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Electrochemical impedance spectroscopy was used to measure the charge transfer resistance of the reaction: Fe3+ + e- = Fe2+ and electrical double layer capacitance on pyrite electrodes of different origin both freshly polished and conditioned in the solutions of several surface active substances which may be used as potential inhibitors of the oxidation of pyrite. The following substances were used...
The initial steps of the oxidation of galena (PbS) surface with special attention to the oxidation in an aqueous environment were investigated by the X-ray photoelectron spectroscopy method (XPS). Galena monocrystals from two different sources were cleaved and exposed to either air or an aqueous environment. The results show that the presence of organic contamination at the galena surface may exert...
Vanadia monolayers deposited on various oxide supports (Zr02, Nb(2)O(5), TiO2, Al(2)O(3) and Si0(2) have been investigated with the aid of electron spin resonance. The results show that the electronic structure of reduced vanadyl species generated during methanol chemisorption depends on the nature of the supporting matrix. This is shown by changes of theBeta(2) bonding coefficient calculated from...
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