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Science. 2000 Aug 4;289(5480):751-4.

Aggregation-based crystal growth and microstructure development in natural iron oxyhydroxide biomineralization products.

Author information

1
Department of Geology and Geophysics, University of Wisconsin-Madison, Madison, WI 53706, USA. jill@geology.wisc.edu

Abstract

Crystals are generally considered to grow by attachment of ions to inorganic surfaces or organic templates. High-resolution transmission electron microscopy of biomineralization products of iron-oxidizing bacteria revealed an alternative coarsening mechanism in which adjacent 2- to 3-nanometer particles aggregate and rotate so their structures adopt parallel orientations in three dimensions. Crystal growth is accomplished by eliminating water molecules at interfaces and forming iron-oxygen bonds. Self-assembly occurs at multiple sites, leading to a coarser, polycrystalline material. Point defects (from surface-adsorbed impurities), dislocations, and slabs of structurally distinct material are created as a consequence of this growth mechanism and can dramatically impact subsequent reactivity.

PMID:
10926531
DOI:
10.1126/science.289.5480.751
[Indexed for MEDLINE]
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