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Controlled crystallization of vaterite from viscous solutions of organic colloids

Published online by Cambridge University Press:  31 January 2011

Ladislav Pach ,
Zdenek Hrabe ,
Sridhar Komarneni  and
Rustum Roy
Ladislav Pach
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-4801
Zdenek Hrabe
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-4801
Sridhar Komarneni
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-4801
Rustum Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802-4801
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Abstract

Precipitation of calcium carbonate from hydroxyethyl cellulose (HEC) containing aqueous solutions of CaCl2 and Na2CO3 resulted in an uncommon polymorph, vaterite. In contrast to precipitations without HEC, crystallization in the presence of HEC led to a shell-shaped body consisting of organized vaterite platelets. The artificial shell is a composite of stacks of vaterite and about 2% HEC. In the experimental arrangement used, HEC controlled both nucleation and crystal growth of vaterite. Concentration of HEC also affected the platelet's thickness which in turn influenced the shell's morphology as well. These results demonstrate the importance of organic-inorganic interface in controlling crystallization.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 12 , December 1990 , pp. 2928 - 2932
Copyright
Copyright © Materials Research Society 1990

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