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Scanning force microspy study of biogenic nanoparticles for medical applications

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Albrecht,  M.
Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Schüler,  D.
Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Heyen,  U.
Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society;

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Citation

Albrecht, M., Janke, V., Sievers, S., Siegner, U., Schüler, D., & Heyen, U. (2005). Scanning force microspy study of biogenic nanoparticles for medical applications. Journal of Magnetism and Magnetic Materials, 290, 269-271.


Cite as: http://hdl.handle.net/21.11116/0000-0001-D051-8
Abstract
We present a combined atomic force microscopy (AFM) and magnetic force microscopy (MFM) study of bacterial magnetosomes, consisting of membrane-covered magnetite particles. AFM imaging unambiguously demonstrates the existence of single isolated magnetosomes with a size of about 40 nm, in addition to various clusters of magnetosomes. With MFM we have particularly addressed the magnetic properties of single magnetosomes. These nanoparticles behave like single mono-domain nanomagnets, as shown by the comparison of the MFM data to simple simulations. These simulations also provide information on the size of the magnetic kernel of the magnetosomes. Moreover, the invasiveness of the MFM tip is addressed.