Hexagonal ferrites: A review of the synthesis, properties and applications of hexaferrite ceramics

Recovery and reuse of expensive catalysts after catalytic reactions are important factors for sustainable process management. The aim of this Review is to highlight the progress in the formation and catalytic applications of magnetic nanoparticles and magnetic nanocomposites. Directed functionalization of the surfaces of nanosized magnetic materials is an elegant way to bridge the gap between heterogeneous and homogeneous catalysis. The introduction of magnetic nanoparticles in a variety of solid matrices allows the combination of well-known procedures for catalyst heterogenization with techniques for magnetic separation.

Magnetically Separable Nanocatalysts: Bridges between Homogeneous and Heterogeneous Catalysis

Non‐Noble‐Metal‐Based Electrocatalysts toward the Oxygen Evolution Reaction

Magnetite and hematite are common minerals in a range of mineral deposit types. These minerals form partial to complete solid solutions with magnetite, chromite, and spinel series, and ulvospinel as a result of divalent, trivalent, and tetravalent cation substitutions. Electron microprobe analyses of minor and trace elements in magnetite and hematite from a range of mineral deposit types (iron oxide-copper-gold (IOCG), Kiruna apatite–magnetite, banded iron formation (BIF), porphyry Cu, Fe-Cu skarn, Fe-Ti, V, Cr, Ni-Cu-PGE, Cu-Zn-Pb volcanogenic massive sulfide (VMS) and Archean Au-Cu porphyry and Opemiska Cu veins) show compositional differences that can be related to deposit types, and are used to construct discriminant diagrams that separate different styles of mineralization. The Ni + Cr vs. Si + Mg diagram can be used to isolate Ni-Cu-PGE, and Cr deposits from other deposit types. Similarly, the Al/(Zn + Ca) vs. Cu/(Si + Ca) diagram can be used to separate Cu-Zn-Pb VMS deposits from other deposit types. Samples plotting outside the Ni-Cu-PGE and Cu-Zn-Pb VMS fields are discriminated using the Ni/(Cr + Mn) vs. Ti + V or Ca + Al + Mn vs. Ti + V diagrams that discriminate for IOCG, Kiruna, porphyry Cu, BIF, skarn, Fe-Ti, and V deposits.

Discriminant diagrams for iron oxide trace element fingerprinting of mineral deposit types

The roles of oxygen vacancies in electrocatalytic oxygen evolution reaction

A Facile Strategy to Construct Amorphous Spinel-Based Electrocatalysts with Massive Oxygen Vacancies Using Ionic Liquid Dopant

Synthesis, characterization and magnetic properties on nanocrystalline BaFe12O19 ferrite

Effect of Eu,Tb codoping on the luminescent properties of Y2O3 nanorods

Characterizations of microstructure and crystallographic orientation in a near-α titanium alloy billet

Nanocomposites of Fe−Co alloy and cobalt-substituted magnetite magnetic materials FexCo1−x/CoyRezFe3−y−zO4 (Re = none, La, Nd, and Gd) have been obtained successfully employing a surfactant-assisted solvothermal method. The nanocomposite features hard and soft magnetic phases juxtaposed within one discrete, anisotropic structure. Sodium oleate molecules were found effective in preventing the oxidation of the Fe−Co alloy and aggregation of the magnetic microspheres. X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy were used to characterize the structure and the morphology of the products. The result of magnetic characterization reveals that the magnetic microspheres exhibit a ferromagnetic behavior and possess high saturation magnetization and low coercivity. It is expected that these magnetic microspheres with uniform size would have potential applications such as magnetic carriers for drug targeting because of their exc...

Qin Wang

Papers

A Facile Strategy to Construct Amorphous Spinel-Based Electrocatalysts with Massive Oxygen Vacancies Using Ionic Liquid Dopant

Synthesis, characterization and magnetic properties on nanocrystalline BaFe12O19 ferrite

Effect of Eu,Tb codoping on the luminescent properties of Y2O3 nanorods

Characterizations of microstructure and crystallographic orientation in a near-α titanium alloy billet

Nanocomposites of Iron−Cobalt Alloy and Magnetite: Controllable Solvothermal Synthesis and Their Magnetic Properties