- Effect of Alumina Nanooxide Application on Nitrendipine Manufacturing Process
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E.J. Chae, Y.R. Uhm, B.S. Han, C.K. Rhee, S.E. Park
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J Korean Powder Metall Inst. 2007;14(2):127-131.
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DOI: https://doi.org/10.4150/KPMI.2007.14.2.127
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 Abstract
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- The alumina nano powders synthesized by levitational gas condensation (LGC) method were applied to catalyst in manufacturing process of Hanzsch reaction for Nitrendipine. The L-tartaric acid on the surface is carried out with participation of carbonyl fragments, O-H, C-H bonds which affects stereo selectivity, yield on the reagents positively. From the analysis of the IR-spectroscopy, the carbonyl fragments, O-H, and C-H bond were created by the catalytic reaction. From the analysis of the rR-spectroscopy, the carbonyl fragments, O-H, and C-H bond were created by the catalytic reaction. The newly created bonds made a chiral center on the final product.
- A study on the Particulate Properties of Ti-Ni alloy Nanopowders Prepared by Levitational Gas Condensation Method
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B.S. Han, Y.R. Uhm, M.K. Lee, G.M. Kim, C.K. Rhee
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J Korean Powder Metall Inst. 2006;13(6):396-400.
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DOI: https://doi.org/10.4150/KPMI.2006.13.6.396
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Abstract
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- The Ti-Ni alloy nanopowders were synthesized by a levitational gas condensation (LGC) by using a micron powder feeding system and their particulate properties were investigated by x-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) method. The starting Ti and Ni micron powders 150µm were incorporated into the micron powder feeding system. An ingot type of the Ti-Ni ahoy was used as a seed material for the levitation and evaporation reactions. The collected powders were finally passivated by oxidation. The x-ray diffraction experiments have shown that the synthesized powders were completely alloyed with Ti and Ni and comprised of two different cubic and monoclinic crystalline phases. The TEM results showed that the produced powders were very fine and uniform with a spherical particle size of 18 to 32nm. The typical thickness of a passivated oxide layer on the particle surface was about 2 to 3 nm. The specific surface area of the Ti-Ni alloy nanopowders was 60m2/g based on BET method.
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