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임준혁 ( Jun Heok Lim ),정헌석 ( Hun Seok Jung ),이희동 ( Hui Dong Lee ),안우영 ( Woo Yeong Ann ) 한국공업화학회 2010 응용화학 Vol.14 No.1
In the zinc powder fabrication process, about 5 to 10 wt% of zinc powder were unfit for the criteria of painting industry. The flake type zinc powder was produced from the residual product of zinc dust. In this study, the zinc dust were crashed in the attrition mill. Also, the operating condition of milling process were studied.
하이드록시 아파타이트를 이용한 fluorapatite 미립자 합성
임준혁 ( Jun Heok Lim ),정헌석 ( Hun Seok Jung ),장정국 ( Jung Goog Jang ),이경학 ( Gyeong Hak Lee ) 한국공업화학회 2010 응용화학 Vol.14 No.1
As an inorganic component of shark teeth and some exoskeletons of molluscs, fluoroapatite, Ca10(PO4)6F2, is a highly relevant biomineral. Human teeth consist mainly of carbonated hydroxyapatite, Ca5-x(PO4CO3)3OH, and do not contain high levels of fluoride (overall less than 0.1 wt %); on the surface of human teeth, between 0.05 and 0.1 wt % fluoride was found. However, the interaction between fluoride and calcium phosphate is important to understand the formation and dental protection of teeth. In this paper we report the synthesis of fluroapatite of various size and chemical composition under simple and relatively mild reaction conditions. Precipitation method and ultrasonic method were used for the fabrication of fluorapatite. And various solutions were used to different shape of fluorapatite. Using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and powder X-ray diffraction (XRD), the mechanism of how these structures formed was explored.