Controlled cobalt doping in biogenic magnetite nanoparticles

被引:63
作者
Byrne, J. M. [1 ,3 ]
Coker, V. S. [1 ]
Moise, S. [4 ]
Wincott, P. L. [1 ]
Vaughan, D. J. [1 ]
Tuna, F. [2 ]
Arenholz, E. [5 ]
van der Laan, G. [1 ,6 ]
Pattrick, R. A. D. [1 ]
Lloyd, J. R. [1 ]
Telling, N. D. [4 ]
机构
[1] Univ Manchester, Sch Earth Atmospher & Environm Sci, Williamson Res Ctr Mol Environm Sci, Manchester M13 9PL, Lancs, England
[2] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England
[3] Univ Tubingen, Ctr Appl Geosci, D-72076 Tubingen, Germany
[4] Keele Univ, Inst Sci & Technol Med, Stoke On Trent ST4 7QB, Staffs, England
[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
[6] Diamond Light Source, Didcot OX11 0DE, Oxon, England
关键词
coercivity; anisotropy; hyperthermia; Geobacter; Fe(III) reduction; X-ray magnetic circular dichroism; AMB-1 MAGNETOTACTIC BACTERIA; 2P ABSORPTION-SPECTRA; MINERALIZATION PATHWAYS; MOSSBAUER-SPECTROSCOPY; IRON; MAGNETOSOMES; REDUCTION; FERRIHYDRITE; HYPERTHERMIA; DICHROISM;
D O I
10.1098/rsif.2013.0134
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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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页数:12
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