The Effect of Additives on the Early Stages of Growth of Calcite Single Crystals


As crystallization processes are often rapid, it can be difficult to monitor their growth mechanisms. In this study, we made use of the fact that crystallization proceeds more slowly in small volumes than in bulk solution to investigate the effects of the soluble additives Mg2+ and poly(styrene sulfonate) (PSS) on the early stages of growth of calcite crystals. Using a "Crystal Hotel" microfluidic device to provide well-defined, nanoliter volumes, we observed that calcite crystals form via an amorphous precursor phase. Surprisingly, the first calcite crystals formed are perfect rhombohedra, and the soluble additives have no influence on the morphology until the crystals reach sizes of 0.1-0.5 μm for Mg2+ and 1-2 μm for PSS. The crystals then continue to grow to develop morphologies characteristic of these additives. These results can be rationalized by considering additive binding to kink sites, which is consistent with crystal growth by a classical mechanism.

DOI: 10.1002/anie.201706800

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@inproceedings{Kim2017TheEO, title={The Effect of Additives on the Early Stages of Growth of Calcite Single Crystals}, author={Yi-Yeoun Kim and Colin L Freeman and Xiuqing Gong and Mark A Levenstein and Yun-wei Wang and Alexander N. Kulak and Clara Anduix-Canto and Phillip A Lee and Shunbo Li and Li Chen and Hugo K. Christenson and Fiona C . Meldrum}, booktitle={Angewandte Chemie}, year={2017} }