- Preparation of Silver-doped Hydroxyapatite Using Sol-gel Method
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Byung-Bae Mun, Ho-Kun Kim
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J Korean Powder Metall Inst. 2005;12(6):428-432.
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DOI: https://doi.org/10.4150/KPMI.2005.12.6.428
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 Abstract
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- In the present study, silver-doped antibacterial hydroxyapatites were successfully prepared by the sol-gel method. For the starting solution, the molar ratio of Ca(NO_3)_2cdot4H_2O, P(OC_2H_5)_3,;C_2H_5OH,;and;H_O was set to 0.075:0.045:20:0.135; AgNO_3 was added to a ratio of Ag to total cation concentration of 0.5-12 mol%. The prepared sol was dried at 100°C for 48h and heat-treated at 1000°C for 2h to obtain particles in the 200-500nm size range. The product from the synthesis of silver-doped hydroxyapatite was investigated through X-ray diffraction experiments and scanning electron microscopy. The product showed high antibacterial properties, with a disinfection ratio of Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 25922) over 99.9°C as calculated from an antimicrobial effects evaluation by the shake flask method.
- Synthesis and Characterization of Nanoporous Boehmite
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Ho-Kun Kim, Tae-Young Kim
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J Korean Powder Metall Inst. 2005;12(3):220-224.
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DOI: https://doi.org/10.4150/KPMI.2005.12.3.220
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Abstract
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- Boehmite (AlOOH) powder with uniform pore size and high specific surface area were synthesized via sol-gel method using metal salts, Al_2(SO_4)_3 and NaAlO_2. During these synthetic process, the effects of the aging time were investigated to determine the optimal synthetic conditions of boehmite. X-ray diffraction, BET, Raman/IR, and scanning electron microscopy techniques were used for the characterization of the powder. Boehmite gel synthesized at the first stage of the experimental procedure transformed to crystalline boehmite phase after aging for 6 hours. The specific surface area of the crystalline boehmite showed a maximum value, 350m2/g, at aging time of 72 hours. The pore size of the boehmite increased with increasing aging time and the boehmite with average pore diameter of 3.6 nm was obtained at aging time of 96 hours.
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