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Ion specificity of the zeta potential of α-alumina, and of the adsorption of p-hydroxybenzoate at the α-alumina-water interface

Das, Manash ; Borah, Jayanta ; Kunz, Werner ; Ninham, Barry W. ; Mahiuddin, Sekh


The influence of inorg. anions (NO-3, I-, Br-, Cl-, SO42-, and S2O32-) and divalent cations (Ca2+ and Mg2+) on the zeta potential and isoelec. point of α-alumina in aq. medium has been studied. The effect of the anions is highly ion specific even at salt concns. as low as 5 × 10-4 M. This unexpected finding is in line with a recent report. It is also in agreement with an earlier theor. ...


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