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In this contribution, we report a general method for the synthesis of 3D graphene/Fe3O4 NPs aerogels (GA-Fe3O4-EDA) with high porosity and Fe3O4 nanoparticles (NPs) are stably loaded on a graphene substrate, representing several-fold improvements compared to the chemical method in the literature. Graphene/Fe3O4 NPs aerogels with a continuous network are fabricated via γ-ray irradiation method induced reduction of Graphene oxide/Fe3O4 in EDA/H2O mixed solution. There is no doubt that they possess stronger magnetism with the increase of Fe3O4 content. According to the above characteristics of GA-Fe3O4-EDA, the composites can be used for aqueous-organic phase separation and adsorption of magnetic substances. This work paves the way for aqueous phase purification and magnetic material adsorption. [ABSTRACT FROM AUTHOR]

A CO oxidation catalyst that includes Pt clusters applied on nanosized TiN supports with a particle size of 18 and 36 nm has been synthesized. The catalyst has been studied using TEM, X-ray powder diffraction, and XPS methods. It has been found that platinum clusters formed on the support surface are covered with a mixture of platinum and platinum oxide. The coherent scattering range of the Pt cluster is close to 8 nm on a support with titanium nitride particles of 18 nm. The catalytic properties in the reaction of CO oxidation at 295 K and low CO concentrations (<100 mg/m3) have been examined. It has been found that when the platinum content in the catalyst is 9 to 15 wt %, the CO oxidation rate is 120 times higher than that on platinum black with a specific surface area of 30 m2/g. The catalysts are promising for use in catalytic systems for air purification. [ABSTRACT FROM AUTHOR]

On the basis of the universal Kennard-Stepanov-van Roosbroeck-Shockley relation, a general approach is proposed for separation of the contributions of homogeneous and inhomogeneous broadenings in the absorption and luminescence spectra of colloidal quantum dots. The applicability of the developed method is demonstrated on published experimental data. [ABSTRACT FROM AUTHOR]