Journal ArticleDOI
As-Prepared Single-Crystalline Hematite Rhombohedra and Subsequent Conversion into Monodisperse Aggregates of Magnetic Nanocomposites of Iron and Magnetite
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TLDR
Monodisperse nanocrystalline rhombohedral composites of Fe and Fe3O4 magnetic materials have been obtained employing a reduction reaction, in a flowing gas mixture of H2 and N2, of single-crystalline, submicron-sized α-Fe2O3 rhombohedra precursors as mentioned in this paper.Abstract:
Monodisperse nanocrystalline rhombohedral composites of Fe and Fe3O4 magnetic materials have been obtained employing a reduction reaction, in a flowing gas mixture of H2 and N2, of single-crystalline, submicron-sized α-Fe2O3 rhombohedral precursors This synthesis is significant in that we were able to create a nanocomposite with hard and soft magnetic phases juxtaposed within one discrete, anisotropic structure In turn, the precursor hematite rhombohedra of reproducible shape were successfully prepared using a facile, environmentally friendly, large-scale molten-salt reaction Rhombohedra represent a high-surface-area, anisotropic formulation of an industrially important material (iron oxide), which is an active component of gas sensors, photocatalysts, and other types of catalytic materials Moreover, the predictive formation of these materials has been investigated through a systematic variation of experimental parameters Extensive structural characterization of as-prepared samples has been performedread more
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Salt melt synthesis of ceramics, semiconductors and carbon nanostructures
TL;DR: The recent progress in SMS of inorganic materials, including oxide ceramic powders, semiconductors and carbon nanostructures, is reviewed here and special emphasis is placed on materials with nanostructure generated by SMS, and the possible modulation of materials structures at the nanoscale in the salt melt.
Journal ArticleDOI
Environmentally Friendly Methodologies of Nanostructure Synthesis
TL;DR: Advances in the use of the molten-salt synthetic methods, hydrothermal protocols, and template-directed techniques are described as environmentally sound, socially responsible, and cost-effective methodologies that allow us to generate nanomaterials without the need to sacrifice sample quality, purity, and crystallinity.
Journal ArticleDOI
Hierarchically Nanostructured α-Fe2O3 Hollow Spheres : Preparation, Growth Mechanism, Photocatalytic Property, and Application in Water Treatment
Shao-Wen Cao and,Ying-Jie Zhu +1 more
TL;DR: In this article, α-Fe2O3 hierarchically nanostructured hollow spheres assembled by nanosheets were prepared by thermal decomposition of a precursor which was obtained using FeCl3·6H2O, NaOH, and sodium dodecylbenzenesulfonate in the solvent ethylene glycol by a facile microwave-assisted solvothermal method.
Journal ArticleDOI
Preferential and Enhanced Adsorption of Different Dyes on Iron Oxide Nanoparticles: A Comparative Study
TL;DR: In this article, the authors report a preferable and enhanced adsorption phenomena of the dyes containing hydroxyl (−OH) groups on iron oxide nanoparticles, which can be separated by an external magnetic field and have an average size of 20−40 nm with a surface area of ∼70 m2 g−1.
Journal ArticleDOI
Controlled synthesis and gas-sensing properties of hollow sea urchin-like α-Fe2O3 nanostructures and α-Fe2O3 nanocubes
TL;DR: In this article, a hollow sea urchin-like α-Fe 2 O 3 nanostructures were successfully synthesized by a hydrothermal approach using FeCl 3 and Na 2 SO 4 as raw materials, and subsequent annealing in air at 600 °C for 2Âh.
References
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Journal ArticleDOI
Microhardness anisotropy and the indentation size effect on the basal plane of single crystal hematite
TL;DR: The Knoop microhardness anisotropy of single crystal hematite, Fe 2 O 3, was investigated on the basal plane (0001) at indentation test loads from 50 to 1000 g as mentioned in this paper.
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Iron–iron oxide composite thin films prepared by chemical vapor deposition from iron pentacarbonyl
TL;DR: In this article, the effect of carbon dioxide mole fraction on the structure of the composite thin film was discussed and the magnetic properties were obtained from the hysteresis curve of in-plane magnetization.
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Synthesis and characterization of L10 FePt nanoparticles from Pt(Au, Ag)/ γ-Fe2O3 core-shell nanoparticles
Vassilios Tzitzios,Dimitrios Niarchos,George C. Hadjipanayis,Eamonn Devlin,Dimitrios Petridis +4 more
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Synthesis and Characterization of Single Crystal α-Fe2O3 Nanobelts
TL;DR: In this paper, single crystal nanobelts of hematite (α-Fe2O3) with narrow width distribution centered at 230 nm and length up to several microns have been prepared in NaCl flux using a simple solid-state reaction.
Journal ArticleDOI
Properties of nanocomposites of α-Fe and Fe3O4
P. Brahma,Sourish Banerjee,Debabrata Das,P. K. Mukhopadhyay,Sandip Chatterjee,A. K. Nigam,Dipankar Chakravorty +6 more
TL;DR: In this article, a reduction treatment in hydrogen at a temperature of 683 K for a duration from 5 to 40 min is described, where the incorporation of hydrogen atoms during the reduction process appears to break down the precursor oxide particles.