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Journal of Nanoparticle Research

Erschienen in:

01.01.2011 | Research Paper

Magnetite hollow spheres: solution synthesis, phase formation and magnetic property

verfasst von: Qian Sun, Zheng Ren, Rongming Wang, Weimeng Chen, Chinping Chen

Erschienen in: Journal of Nanoparticle Research | Ausgabe 1/2011

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Abstract

Polycrystalline magnetite hollow spheres with diameter of about 200 nm and shell thickness of 30–60 nm were prepared via a facile solution route. For the reaction, ethylene glycol (EG) served as the reducing agent and soldium acetate played the role of precipitator. In addition, polyvinylpyrrolidone (PVP) served as a surface stabilizer. The morphologies and structures were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The intermediate products at different stages were also studied to shed light on the evolution of phase formation. It revealed that the hollow structure formed via self-assembly of nanocrystallites (about 15 nm) using sodium acetate as mild precipitator. Evidences further pointed out that the Ostwald ripening process well explained the growth mechanism of the hollow structure. Magnetization measurements showed that the coercivity of magnetite hollow spheres at low temperature is about 200 Oe and the saturation magnetization is about 83 emu g⁻¹, roughly 85% that of the bulk phase, close to the value of its solid counterpart. In addition, a freezing transition was observed at 25 K.

Vorheriger Artikel Systematic evaluation of biocompatibility of magnetic Fe3O4 nanoparticles with six different mammalian cell lines

Nächster Artikel Structural investigations of Ge nanoparticles embedded in an amorphous SiO2 matrix

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Titel: Magnetite hollow spheres: solution synthesis, phase formation and magnetic property
verfasst von: Qian Sun
Zheng Ren
Rongming Wang
Weimeng Chen
Chinping Chen
Publikationsdatum: 01.01.2011
Verlag: Springer Netherlands
Erschienen in: Journal of Nanoparticle Research / Ausgabe 1/2011
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-010-0020-5

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