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Title: Following iron speciation in the early stages of magnetite magnetosome biomineralization

Understanding magnetosome magnetite biomineralization is of fundamental interest to devising the strategies for bioinspired synthesis of magnetic materials at the nanoscale. Thus, we investigated the early stages of magnetosome formation in this work and correlated the size and emergent crystallinity of magnetosome nanoparticles with the changes in chemical environment of iron and oxygen by utilizing advanced analytical electron microscopy techniques. We observed that magnetosomes in the early stages of biomineralization with the sizes of 5–10 nm were amorphous, with a majority of iron present as Fe3+, indicative of ferric hydroxide. The magnetosomes with intermediate sizes showed partially crystalline structure with a majority of iron present as Fe3+ and trace amounts of Fe2+. The fully maturated magnetosomes were indexed to magnetite. Furthermore, our approach provides spatially resolved structural and chemical information of individual magnetosomes with different particle sizes, attributed to magnetosomes at different stages of biomineralization.
 [1] ;  [2] ;  [2] ;  [2] ;  [1]
  1. Ames Lab., Ames, IA (United States)
  2. Max Planck Institute of Colloids and Interfaces, Potsdam (Germany)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0884-2914; applab
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Materials Research
Additional Journal Information:
Journal Volume: 2016; Journal Issue: 2; Journal ID: ISSN 0884-2914
Materials Research Society
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
Country of Publication:
United States
59 BASIC BIOLOGICAL SCIENCES; 77 NANOSCIENCE AND NANOTECHNOLOGY; nucleation and growth; nanoscale; crystallographic structure