A06 超音波霧化によるナノサイズ炭酸カルシウムの合成(口頭発表)

概要

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This study is concerned with synthesis of nano-size calcium carbonate by sonochemical atomization for reactive mizxing. The atomization hardly occurred at solution concentration over 1.5 mol/dm^3 at room temperature. The temperature of solution rose to 45 ℃ by atomizing. The mists of atomized CaCl_2 solution and Na_2CO_3 solution were reacted by reactive mixing. Calcium carbonate which was formed at an concentration of 0.2 mol/dm^3 contained calcite, vaterite and aragonite. Conventional liquid phase reaction at around room temperature did not generate aragonite, a stable form in higheatemperature solutions. The formation of aragonite at a decreased temperature is specific feature of this study. The particle size of formed calcium carbonate was approximately 1-2 μm and specific surface area was about 1-2 m^2/g. In the case of concentration of 1.0 mol/dm^3, the particle size of formed calcium carbonate was about 1 μm in aggregates composed of small particles of 0.1 μm. The specific surface area of formed calcium carbonate was about 10 m^2/g. Fine calcium carbonate was synthesized by sonochemical atomization for reactive mixing.
日本ソノケミストリー学会の論文
2008-12-05