Journal
JOURNAL OF THE ROYAL SOCIETY INTERFACE
Volume 10, Issue 83, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsif.2013.0134
Keywords
coercivity; anisotropy; hyperthermia; Geobacter; Fe(III) reduction; X-ray magnetic circular dichroism
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Funding
- NERC
- Office of Science, Office of Basic Energy Sciences, of the US Department of Energy [DE-AC02-05CH11231]
- Engineering and Physical Sciences Research Council [1131730, EP/E500579/1] Funding Source: researchfish
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Cobalt-doped magnetite (CoxFe3-xO4) nanoparticles have been produced through the microbial reduction of cobalt-iron oxyhydroxide by the bacterium Geobacter sulfurreducens. The materials produced, as measured by superconducting quantum interference device magnetometry, X-ray magnetic circular dichroism, Mossbauer spectroscopy, etc., show dramatic increases in coercivity with increasing cobalt content without a major decrease in overall saturation magnetization. Structural and magnetization analyses reveal a reduction in particle size to less than 4 nm at the highest Co content, combined with an increase in the effective anisotropy of the magnetic nanoparticles. The potential use of these biogenic nanoparticles in aqueous suspensions for magnetic hyperthermia applications is demonstrated. Further analysis of the distribution of cations within the ferrite spinel indicates that the cobalt is predominantly incorporated in octahedral coordination, achieved by the substitution of Fe2+ site with Co2+, with up to 17 per cent Co substituted into tetrahedral sites.
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