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Aragonite growth in water-alcohol mixtures: Classical or nonclassical crystallization?

Published online by Cambridge University Press:  21 May 2012

K. K. Sand ,
J. D. Rodriguez-Blanco ,
E. Makovicky ,
L. G. Benning  and
S. L. S. Stipp
K. K. Sand*
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
J. D. Rodriguez-Blanco
Affiliation:
School of Earth and Environment, University of Leeds, United Kingdom.
E. Makovicky
Affiliation:
Department for Geography and Geology, University of Copenhagen, Denmark.
L. G. Benning
Affiliation:
School of Earth and Environment, University of Leeds, United Kingdom.
S. L. S. Stipp
Affiliation:
Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
*
*Email: kks@nano.ku.dk
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Abstract

Aragonite can grow from calcium carbonate solutions as the favored phase, at ambient conditions, in the presence of 1:1 volume % water:ethanol. Its form is single and branched needles, with pseudohexagonal symmetry. Morphological evidence demonstrates that all precipitated aragonite is twinned. The recently popularized hypothesis of nonclassical growth by nanocrystal self assembly cannot describe the aragonite crystal form. Rather, its formation is effectively described as spherulitic growth, i.e. by classical crystal growth theory.

Keywords

crystal growthethanolself-assembly
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1419: Symposium NN – Nucleation and Growth of Biological and Biomimetic Materials , 2012 , mrsf11-1419-nn01-08
Copyright
Copyright © Materials Research Society 2012

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