Synthesis of Spherical Calcite Hollow Particles and their Excellent Morphological Stability

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  • 球状カルサイト中空粒子の合成とその形態安定性
  • キュウジョウ カルサイト チュウクウ リュウシ ノ ゴウセイ ト ソノ ケイタイ アンテイセイ

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Abstract

Novel technique to prepare calcite hollow particles controlling heating process of vaterite hollow particles as base particles has been developed. The vaterite hollow particles, whose shell surface consists of nano-sized particles, were previously synthesized by dissolving of carbon dioxide gas in calcium chloride aqueous solution. Vaterite transforms into calcite phase at near 500℃. Activation energy of the transformation calculated by Arrhenius plot indicated that transformation of the vaterite hollow particle to calcite phase successfully occurred. With increase in heating temperature up to 600℃, surface roughness became smooth. However, spherical shape and hollow structure remained. In addition, the calcite hollow particle showed excellent morphological stability after immersion in water for one month.

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