Aggregation-Based Crystal Growth and Microstructure Development in Natural Iron Oxyhydroxide Biomineralization Products

Author:

Banfield Jillian F.1,Welch Susan A.1,Zhang Hengzhong1,Ebert Tamara Thomsen2,Penn R. Lee3

Affiliation:

1. Department of Geology and Geophysics, University of Wisconsin–Madison, Madison, WI 53706, USA.

2. Diversions Scuba, Madison, WI 53705, USA.

3. Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference30 articles.

1. A number of experimental studies describe growth via oriented aggregation. For example this has been reported in anatase (TiO 2 ) under hydrothermal conditions [

2. Morphology development and crystal growth in nanocrystalline aggregates under hydrothermal conditions: insights from titania

3. ]. Also see (2–7).

4. Aggregation-based grown has been demonstrated in hematite (α-Fe 2 O 3 ) formed by aging of FeCl 3 in the presence of KH 2 PO 4 [

5. Growth Mechanisms of Iron Oxide Particles of Differing Morphologies from the Forced Hydrolysis of Ferric Chloride Solutions

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