Formation of metastable vaterite crystals in a polymer matrix by gaseous diffusion

• MICHAEL W PITCHER ^[1] ; ABDOLLAH NESHAT ^[2] ; SEMIH SEYYIDOGLU ^[1]
  1. [1] Middle East Technical University

     Middle East Technical University

     Turquía

     
  2. [2] University of Toledo

     University of Toledo

     City of Toledo, Estados Unidos

     
• Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 53, Nº. 2, 2008, págs. 1525-1526
• Idioma: inglés
• Enlaces
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• Resumen

  • A composite consisting of a polymer and calcium carbonate has been synthesized by allowing carbon dioxide to diffuse into a poly(ethylene oxide) film containing a source of calcium ions. The X-ray pattern of the synthetic composite material shows that the least thermodynamically stable polymorph of calcium carbonate, vaterite is the mineral phase which is formed, rather than the most thermodynamically stable calcite phase. This effect has been seen in other reports of crystallization of inorganic phases which have been mediated by a polymer matrix and/or other organic moieties. In this paper, some possible explanations are presented which may help explain this phenomenon.