Adsorption of N-decanoyl-N-methylglucamine at the Interface Electrode-NaClO4 Solution. Comparison of Adsorption Properties of Different Surfactants

The electrosorption behaviour of non-ionic surfactant: N-decanoyl-N-methylglucamine on mercury electrode in 1 mol dm(-3) NaClO4 solution was determined. The values of the relative surface excess were determined on the basis of double layer differential capacity. A set of parameters of maximal adsorption and the constants of Frumkin, modified Flory-Huggins and virial adsorption isotherms were obtained. It was stated that the adsorption of this surfactant is determined by the adsorption energy, however here is no simple relation between a surface excess and the values of repulsive interactions parameter A. Adsorption properties of three surfactants: cationic, anionic and non-ionic were compared.