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Biomimetic control of crystal assembly by growth in an organic hydrogel network

: Grassmann, O.; Neder, R.; Putnis, A.; Löbmann, P.

American Mineralogist 88 (2003), Nr.4, S.647-652
ISSN: 0003-004X
ISSN: 1945-3027
Fraunhofer ISC ()

Calcite aggregates are mineralized in an organic poly-acrylamide hydrogel using a counter diffusion arrangement. The particles obtained show a characteristic pseudo-octahedral morphology, which is unexpected for calcite crystals. Scanning and transmission electron microscopy reveal a microstructure composed of individual highly aligned calcite crystallites. Although the aggregates consist of independent crystallites, the X-ray diffraction patterns suggest calcite single crystals. By analogy with some biominerals, the inorganic assembly is intergrown with an organic hydrogel network. A specific model is proposed for growth of the aggregate.