Abstract
탄산칼슘의 Biomineralization 반응을 수행하기 위해 aspartic acid와 lysine을 <TEX>$CaCl_2$</TEX> 용액에 첨가하여 기-액 반응으로 염화칼슘과 <TEX>$NH_4HCO_3$</TEX>을 사용하여 탄산칼슘 결정화 실험을 하였다. 결정화 반응시간, aspartic acid와 lysine의 첨가양, <TEX>$CaCl_2$</TEX>의 양, <TEX>$NH_4HCO_3$</TEX>의 양을 변경하여 탄산칼슘 결정의 다형체인 calcite와 vaterite의 비를 조사하였다. 결정 분석을 수행하기 위해 FT-IR spectrometer(model IR Prestige-21, Shimadzu, Kyoto, Japan) 장치를 사용하였고 FT-IR 스펙트럼으로 calcite와 vaterite 결정을 확인하였다. <TEX>$CaCl_2$</TEX>의 양을 변경하였을 때, <TEX>$NH_4HCO_3$</TEX> 10 g에서 0.15 M의 <TEX>$CaCl_2$</TEX> 농도 전후에서 vaterite 결정의 증가가 감소로 변하다가 0.20M에서는 다시 증가하여 0.25 M에서 가장 많은 vaterite 결정이 관찰되었다. <TEX>$NH_4HCO_3$</TEX> 20 g에서는 0.10 M의 <TEX>$CaCl_2$</TEX>를 전환점으로 하여 vaterite 결정이 증가에서 감소추세를 보이다가 0.25M에서 다시 증가하는 것으로 나타났다. 첨가제로 lysine을 이용하였을 때는 반응시간이 2일을 기점으로 vaterite양의 증가가 감소로 변하였고 aspartic acid를 첨가하였을 때는 반대의 경향을 보였다. Crystallization of calcium carbonate were performed by adding aspartic acid and lysine into <TEX>$CaCl_2$</TEX> solution for understanding biomineralization in gas-liquid reaction of <TEX>$NH_4HCO_3$</TEX> and <TEX>$CaCl_2$</TEX>. Proportion between calcite and vaterite of calcium carbonate crystals was identified by changing conditions such as reaction time, addition amount of aspartic acid, lysine, <TEX>$CaCl_2$</TEX>, and <TEX>$NH_4HCO_3$</TEX>. FT-IR(Fourier Transform Infrared spectroscopy) instrument was used to perform analysis of vaterite ratio. Under the condition of <TEX>$NH_4HCO_3$</TEX> 10 g and no additive, an increase of vaterite crystal changed to a decrease around 0.15 M <TEX>$CaCl_2$</TEX>. Then it largely increased at 0.25 M <TEX>$CaCl_2$</TEX>, after vaterite proportion was rising again at 0.20 M <TEX>$CaCl_2$</TEX>. In contrast to that, vaterite crystal continuously decreased to 0.2 M <TEX>$CaCl_2$</TEX>, and increased from 0.25 M <TEX>$CaCl_2$</TEX> with 20 g <TEX>$NH_4HCO_3$</TEX>. Vaterite crystals were observed to be a maximum after 2days with lysine addition, but <TEX>$CaCO_3$</TEX> vaterite crystals showed minimum with aspartic acid.
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