Observation of magnetic vortex configuration in non-stoichiometric FeO nanospheres.

Theoretical and micromagnetic simulation studies of magnetic nanospheres with vortex configurations suggest that such nanostructured materials have technological advantages over conventional nanosystems for applications based on high-power-rate absorption and subsequent emission. However, full experimental evidence of magnetic vortex configurations in spheres of submicrometer size is still lacking. Here, we report the microwave irradiation fabrication of FeO nanospheres and establish their magnetic vortex configuration based on experimental results, theoretical analysis, and micromagnetic simulations.

Significantly enhancement of sunlight photocatalytic performance of ZnO by doping with transition metal oxides.

In this study we report, the synthesis of ZnO and its doping with Transition Metal Oxides -TMO-, such as CrO, MnO, FeO, CoO, NiO, CuO and CuO. Various characterization techniques were employed to investigate the structural properties. The X-ray diffraction (XRD) data and Rietveld refinement confirmed the presence of TMO phases and that the ZnO structure was not affected by the doping with TMO which was corroborated using transmission Electron microscopy (TEM).

Magnetic nanohydrogel obtained by miniemulsion polymerization of poly(acrylic acid) grafted onto derivatized dextran.

This study describes the synthesis of magnetic nanohydrogels by miniemulsion polymerization technique. Dextran was derivatized by the glycidyl methacrylate to anchor vinyl groups on polysaccharides backbone, allowing its use as a macromonomer for miniemulsion polymerization, as confirmed by proton nuclear magnetic resonance spectroscopy (C NMR). Magnetite nanoparticles were synthesized by coprecipitation, followed by air oxidation to maghemite.