Potential energy in the electrical double layer and slipping plane potential

In previous research, the authors have produced and analysed a model of an electrical double layer, demonstrating the positiveness of the zeta potential arising when aluminium particles are introduced into distilled water. Further, they were able to demonstrate that an increase in conductivity led to the appearance of a negative zeta potential. The same type of phenomenon can also be found when the electrostatic potential energies are sought by applying the Poisson-Boltzmann equation. The present paper provides an additional comparison of these two double layer models obtained from experimental measurements and from calculation respectively. From the comparison, a value of 5.3x10(-11) m(2)/s is deduced for the coefficient of molecular diffusion. This is close to the value of 7.35x10(-11) m(2)/s given by the Chemical Handbook for polyethylene oxide.