- Synthesis of Silver Nano-particles by Homogeneous Precipitation
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Won-Mo Kang, Ho-Kun Kim
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J Korean Powder Metall Inst. 2008;15(5):386-392.
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DOI: https://doi.org/10.4150/KPMI.2008.15.5.386
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 Abstract
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- Silver particles were synthesized from silver nitrate by homogeneous precipitation and chemical reduction methods involving the intermediate silver cyanate. The obtained silver particles were characterized by XRD, SEM, TEM, and BET. Urea which could prevent the agglomeration of the reduced silver particles was used as a homogeneous precipitator. The spherical silver particles with average particle diameter of 100 nm were obtained under the optimum reaction conditions. The optimum synthetic conditions were found as follows: reaction temperature 100°C, reaction time 60 min, concentration of silver nitrate 1times10-2 mol, urea 5times10-3 mol, and sodium citrate 8.5times10-4 mol. The phase of obtained silver particles was crystalline state and the silver particles were relatively dense, which had the surface area of 0.7571;m2/g.
- Synthesis and Characterization of Nanoporous Zirconia
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Seung-Sik Woo, Ho-Kun Kim
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J Korean Powder Metall Inst. 2007;14(5):309-314.
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DOI: https://doi.org/10.4150/KPMI.2007.14.5.309
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- Zirconia powders with nano size pores and high specific surface areas were synthesized via aqueous precipitation and hydrothermal synthetic method using ZrOCl_28H_2O and NH_4OH under pH=11 and ambient condition. By this reaction. zirconia hydrate (ZrO_x(OH)_4-2x) was primarily synthesized and the obtained zirconia hydrate was heat treated hydrothermally using an autoclave at various temperatures under pH=11. X-ray diffraction, Scanning electron microscopy, Energy dispersive X-ray spectroscopy, FT-IR, Raman, Particle size analysis, DTA-TG, and BET techniques were used for the characterization of the powder. The synthesized zirconia showed an amorphous phase, however, the phase was transformed to the crystalline state during the hydrothermal process. The observed crystalline phase above 160°C was a mixed phase of monoclinic and tetragonal zirconia. By the BET analysis, it was found that the specific surface area was ranged in 126sim276m2/g and the zirconia had the cylindrical shaped pores with average diameter of 2sim7nm.
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Citations
Citations to this article as recorded by  - Characteristics of Zirconia Nanoparticles with Hydrothermal Synthesis Process
Chi Wook Cho, Weon Pil Tai, Hak Sung Lee
Applied Chemistry for Engineering.2014; 25(6): 564. CrossRef
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