Characteristics of hollow microtubes consisting of amorphous iron oxide nanoparticles produced by iron oxidizing bacteria, Leptothrix ochracea

H. Hashimoto, S. Yokoyama, H. Asaoka, Y. Kusano, Y. Ikeda, Masaharu Seno, J. Takada, Tatsuo Fujii, Makoto Nakanishi, R. Murakami

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Some features of characteristic iron oxide sheaths which the iron oxidizing bacteria Leptothrix ochracea (L. oceracea) formed were studied in order to make clear their morphology microstructure, chemical composition, and crystal structure through scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and X-ray diffraction (XRD). Each sheath was a hollow tube with average outer and inner diameters of 1.1 and 1.4 μm, respectively. Their length ranged from 10 to 200 μm and the aspect ratio was 10-200. Each sheath was constructed by very small particles with a diameter of less than 100 nm. The hollow sheaths were mainly composed of Fe and O with small amounts of Si and P. The chemical composition analyzed by EDX was roughly Fe:Si:P=80:15:5 with the exception of O. XRD measurement revealed that crystal structures of the sheath were similar to that of 2-line ferrihydrite. The sheath showed spin-glass-like magnetic properties.

Original languageEnglish
Pages (from-to)2405-2407
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - Mar 2007

Fingerprint

Iron oxides
iron oxides
sheaths
bacteria
hollow
Bacteria
Iron
Crystal structure
Nanoparticles
iron
X ray diffraction
nanoparticles
Spin glass
Chemical analysis
Aspect ratio
Magnetic properties
x ray spectroscopy
Microstructure
Scanning electron microscopy
chemical composition

Keywords

  • 2-line ferrihydrite
  • Chemical composition
  • Hollow sheath
  • Iron oxidizing bacteria
  • Leptothrix ochracea

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Characteristics of hollow microtubes consisting of amorphous iron oxide nanoparticles produced by iron oxidizing bacteria, Leptothrix ochracea. / Hashimoto, H.; Yokoyama, S.; Asaoka, H.; Kusano, Y.; Ikeda, Y.; Seno, Masaharu; Takada, J.; Fujii, Tatsuo; Nakanishi, Makoto; Murakami, R.

In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 3, 03.2007, p. 2405-2407.

Research output: Contribution to journalArticle

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