Abstract:
Interaction pressures between approaching identical semi-infinite plates are examined for Agl in
aqueous solution in the cases of constant Ag+/I~ charge, constant total charge, constant wall potential
0o and constant diffuse layer potential 0d. For this purpose the adsorption isotherm for K+ ions on
silver iodide is taken from a combination of potentiometric titration and electrokinetic data. The
physically unrealistic result of repulsive pressures tending to infinite values at short separations, which
occurs for constant total charge, is shown not to occur for constant surface charge when the adsorbed
charge due to indifferent counter ions can equilibrate on approach.
