Abstract
The precipitation of calcium carbonate (CaCO3) from saturated solutions prepared using calcium chloride and sodium hydrogen carbonate under the influence of ultrasound (20 kHz, intensity ranging from 1.5-18.5 W cm(-2)) has been studied. For short reaction times or treatment at low intensity, precipitates containing up to 90% vaterite were recovered; longer (> 30 min) times or higher intensities yielded up to 100% calcite. Changes in the crystal sizes were noted. The results are consistent with the literature model of CaCO3 crystallization by the initial formation of vaterite followed by a dissolution recrystallization process. Although a complete explanation cannot be offered, the results help to explain some of the apparently conflicting information previously published on this topic.
Original language | English |
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Pages (from-to) | 39-44 |
Number of pages | 6 |
Journal | Crystal Growth and Design |
Volume | 11 |
Issue number | 1 |
Early online date | 17 Nov 2010 |
DOIs | |
Publication status | Published - 5 Jan 2011 |