Polymorph control of calcium carbonate on the surface of mesoporous silica

Kwang Min Choi, Kazuyuki Kuroda

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The influence of mesoporous silica on the polymorph selectivity in CaCO 3 has been investigated. Vaterite is selectively formed from an aqueous solution containing CaCl 2 and Na 2CO 3 by precipitation under the presence of KIT-6-type mesoporous silica. Crystallization time of vaterite from amorphous calcium carbonate (ACC) is much longer on the addition of KIT-6 than that reported previously, indicating the remarkable stabilization of ACC on the surface of mesoporous silica. Other types of silica affect the polymorph selectivity; the addition of amorphous silica gel or assembled silica nanoparticles 12 nm in particle size induced the formation of vaterite as a main phase whereas the presence of assembled silica nanoparticles 30 nm in particle size resulted in the formation of calcite as a main phase with a minor component of vaterite. Therefore, the porous nature of the surfaces of silica greatly influences the polymorph, and a sort of "surface confinement" should play a major role in the selectivity of polymorph.

Original languageEnglish
Pages (from-to)887-893
Number of pages7
JournalCrystal Growth and Design
Volume12
Issue number2
DOIs
Publication statusPublished - 2012 Feb 1

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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