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Abstract

The kinetic/adsorption properties of polyethylene glycol (PEG) on an alumina surface were examined. The influence of the molecular weight of PEG and of changes in the pH of the solution on the electrical properties at the solid/polymer solution interface were considered. The data obtained allowed the main factors responsible for the observed zeta potential and the surface charge changes on the A1₂O₃ surface to be determined. The calculated differences in the values of the surface charge (Δσ_d) and in the charge on the diffuse layer (Δσ_d) for the A1₂O₃/NaCl and A1₂O₃/PEG-NaCl systems enabled a mechanism to be proposed for the zeta potential changes. It was confirmed that the molecular weight of the polymer has an influence on the calculated thickness of the PEG adsorption layer on the alumina surface and thus on the conformation of the polymer chain in the near-surface region. The pH of the solution also affects the thickness of the adsorbed layers on the A1₂O₃ surface by influencing the interaction between the surface groups of the oxide and the conformational structures of the adsorbed macromolecule at the alumina/polymer solution interface.

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Influence of the Adsorption of Polyethylene Glycol at the A1 2 O 3 Surface on the Electrochemical Properties of the Al 2 O 3 /Solution Interface †

Abstract

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