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Journal of Nanoparticle Research

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01.08.2011 | Research Paper

Magnetic properties of single biogenic magnetite nanoparticles

verfasst von: J. D. Wei, I. Knittel, C. Lang, D. Schüler, U. Hartmann

Erschienen in: Journal of Nanoparticle Research | Ausgabe 8/2011

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Abstract

Biogenic magnetite nanoparticles (MNP) extracted from the magnetotactic bacterium Magnetospirillum gryphiswaldense MSR-1 have been systematically studied by atomic force microscopy (AFM) and magnetic force microscopy (MFM). Isolated single MNP and chains of MNP were obtained from diluted MNP aqueous suspension dried on mica surfaces in a homogeneous in-plane magnetic field. The size of the MNP was determined by employing AFM tip deconvolution procedures. The obtained result has been confirmed by scanning electronic microscopy. Magnetic properties of isolated single MNP and chains of MNP in remanence and in the presence of external magnetic fields were investigated by MFM. In particular, the magnetization reversal of a two-particle chain has been revealed and the dipolar interaction between the MNP is estimated. The change in the magnetic contrast on application of an external magnetic field is consistent with the hysteresis curve obtained by cantilever magnetometry.

Vorheriger Artikel Synthesis of quantum dots via microreaction: structure optimization for microreactor system

Nächster Artikel Amine-capped gold nanoparticles: reaction steps during the synthesis and the influence of the ligand on the particle size

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Titel: Magnetic properties of single biogenic magnetite nanoparticles
verfasst von: J. D. Wei
I. Knittel
C. Lang
D. Schüler
U. Hartmann
Publikationsdatum: 01.08.2011
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 8/2011
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-011-0357-4

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