication of Porous Ti by Freeze-Drying and Heat Treatment of TiH2/Camphene Slurries
한길 서, 명진 석, 영도 김, 승탁 오
Korean Journal of Materials Research.2013; 23(6): 339~343. CrossRef
Freeze Drying for Porous Mo with Sublimable Vehicles of Eutectic System
Gyu-Tae Lee, Han Gil Seo, Myung-Jin Suk, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2013; 20(4): 253. CrossRef

Fabrication of Sn and SnO₂ Nanopowders by Low-Temperature Phase Transformation Method: Kun-Jae Lee, Yeon-Jun Joo, Yong-Dae So, Nam-Hoon Kim, Jai-Sung Lee, Yong-Ho Choa; J Korean Powder Metall Inst. 2006;13(1):46-51.; DOI: https://doi.org/10.4150/KPMI.2006.13.1.046

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Abstract PDF: Through the volume change of Sn in a low-temperature phase transformation, the Sn nanopowder with high, purity, was fabricated by an economic and eco-friendly process. The fine cracks were spontaneously generated. in, Sn ingot, which was reduced to powders in the repetition of phase transformation. The Sn nanopowder with 50 run in size was obtained by the 24th repetitions of phase transformation by low-temperature and ultrasonic treatments. Also, the SnO_2 powder was fabricated by the oxidation of the produced Sn powder to the ingot and milled by the ultrasonic milling method. The SnO_2 nanopowder of 20 nm in size was fabricated after the milling for 180 h.

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