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Magnetite

About: Magnetite is a research topic. Over the lifetime, 10277 publications have been published within this topic receiving 278071 citations.


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TL;DR: In this paper, a single reaction sonochemical method using inexpensive and non-toxic metal salt (FeSO4·7H2O) as reactant was used to synthesize magnetite nanocubes with uniform particle size of about 80nm.
Abstract: Monodisperse magnetite nanocubes with uniform particle size of about 80 nm have been synthesized in aqueous medium by single reaction sonochemical method using inexpensive and non-toxic metal salt (FeSO4·7H2O) as reactant. The crystallinity of the magnetite nanocube is enhanced by annealing treatment up to 600 °C with uniform shape and size distribution, after that a distortion in shape and a broad size distribution are obtained at 700 °C annealing temperature. The magnetic characterization of the nanoparticles reveals saturation magnetization of 91 emu/g at 5 K for as-synthesized sample and 94.8 emu/g for the sample which annealed at the temperature of 600 °C in a vacuum chamber. However, the saturation magnetization has been observed to decrease with further increase in annealing temperature and this has been attributed to the presence of a thin magnetic dead layer at the surface caused by shape anisotropy distortion and broken exchange bonds, and spin canting on the surface of the particles in addition to the formation of a small amount of maghemite phase.

78 citations

Journal ArticleDOI
TL;DR: In this article, the speciation of chromium in overlayers on atomically clean surfaces of single crystal magnetite (Fe 3 O 4 ) and hematite (α-Fe 2 O 3 ) were studied using Cr L-edge, Fe Ledge, and O K-edge X-ray absorption spectra collected with synchrotron radiation.

78 citations

Journal ArticleDOI
TL;DR: In this article, superparamagnetic magnetite nanoparticles were synthesized induced by chitosan hydrogel under ambient conditions via iron ions assembly, and the inducing effect of chitosa hydrogels was discussed.
Abstract: Superparamagnetic magnetite nanoparticles were synthesized induced by chitosan hydrogel under ambient conditions via iron ions assembly, and the inducing effect of chitosan hydrogel was discussed. Results of X-ray diffraction and transmission electron microscopy indicate that the nanoparticles were inverse cubic spinel structure magnetite with diameter about 16 nm, and the superparamagnetic nanoparticles with narrow size distribution dispersed uniformly in chitosan. The magnetization measurements indicated that the nanoparticles showed the typical superparamagnetic behavior. The crystallinity, morphology, and magnetic properties of magnetite nanoparticles were remarkably influenced by the pH values of iron ion solutions. The interaction between magnetite and chitosan was illustrated by FT-IR and thermogravimetric analysis, which concluded that the magnetite nanoparticles were coated by a chitosan layer via the amino groups of chitosan. The chitosan hydrogel assisted in the synthesis of superparamagnetic magnetite nanoparticles through chelation by amino groups. Copyright © 2008 John Wiley & Sons, Ltd.

78 citations

Journal ArticleDOI
TL;DR: In this paper, the fabrication of highly crystalline magnetite particles with a uniform morphology and a relatively uniform average size of 54 nm was described, which were fabricated by oxidation of Fe(OH)2 by nitrate in basic aqueous media.
Abstract: We report the fabrication of highly crystalline magnetite particles with a uniform morphology and a relatively uniform average size of 54 nm. Particles were fabricated by oxidation of Fe(OH)2 by nitrate in basic aqueous media. Characterization of the particles by means of transmission electron microscopy, Raman spectroscopy, X-ray and electron diffraction, and magnetometry showed that they were octahedral magnetic monodomains of highly stoichiometric magnetite (unit formula was estimated to be Fe2.985O4), with room-temperature ferrimagnetic behavior and a saturation magnetization of 81.6 emu/g.

78 citations

Journal ArticleDOI
TL;DR: This new method increased the production rate and magnetic properties of the product, while improving crystallinity, size control and scalability, and was especially advantageous in the case of toxic metals such as Cr and Ni.

78 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023570
20221,277
2021367
2020478
2019494
2018446