Abstract

By means of neutron activation analysis of octadecylamine multilayers deposited from phosphate subsolutions at different pH and salt concentrations, the interaction of the monolayers with the phosphate anions is studied. It is found that between pH 4.5 and 9.5 it is mainly the divalent form HPO 4 2− which interacts with the octadecylammonium cations. The stability constant of the octadecylammonium hydrogenphosphate is estimated by applying the Scatchard-Hildebrand theory to evaluate the activity coefficients of the monolayer components.

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