Temperature dependence of the electrical double layer on oxides: Rutile and hematite

The surface charge σ 0 on aqueous suspensions of hematite and rutile was measured as a function of pH in various KNO 3 concentrations and at different temperatures. Two types of congruences were observed: (a) if σ 0 is plotted as a function of the pH minus the pzc, curves on these two oxides coincid...

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Bibliographic Details
Published in:Journal of colloid and interface science 1989, Vol.127 (1), p.116-131
Main Authors: Fokkink, L.G.J, de Keizer, A, Lyklema, J
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Laboratorium voor Fysische chemie en Kolloïdkunde
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physical Chemistry and Colloid Science
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Summary:The surface charge σ 0 on aqueous suspensions of hematite and rutile was measured as a function of pH in various KNO 3 concentrations and at different temperatures. Two types of congruences were observed: (a) if σ 0 is plotted as a function of the pH minus the pzc, curves on these two oxides coincide at the same KNO 3 concentrations and (b) the same is observed for σ 0 as a function of temperature. Thermodynamic analysis enabled us to separate double layer parameters into oxide-specific and generic contributions. Standard Gibbs energies, enthalpies, and entropies for proton adsorption were obtained.
ISSN:0021-9797
1095-7103
DOI:10.1016/0021-9797(89)90012-X