There is a growing need for production of iron particles due to their possible use in numerous systems (e.g., electrical, magnetic, catalytic, biological and others). Although severe reaction conditions heavy solvents are frequently used nanoparticles, green synthesis has arisen as an eco-friendly method that uses catalysts. Various precursors combined with material (such enzymes, herbal extrac...

The paper considers the possibility of superconductivity setting in when the distance aB between molecules (atoms) is such that aF < aB < aW , where aF and aW are the equilibrium separations in Fermi metals and van der Waals insulators. The last has no band sructure. This is the binding energy region 40–60 kJ/mol. However, neither stretch of metals (”dilution” by insulators) nor compression of ...

12-Tungstophosphoric acid supported on silica-coated magnetic nano particles was prepared and characterized by transmission electron microscopy, scanning electron microscopy, powder X-ray diffraction and inductively coupled plasma atomic emission spectroscopy. Acidity of the catalysts was measured by potentiometric titration with n-butylamine. Catalytic activity of the prepared sample was evalu...

The electrical transport properties of single-wall carbon nanotubes are shown to be strongly influenced by the presence of transition-metal impurities derived from the catalyst introduced to stimulate their growth. Data on thermoelectric power and electrical resistance in the temperature range 10–400 K were obtained on a series of samples prepared using M -Y catalysts ~M5Cr, Mn, Co, Fe, Ni!. Th...

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Iron oxide microtubules produced by a species of iron-oxidizing bacteria, Leptothrix ochracea, have been expected to be useed as unique multifunctional materials such as catalysts scaffolds, pigments, and magnetic materials. However, their structural characteristics and formation mechanism are still ambiguous. The detailed features of the microtubules were characterized through electron microsc...

The scientific community is in strong agreement that nanoscale materials, which are less than 100-billionths of a meter in size, exhibit superior chemical, mechanical, electronic, magnetic, and optical properties. When this project was funded in 1992, it was believed that this technology could increase U.S. market share in the diesel engine and ball-bearing industries. At that time, however, th...

Mesoporous and conventional Fe-containing ZSM-5 catalysts (0.5–8 wt% Fe) were prepared using a simple impregnation method and tested in NO selective catalytic reduction (SCR) with NH3. It was found that mesoporous Fe-ZSM-5 catalysts exhibit higher SCR activities than comparable conventional catalysts. Furthermore, conventional Fe-ZSM-5 catalysts have maximum activity at ~ 2.5 wt% Fe while for t...