- Synthesis of Nickel and Copper Nanopowders by Plasma Arc Evaporation
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Young-Sang Cho, Jong Woo Moon, Kook Chae Chung, Jung-Goo Lee
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J Powder Mater. 2013;20(6):411-424.
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DOI: https://doi.org/10.4150/KPMI.2013.20.6.411
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- In this study, the synthesis of nickel nanoparticles and copper nanospheres for the potential applications of MLCC electrode materials has been studied by plasma arc evaporation method. The change in the broad distribution of the size of nickel and copper nanopowders is successfully controlled by manifesting proper mixture of gas ambiance for plasma generation in the size range of 20 to 200 nm in diameter. The factors affecting the mean diameter of the nanopowder was studied by changing the composition of reactive gases, indicating that nitrogen enhances the formation of larger particles compared to hydrogen gas. The morphologies and particle sizes of the metal nanoparticles were observed by SEM, and ultrathin oxide layers on the powder surface generated during passivation step have been confirmed using TEM. The metallic FCC structure of the nanoparticles was confirmed using powder X-ray diffraction method.
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Citations
Citations to this article as recorded by  - Tribological properties and tribomechanism of nickel nanoparticles in-situ synthesized in rapeseed oil
Wenya Xu, Guangbin Yang, Shengmao Zhang, Jun Xu, Yujuan Zhang, Tianhua Sun, Ningning Song, Laigui Yu, Pingyu Zhang
Friction.2024; 12(3): 474. CrossRef - Arc Discharge Synthesis of Chitosan‐Mediated Copper Nanoparticles for Heterogeneous Catalysis in 4‐Nitrophenol Degradation
Noor Azfarena Ahmad, Mohammad Taghi Hajibeigy, Mohsen Nabi Poor, Aras Kartouzian, Hassan Moeini, Kamyar Shameli
Particle & Particle Systems Characterization.2023;[Epub] CrossRef - Functional metal powders: Design, properties, applications, and prospects
Xin Wang, Haitao Yang, Xiaohua Yu, Chaoquan Hu, Jiacheng Hu, Rongxing Li, Yingzhi Zhang
Materials Science and Engineering: B.2022; 280: 115708. CrossRef - Facile synthesis of Cu and CuO nanoparticles from copper scrap using plasma arc discharge method and evaluation of antibacterial activity
S. B. Tharchanaa, K. Priyanka, K. Preethi, G. Shanmugavelayutham
Materials Technology.2021; 36(2): 97. CrossRef - Fabrication of Hollow or Macroporous Silica Particles by Spray Drying of Colloidal Dispersion
Young-Sang Cho
Journal of Dispersion Science and Technology.2016; 37(1): 23. CrossRef - Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules
Y.-S. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1221. CrossRef
- Fabrication of Micro Pattern on Flexible Substrate by Nano Ink using Superhydrophobic Effect
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Soo-Jung Son, Young-Sang Cho, Jong Joo Rha, Chul-Jin Cho
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J Powder Mater. 2013;20(2):120-124.
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DOI: https://doi.org/10.4150/KPMI.2013.20.2.120
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- This study is carried out to develop the new process for the fabrication of ultra-fine electrodes on the flexible substrates using superhydrophobic effect. A facile method was developed to form the ultra-fine trenches on the flexible substrates treated by plasma etching and to print the fine metal electrodes using conductive nano-ink. Various plasma etching conditions were investigated for the hydrophobic surface treatment of flexible polyimide (PI) films. The micro-trench on the hydrophobic PI film fabricated under optimized conditions was obtained by mechanical scratching, which gave the hydrophilic property only to the trench area. Finally, the patterning by selective deposition of ink materials was performed using the conductive silver nano-ink. The interface between the conductive nanoparticles and the flexible substrates were characterized by scanning electron microscope. The increase of the sintering temperature and metal concentration of ink caused the reduction of electrical resistance. The sintering temperature lower than 200°C resulted in good interfacial bonding between Ag electrode and PI film substrate.
- Manufacturing of Micro Gas Bearing by Fe-Ni Nanopowder and Metal Mold Using LIGA
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Soo-Jung Son, Young-Sang Cho, Dae-Jung Kim, Jong-Hyun Kim, Suk-Sang Chang, Chul-Jin Choi
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J Korean Powder Metall Inst. 2012;19(2):140-145.
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DOI: https://doi.org/10.4150/KPMI.2012.19.2.140
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- This paper describes the manufacturing process of tilting pad gas bearing with a diameter of 5 mm and a length of 0.5-1 mm for power MEMS (Micro Electomechanical Systems) applications. The bearing compacts with nanopowder feedstock were prepared by Ni-metal mold with 2-mold system using LIGA process. The effect of the manufacturing conditions on sintering properties of nanopowder gas bearing was investigated. In this work, Fe-45 wt%Ni nanopowder with an average diameter of 30-50 nm size was used as starting material. After mixing the nanopowder and the wax-based binders, the amount of powder was controlled to obtain the certain mixing ratio. The nanopowder bearing compacts were sintered with 1-2 hr holding time under hydrogen atmospheres and under temperatures of 600°C to 1,000°C. Finally, the critical batch of mixed powder system was found to be 70% particle fraction in total volume. The maximum density of the sintered bearing specimen was about 94% of theoretical density.
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Citations
Citations to this article as recorded by - A comprehensive review on advancements in compliant structures of gas foil journal bearings
Srusti Priyadarshini, Suraj K Behera
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology.2024;[Epub] CrossRef
- Fabrication of Ordered or Disordered Macroporous Structures with Various Ceramic Materials from Metal Oxide Nanoparticles or Precursors
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Young-Sang Cho, Jun-Hyuk Moon, Young-Kuk Kim, Chul-Jin Choi
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J Korean Powder Metall Inst. 2011;18(4):347-358.
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DOI: https://doi.org/10.4150/KPMI.2011.18.4.347
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- Two different schemes were adopted to fabricate ordered macroporous structures with face centered cubic lattice of air spheres. Monodisperse polymeric latex suspension, which was synthesized by emulsifier-free emulsion polymerization, was mixed with metal oxide ceramic nanoparticles, followed by evaporation-induced self-assembly of the mixed hetero-colloidal particles. After calcination, inverse opal was generated during burning out the organic nanospheres. Inverse opals made of silica or iron oxide were fabricated according to this procedure. Other approach, which utilizes ceramic precursors instead of nanoparticles was adopted successfully to prepare ordered macroporous structure of titania with skeleton structures as well as lithium niobate inverted structures. Similarly, two different schemes were utilized to obtain disordered macroporous structures with random arrays of macropores. Disordered macroporous structure made of indium tin oxide (ITO) was obtained by fabricating colloidal glass of polystyrene microspheres with low monodispersity and subsequent infiltration of the ITO nanoparticles followed by heat treatment at high temperature for burning out the organic microspheres. Similar random structure of titania was also fabricated by mixing polystyrene building block particles with titania nanoparticles having large particle size followed by the calcinations of the samples.
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Citations
Citations to this article as recorded by - Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules
Y.-S. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1221. CrossRef
- Synthesis of Gold Nanoparticles by Chemical Reduction Method for Direct Ink Writing
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Young-Sang Cho, Soo-Jung Son, Young-Kuk Kim, Kook-Chae Chung, Chul-Jin Choi
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J Korean Powder Metall Inst. 2010;17(5):390-398.
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DOI: https://doi.org/10.4150/KPMI.2010.17.5.390
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- Aqueous gold nanoparticle dispersion was synthesized by chemical reduction method using diethanolamine as reducing agent and polyethyleneimine as dispersion stabilizer. The synthesis conditions for the stable dispersion of the gold nanoparticle suspension were determined by changing the amount of the reducing agent and dispersant during the wet chemical synthesis procedures. The face centered cubic lattice structure of the gold nanoparticles was confirmed by using X-ray diffraction and the morphologies of the nanoparticles were observed by transmission electron microscope. The synthesized gold nanoparticle dispersion was concentrated by evaporating the dispersion medium at room temperature followed by the addition of ethyleneglycol as humectant for the increase of the elastic properties to obtain gold nanoparticle inks for direct ink writing process. The line patterns were obtained with the gold nanoparticle inks during the writing procedures and the morphologies of the fine patterns were observed by scanning electron microscope.
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Citations
Citations to this article as recorded by - Fabrication Of Colloidal Clusters Decorated With Dye Molecules For Potential Application As Photonic Molecules
Y.-S. Cho
Archives of Metallurgy and Materials.2015; 60(2): 1221. CrossRef - Synthesis of Nickel and Copper Nanopowders by Plasma Arc Evaporation
Young-Sang Cho, Jong Woo Moon, Kook Chae Chung, Jung-Goo Lee
Journal of Korean Powder Metallurgy Institute.2013; 20(6): 411. CrossRef - Low Temperature Debinding Process Using Oxygen Plasma for Flexible Printed Electronics
Young-In Lee
Journal of Korean Powder Metallurgy Institute.2012; 19(5): 343. CrossRef - Fabrication of Fecralloy Foil Coated by Fecralloy Nanoparticles Using Electrospray Processing
Jung-Yeul Yun, Sang-Sun Yang, Hye-Young Koo, Hye-Moon Lee
Journal of Korean Powder Metallurgy Institute.2011; 18(6): 526. CrossRef
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