Reversible Charging of the Ice–Water Interface: I. Measurement of the Surface Potential

doi:10.1006/jcis.2000.7193

Journal of Colloid and Interface Science

Volume 232, Issue 1, 1 December 2000, Pages 81-85

https://doi.org/10.1006/jcis.2000.7193 Get rights and content

Abstract

An ice electrode was constructed in order to measure dependency of the surface potential on pH. The electrode had a Plexiglas body with a platinum plate on the bottom, which was cooled by passing the cooling liquid through a tube mounted inside the electrode. The temperature inside the electrode was −7°C, while the electrolyte solution was kept at 0.02°C, so that an ice layer was formed on the platinum plate. In the acidic region fast equilibration of electrode was observed. The slope dφ₀/dpH was found to be between −40 and −46 mV. The maximum of the slope was observed at pH 4.4, which coincides with the isoelectric point of ice–water interface. In the basic region the equilibration was slow and more pronounced deviation from the Nernstian behavior was observed. The results were explained on the basis of the surface complexation model, assuming an amphotheric nature of surface OH groups. In the basic region the surface bears high negative charge so that binding of sodium ions at the interface influenced the results.

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Regular ArticleReversible Charging of the Ice–Water Interface: I. Measurement of the Surface Potential

Abstract

J. Electroanal. Chem.

J. Colloid Interface Sci.

J. Colloid Interface Sci.

Adv. Colloid Interface Sci.

J. Colloid Interface Sci.

J. Colloid Interface Sci.

J. Colloid Interface Sci.

Colloids Surf.

Colloids Surf.

J. Electroanal. Chem.

Electrochim. Acta

Adv. Colloid Interface Sci.

J. Colloid Interface Sci.

Surf. Sci.

Colloids Surf.

Phys. Rev.

Regular Article
Reversible Charging of the Ice–Water Interface: I. Measurement of the Surface Potential