Electrochemical study of manganese and iron compounds at carbon paste electrodes with electrolytic binder. Application to the characterization of manganese ferrite

Bactericidal Core-Shell Paramagnetic Nanoparticles Functionalized with Poly(hexamethylene biguanide)

“…The anodic peaks at approximately þ0.6, þ0.8, and þ1.2 V in the first cycle of voltammograms of the PHMBG-PEI-M particles correspond to the oxidation of Fe(II) species: 23 Fe 2þ f Fe 3þ þ e. The cathodic peaks at 0.15-0.25 V correspond to the Fe(III) reduction: Fe 3þ þ e f Fe 2þ . Anodic peaks in the -1 to -0.5 V area are of specific interest, as they describe the reductive dissolution behavior of the iron oxides: [24][25][26] Fe…”

Mapping of corrosion products of highly altered archeological iron using voltammetry of microparticles

“…Consistently with this modeling and literature data for iron oxides and hydroxioxides [42][43][44][45], linear variations of peak potentials, E p , with the logarithm of square wave frequency, logf, were obtained. In most cases, such as jarosite and ochres (see Fig.…”

“…Crystalline Fe(III) compounds display in general broad peaks corresponding to their reductive dissolution generating Fe 2+ ions in solution The voltammetric profile, however, is dependent on the crystallinity and hydration degree of the minerals, so that the position and shape (roughly, peak width) of the voltammetric peaks depend on the average particle size and the homogeneity of the particle size distribution [38,39,[42][43][44][45]. Thus, the wider peaks indicated less consolidated, and hence probably, more heterogeneous iron oxides [50].…”

“…Such processes can theoretically be described on the basis of the model developed by Grygar [42][43][44][45]50] where the reaction rate is driven by the detachment, via ion diffusion or complexation reaction of metal centers from the metal sites in the surface of the solid particles.…”

“…These are based on the use of conventional and graphite pencil [36,37] plus 'one-touch' [6] sampling strategies. The electrochemistry of several of the most frequent corrosion products of iron, namely, hematite, goethite, magnetite and siderite, has been studied in the context of mineral [38][39][40][41][42][43][44][45][46][47][48] and pigment [49][50][51] analyses. To the best of our knowledge, however, other corrosion products, namely, akaganeite and jarosite have not been previously studied.…”