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Issue 8, 2004
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Sonochemical synthesis of aragonite-type calcium carbonate with different morphologies

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Abstract

Aragonite, a high-pressure polymorph of CaCO3, was synthesized for the first time from simple Ca(HCO3)2 solutions by using high-power ultrasound irradiation. XRD, FT-IR and SEM techniques were used to characterize the phase composition and morphology of the products. The intensity of the ultrasound irradiation was found to have a remarkable effect on the morphology of the as-synthesized aragonite. The morphology evolved from rod-shaped to spindle-shaped when the acoustic amplitude is increased from 50% to 70% of the full amplitude. A possible mechanism for the formation of this controllable aragonite formation is proposed. The dissolved CO2 plays a crucial role in the homogeneous nucleation and growth of aragonite under sonication. Vaterite with flower- or dendrite-like structures could also be obtained by using 75% or 80% of the full acoustic amplitude, respectively. A nonequilibrium kinetics process controls the formation of unstable vaterite with unusual structures.

Graphical abstract: Sonochemical synthesis of aragonite-type calcium carbonate with different morphologies

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Article information


Submitted
24 Nov 2003
Accepted
01 Apr 2004
First published
15 Jul 2004

New J. Chem., 2004,28, 1027-1031
Article type
Paper

Sonochemical synthesis of aragonite-type calcium carbonate with different morphologies

G. Zhou, J. C. Yu, X. Wang and L. Zhang, New J. Chem., 2004, 28, 1027
DOI: 10.1039/B315198K

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