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High-Magnesium Calcite Mesocrystals: Formation in Aqueous Solution under Ambient Conditions.
Yu, Pao-Tao; Tsao, Chieh; Wang, Chun-Chieh; Chang, Chun-Yu; Wang, Chia-Hsin; Chan, Jerry Chun Chung.
Afiliação
  • Yu PT; Department of Chemistry, National (Taiwan) University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan.
  • Tsao C; Department of Chemistry, National (Taiwan) University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan.
  • Wang CC; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.
  • Chang CY; Department of Chemistry, National (Taiwan) University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan.
  • Wang CH; National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan.
  • Chan JCC; Department of Chemistry, National (Taiwan) University, No. 1, Section 4, Roosevelt Road, Taipei, 10617, Taiwan.
Angew Chem Int Ed Engl ; 56(51): 16202-16206, 2017 12 18.
Article em En | MEDLINE | ID: mdl-29094791
Mesocrystals of high-magnesian calcites are commonly found in biogenic calcites. Under ambient conditions, it remains challenging to prepare mesocrystals of high-magnesian calcite in aqueous solution. We report that mesocrystals of calcite with magnesium content of about 20 mol % can be obtained from the phase transformation of magnesian amorphous calcium carbonate (Mg-ACC) in lipid solution. The limited water content on the Mg-ACC surface would reduce the extent of the dissolution-reprecipitation process and bias the phase transformation pathway toward solid-state reaction. We infer from the selected area electron diffraction patterns and the dark-field transmission electron microscopic images that the formation of Mg-calcite mesocrystals occurs through solid-state secondary nucleation, for which the phase transformation is initiated near the mineral surface and the crystalline phase propagates gradually toward the interior part of the microspheres of Mg-ACC.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Taiwan

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Ano de publicação: 2017 Tipo de documento: Article País de afiliação: Taiwan