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Superstructures of Calcium Carbonate Crystals by Oriented Attachment

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journal contribution
posted on 06.07.2005, 00:00 by Nicole Gehrke, Helmut Cölfen, Nicola Pinna, Markus Antonietti, Nadine Nassif
Crystalline hexagonal-shaped superstructures of calcium carbonate, synthesized in the presence of ammonia, are shown to be assembled by a three-dimensional oriented attachment of vaterite nanoparticles. This unusual crystallographic lock-in mechanism enables the formation of complicated rounded structures with a crystallographic orientation from nanosized building blocks, which has so far only been found for transition metal systems.