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American Mineralogist; May 2008; v. 93; no. 5-6; p. 880-885; DOI: 10.2138/am.2008.2713
© 2008 Mineralogical Society of America
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Biogenic vs. abiogenic magnetite nanoparticles: A XMCD study

Claire Carvallo1,*, Philippe Sainctavit1, Marie-Anne Arrio1, Nicolas Menguy1, Yuheng Wang1, Georges Ona-Nguema1 and Sandrine Brice-Profeta1,2

1 Institut de Minéralogie et de Physique des Milieux Condensés, Campus Boucicaut, 140 rue de Lourmel, 75015 Paris, France
2 ENSEEG/LTPCM, Domaine Universitaire 1130 rue de la piscine, BP 7538402 Saint-Martin d’Hères Cedex, France

Correspondence: * E-mail: claire.carvallo{at}impmc.jussieu.fr

X-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 nanomagnetite.

Key Words: Nanomagnetite • XMCD • Shewanella putrefaciens • biomineralization






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