Dependence of the energy of surface active substances metal interaction on their ionization potentials. Evaluation of hydrophilicity of metal

The function Delta(Delta G(A)(0)), which is the difference of Gibbs energies characterizing surface-active substance (surfactant, SAS) adsorption at metal/solution and air:solution surfaces, has been introduced. The equation connecting the function Delta(Delta G(A)(0)) with SAS ionization potential has been obtained using the elementary theory of donor-acceptor interactions. Published experimental data on SAS adsorption at mercury, bismuth and gold have been used for Delta(Delta G(A)(0)) calculation. The dependence of Delta(Delta G(A)(0)) on ionization potentials can be described by an equation derived in this work. It has been demonstrated that the value of the hydrophilicity of gold is much higher than the values for mercury and bismuth. The lifetime of SAS molecules at a metal surface has been estimated. The question of the possibility of theoretical estimation of standard energies Delta G(A)(0) characterizing SAS adsorption at a metal solution surface has been discussed.