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Polymorph Switching of Calcium Carbonate Crystals by Polymer-Controlled Crystallization

✍ Scribed by An-Wu Xu; Wen-Fei Dong; Markus Antonietti; Helmut Cölfen

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
264 KB
Volume
18
Category
Article
ISSN
1616-301X

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✦ Synopsis

Abstract

Polymer‐controlled crystallization of calcium carbonate crystals in solution by a gas diffusion method has been carried out in the presence of poly(sodium 4‐styrene sulfonate‐co‐N‐isopropylacrylamide) (PSS‐co‐PNIPAAM), and for the first time all three anhydrous polymorphs, calcite, vaterite, and aragonite could be selectively produced with a single additive. The selective polymorph synthesis can be nicely adjusted simply by concentration variations of polymer and calcium ions in the present reaction system. The simplicity of the system reveals the influence of Ca^2+^ and polymer concentration on the nucleation and crystal growth of CaCO~3~ via the balance between thermodynamic and kinetic reaction control. A single mechanistic framework employing particle mediated as well as ion mediated crystallization for polymorph control is proposed.

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