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Resumen: A three-step aqueous approach to obtain large (>50 nm) magnetite single-core particles has been developed. The steps are a) synthesis of antiferromagnetic nanoparticles, b) particle coating and c) subsequent reduction of the core material to magnetite. By variation of precursor material and process conditions, the synthesis yielded rhombohedra, discs or needles below 200 nm. A combination of X-ray diffraction, 57Fe Mössbauer spectroscopy and infrared spectroscopy confirmed magnetite to be the dominant final core material. From transmission electron microscopy, we identified porous structures after the reduction. Magnetic characterization of the different magnetic nanopaticles revealed strikingly different magnetic behaviour depending on their shape, internal structure and reduction process. We conclude that each of these parameters have to be considered in further characterization of large magnetite nanoparticles.
Idioma: Inglés
DOI: 10.1016/j.actamat.2016.12.016
Año: 2017
Publicado en: ACTA MATERIALIA 125 (2017), 416-424
ISSN: 1359-6454
Factor impacto JCR: 6.036 (2017)
Categ. JCR: METALLURGY & METALLURGICAL ENGINEERING rank: 1 / 75 = 0.013 (2017) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 40 / 285 = 0.14 (2017) - Q1 - T1
Factor impacto SCIMAGO: 3.263 - Ceramics and Composites (Q1) - Polymers and Plastics (Q1) - Metals and Alloys (Q1) - Electronic, Optical and Magnetic Materials (Q1)

Financiación: info:eu-repo/grantAgreement/EUR/COST/TD1402
Financiación: info:eu-repo/grantAgreement/EC/FP7/604448/EU/Nanometrology Standardization Methods for Magnetic Nanoparticles/NANOMAG
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2014-52069-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/RYC-2014-15512
Tipo y forma: Article (PostPrint)
Área (Departamento): Área Química Analítica (Dpto. Química Analítica)

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