ADSORPTION OF CTAB FROM AQUEOUS-SOLUTIONS ON FUSED QUARTZ

Analysis of experimental data on surface potentials and charges of qua rtz capillaries in aqueous solutions of cationic surfactant (CTAB) at various pH values of the background solution was made on the basis of previously obtained derivations. Experimental data obtained was shown to be in good agreement with the model of the Langmuir adsorption on t wo types of active sites, i.e., charged and uncharged. Adsorption pote ntials on these sites, Phi(1) and Phi(2), equal to -15 kT and -11 kT, respectively, were determined. Calculated results based on monolayer a nd two-layer models of adsorption were virtually identical, thus makin g preference of one of these mechanisms impossible.