SURFACE STUDIES OF THE ENHANCED ADSORPTION OF SODIUM-IONS ONTO OXIDIZED SURFACES IN ACETONE-CONTAINING AQUEOUS-SOLUTIONS

The adsorption behavior of sodium ions onto oxidized surfaces was stud ied with x-ray photoelectron spectroscopy (XPS). We studied the adsorp tion of sodium ions onto oxidized surfaces by exposing the surfaces to aqueous neutral and acidic solutions of sodium ions with and without the presence of a high concentration of acetone. The oxidized surfaces chosen were carbon-fiber surfaces electrochemically oxidized in ammon ium carbonate solution, and oxidized aluminum and copper surfaces. No adsorption of sodium ions was found when the oxidized surfaces were ex posed to aqueous solutions of sodium ions with no acetone present, but substantial adsorption was seen when neutral aqueous solutions of sod ium ions were used with a high concentration of acetone present. Adsor bed sodium ions could not be removed by washing in acetone but could b e removed by washing in water, When glutaraldehyde was present in the acetone solutions there was evidence for the surface adsorption of glu taraldehyde/acetone condensation products.