Predicting and understanding the cation distribution in spinels has been one of the most interesting problems in materials science. The present work investigates the effect of cation redistribution on the structural, electrical, optical and magnetic properties of mixed-valent inverse spinel NiCo2O4(NCO) thin films. It is observed that the films grown at low temperatures (T < 400 °C) exhibit met...

The biosorption mechanisms of different heavy metallic cations (Cd, Ni, Pb) to active chemical groups on the cell wall matrix of the nonliving brown marine macroalga, Sargassum vulgaris in its natural form, were examined by the following instrumental and chemical techniques: Fourier-transform infrared (FTIR) analysis, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), a...

However, the co-existence of metallic and semiconducting tubes in as-synthesized SWNT samples has been a bottleneck for fundamental research and fabrication of electronic and optoelectronic devices. [ 6 ] It is desirable to develop effective purifi cation methods by which SWNT samples enriched in semiconducting species may be prepared. Various methods to sort semiconducting from metallic nanotu...