The effect of crystal structure on the surface properties of a series of manganese dioxides

摘要: Abstract The zero-points-of-charge for a series of manganese dioxides have been determined by both electrophoretic and coagulation-sedimentation techniques. zpc was found to increase from pH 1.5 the amorphous δ form MnO 2 up 7.3 β-MnO , most well-defined crystalline form. This variation is interpreted in terms of, shown be agreement with, electrostatic field strength concept modified describe more complex solids. change cation-anion spacing, as derived volume per unit cell cation crystal lattice, corresponds polarization water dipoles their subsequent dissociation establish electrochemical double layer at oxide-water interface.