Synthesis and characterization of magnetite-maghemite nanoparticles in presence of polyethylene glycol obtained by mechanical milling

•Total conversión hematite-magnetite can be performed by soft and wet ball milling.•Ball milling in presence of PEG hepls to stabilize magnetite nanoparticles.•Ball milling in presence of PEG helps to reduce particle size distribution of MNPs. We present the synthesis and characterization ofmagnetit...

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Bibliographic Details
Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2021-01, Vol.263, p.114873, Article 114873
Main Authors: Velásquez, A.A., Urquijo, J.P.
Format: Article
Language:English
Subjects:
Agglomeration
Coercivity
Deionization
Diameters
Ferrimagnetism
Hematite
Hematite to nano magnetite-maghemite conversion
Magnetic saturation
Magnetite
Magnetization
Mechanical milling
Nanoparticles
Nanotechnology
Particle size distribution
Photomicrographs
Polyethylene glycol
Room temperature
Synthesis
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Summary:•Total conversión hematite-magnetite can be performed by soft and wet ball milling.•Ball milling in presence of PEG hepls to stabilize magnetite nanoparticles.•Ball milling in presence of PEG helps to reduce particle size distribution of MNPs. We present the synthesis and characterization ofmagnetite-maghemite nanoparticles obtained by mechanical milling of sub micrometric hematite in presence of polyethylene glycol (PEG) as stabilizing medium. Nanoparticles were obtained in a milling time of 24 h, being their aggregation and particle size distribution less than those obtained by us in a previous work employing a mixture of hematite and deionized water as precursor material.X-ray and room temperature Mössbauer measurements confirmed that milling products are composed only by thephases magnetite-maghemite. TEM micrographs showed quasi-spherical particles with low aggregation andmean diameteraround 14 nm. Room temperature magnetization loops are consistent withferrimagnetic multi domain nanoparticles, with saturation magnetization around 62 A m2 kg−1 and coercive field around 10.2 kA m−1. The results suggest that mechanical milling in presence of polyethylene glycol is a simple and efficient route to produce magnetite-maghemite nanoparticles with good magnetization, which can be useful for applications in nanotechnology.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2020.114873