Carbon nanotubes – characterized for the first time in 1991 by Iijima [1] – have attracted much attention in terms of both fundamental science and technology because of their unique electrical, mechanical, and chemical proprieties [2]. Since the use of these nanoscale systems, pristine or functionalized, can collaborate to the development of new materials, where in interactions with biological ...

In this study, a series of manganese [Mn]-doped zinc oxide [ZnO] hierarchical microspheres [HMSs] are prepared by hydrothermal method only using zinc acetate and manganese acetate as precursors and ethylene glycol as solvent. X-ray diffraction indicates that all of the as-obtained samples including the highest Mn (7 mol%) in the crystal lattice of ZnO have a pure phase (hexagonal wurtzite struc...

Cu/ZnO/A1203 catalysts modified by compounds of manganese or cerium were prepared by coprecipitation or by impregnation and were tested for the synthesis of alcohol mixtures from synthesis gas at pressures of up to 70 bar. They were also examined by XPS both before and after the reaction. With both the impregnated and the coprecipitated catalysts, manganese increased the selectivity to higher a...

The frequencies of microwave absorption can be affected by the permanent electric dipole moment which could be adjusted by modifying the crystal symmetry of the microwave absorbing materials. Herein, we corroborate this strategy experimentally and computationally to the microwave absorption of manganese dioxides. Nanosized Co-doped cryptomelane (Co-Cryp) was successfully synthesized by a one-st...

Pure silicon-carbon films and the doped with manganese or nickel were deposited on a copper foil by electrochemical method from methanol / hexamethyldisilazane solution. Scanning electron microscopy studies of showed complex structure due to presence three-dimensional agglomerates “leafy” structures. Raman spectroscopy that highly defective. The porosity study revealed all samples mostly contai...

The Mn ion is a promising activator ion for tunable and short-pulse laser materials because of its broadband luminescence in the spectral region 850-1600 nm and its simple 3d electronic configuration, which excludes an occurrence of undesirable exited-state absorption into higher 3d levels. However, hexavalent manganese can be stabilized only in the tetrahedral oxo-coordination and easily reduc...