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Biogenic vs. abiogenic magnetite nanoparticles: A XMCD study

By Claire Carvallo, Philippe Sainctavit, Marie-Anne Arrio, N. Menguy, Yuheng Wang, Georges Ona-Nguema and Sandrine Brice-Profeta

Abstract

International audienceX-ray magnetic circular dichroism (XMCD) experiments were carried out to compare the Fe2+/Fe3+ ratio in nanomagnetite chemically produced from lepidocrocite and nanomagnetite biogenically produced by the Fe-reducing bacterium Shewanella putrefaciens. Together with TEM imaging, these measurements showed that the biotic magnetite nanoparticles were of excellent quality, with small size dispersion and high crystallinity. From the XMCD measurements, it could be shown that the biogenic nanomagnetite contained a higher amount of Fe2+ than the abiogenic nanomagnetit

Topics: Nanomagnetite, XMCD, Shewanella putrefaciens, biomineralization, [ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph]
Publisher: Mineralogical Society of America
Year: 2008
DOI identifier: 10.2138/am.2008.2713
OAI identifier: oai:HAL:hal-00643518v1
Provided by: Hal-Diderot
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