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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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Journal ArticleDOI
TL;DR: In this article, the impact of synthesis parameters on the co-precipitation process of superparamagnetic iron oxide nanoparticles was investigated and the results indicated that the saturation magnetization is directly related to the particle size.

128 citations

Journal ArticleDOI
TL;DR: In this article, a series of experiments has been carried out to investigate the possible formation of magnetite, Fe3O4, under ambient soil-forming conditions, which was achieved through controlled oxidation of Fe2+ solutions at room temperatures and near neutral pH values.
Abstract: A series of experiments has been carried out to investigate the possible formation of magnetite, Fe3O4, under ambient soil-forming conditions. Rapid and easy synthesis of magnetite was achieved through controlled oxidation of Fe2+ solutions at room temperatures and near neutral pH values. The synthetic products were found to range in size between 0·01–0·07 µm (mean diameter) and hence span the theoretical superparamagnetic-single-domain grain-size boundary.

128 citations

Journal ArticleDOI
TL;DR: In this article, an anion-assisted hydrothermal route for the production of magnetic iron oxide short nanotubes (SNTs) employing an an ion-assisted hydrogel route by simultaneously using phosphate and sulfate ions was proposed.
Abstract: We present a facile approach to the production of magnetic iron oxide short nanotubes (SNTs) employing an anion-assisted hydrothermal route by simultaneously using phosphate and sulfate ions. The size, morphology, shape, and surface architecture control of the iron oxide SNTs are achieved by simple adjustments of ferric ions concentration without any surfactant assistance. The result of a formation mechanism investigation reveals that the ferric ions concentrations, the amount of anion additive, and the reaction time make significant contributions to SNT growth. The shape of the SNTs is mainly regulated by the adsorption of phosphate ions on faces parallel to the long dimension of elongated α-Fe2O3 nanoparticles (c axis) during nanocrystal growth, and the hollow structure is given by the preferential dissolution along the c axis due to the strong coordination of the sulfate ions. Moreover, the as-synthesized hematite (α-Fe2O3) SNTs can be converted to magnetite (Fe3O4) and maghemite (γ-Fe2O3) ferromagneti...

127 citations

Journal ArticleDOI
TL;DR: In this article, the authors used soft X-ray core-level photoemission and adsorption spectroscopies to study the reaction of aqueous sodium chromate solutions (50μM Na 2 CrO 4, pH 6 and 8.5) with clean surfaces of magnetite (111) prepared under UHV conditions.

127 citations

Journal ArticleDOI
TL;DR: In this paper, a polystyrene core-shell colloidal microspheres with a selectable number of layers of magnetite (12 nm) and silica-coated gold (15 nm) nanoparticles was fabricated using the layer-by-layer (LbL) technique in aqueous solution.
Abstract: Multifunctional core-shell microspheres consisting of a polystyrene 640 nm diameter core covered with a selectable number of layers of magnetite (12 nm) and silica-coated gold (15 nm) nanoparticles have been fabricated using the layer-by-layer (LbL) technique in aqueous solution. By varying the shell thickness and layer composition the magnetic and optical properties and the diameter of the colloids can be controlled independently. Optical spectra of the core-shell colloidal microspheres show a well-resolved Au surface plasmon peak in the visible which red-shifts with the number of adsorbed Au nanoparticle layers. The magnetic moment per sphere increases nearly linearly with the number of adsorbed magnetite nanoparticle layers, and the spheres can be assembled into chains of up to 1 mm length by deposition in a magnetic field.

127 citations


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