The depletion of fossil fuel reserves with increased demand and global emissions has the search for eco-friendly renewable fuels a low environmental impact. Biodiesel can be considered as mono-alkyl esters long-chain fatty acids obtained from transesterification vegetable oils animal fats. Economically low-cost biodiesel production received considerable interest blending fossil-based diesel mor...

The reversible transformations of thin magnetite (Fe3O4) and hematite (αFe2O3) films grown on Pt(111) and Ag(111) single crystals as support have been investigated by a combined low energy electron microscopy (LEEM) and low-energy electron diffraction (LEED) study. The conversions were driven by oxidation, annealing in ultrahigh vacuum (UHV), or Fe deposition with subsequent annealing. As expec...

The changes of the phase composition of iron oxide samples prepared by solgel method using single precursor both for nanoparticles and the matrix were studied by x-ray diffraction. Obtained data were analyzed by an approach using the Debye formula which is suitable for the size of particles up to about 10 nm. The phase composition of the nanoparticles was described by a core-shell model corresp...

One-dimensional metal oxide nanomaterials have attracted much attention due to their semiconducting behavior and applications in nanodevices such as gas sensors, photoACHTUNGTRENNUNGdiodes, field-effect transistors (FETs), and light-emitting diodes. The control of electrons and holes, that is, nor ptype nature, inside the functional metal oxide is of vital importance in the application of nanod...

Transition metal oxides have a high initial charge-discharge capacity of 800–1000 mAh/g, the electrochemical performance, cyclic performance and rate composite transition oxide graphene been improved due to unique two-dimensional structure excellent electrical conductivity graphene. In this paper, iron materials with different morphs were prepared by hydrothermal reaction temperatures, rGO/Fe2O...

A potters clay from the Gorgan plain, in N. E. Iran, has been fired successively at temperatures up to the melting point 1 200 "C in an atmosphere of air or 5 % CO in moist COz. Mossbauer spectra at 296 K and 4.2 K allow the determination of the relative amounts of iron in well-crystallised haematite or magnetite, of poorly-crystallised and fine-particle ferric oxide or hydroxide, and of iron d...