Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Microbial Production and Characterization of Superparamagnetic Magnetite Nanoparticles by Shewanella sp. HN-41

  • Lee, Ji-Hoon (Department of Environmental Science and Engineering, and International Environmental Research Center, Gwangju Institute of Science and Technology) ;
  • Roh, Yul (Faculty of Earth Systems and Environmental Sciences, Chonnam National University) ;
  • Hur, Hor-Gil (Department of Environmental Science and Engineering, and International Environmental Research Center, Gwangju Institute of Science and Technology)
  • Published : 2008.09.30
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Abstract

A facultative dissimilatory metal-reducing bacterium, Shewanella sp. strain HN-41, was used to produce magnetite nanoparticles from a precursor, poorly crystalline iron-oxyhydroxide akaganeite ($\beta$-FeOOH), by reducing Fe(III). The diameter of the biogenic magnetite nanoparticles ranged from 26 nm to 38 nm, characterized by dynamic light scattering spectrophotometry. The magnetite nanoparticles consisted of mostly uniformly shaped spheres, which were identified by electron microscopy. The magnetometry revealed the superparamagnetic property of the magnetic nanoparticles. The atomic structure of the biogenic magnetite, which was determined by extended X-ray absorption fine structure spectroscopic analysis, showed similar atomic structural parameters, such as atomic distances and coordinations, to typical magnetite mineral.

Keywords

References

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