Analysis of biogenic magnetite nanoparticles
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PANGAEA
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2013
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| _version_ | 1867170028501073920 |
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| author | Byrne, James M Coker, V S Moise, S Wincott, P L Vaughan, D J Tuna, F Arenholz, E van der Laan, G Pattrick, R A D P Lloyd, J R Telling, N D |
| author_facet | Byrne, James M Coker, V S Moise, S Wincott, P L Vaughan, D J Tuna, F Arenholz, E van der Laan, G Pattrick, R A D P Lloyd, J R Telling, N D |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 SQUID, x-ray magnetic circular dichroism, Mössbauer 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 <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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_808948 |
| institution | PANGAEA |
| language | en |
| publishDate | 2013 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Analysis of biogenic magnetite nanoparticles Byrne, James M Coker, V S Moise, S Wincott, P L Vaughan, D J Tuna, F Arenholz, E van der Laan, G Pattrick, R A D P Lloyd, J R Telling, N D 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 SQUID, x-ray magnetic circular dichroism, Mössbauer 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 <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. |
| title | Analysis of biogenic magnetite nanoparticles |
| topic | |
| url | https://doi.org/10.1594/PANGAEA.808948 |