Interaction Between Two Similar Plane Parallel Double Layers for FeCl3 Type Asymmetric Electrolytes at Positive Surface Potential

Abstract

The interaction between two similar plane double-layers for FeCl3 type asymmetric electrolytes at positive surface potential were expanded in the power series at low and high potential, respectively. The high potential formula can be applied to 0.1 ≤ y e < y 0 ≤ 20. This almost covers with the bounds of all potential, and that the calculative method is relative simple. The accurate numeral results and V′ − ξ d curves were given for y 0 ≤ 20 and they can be used to check up the validity of approximate expressions obtained. When y 0 ≥ 10, all V′ − ξ d curves almost superpose. The interaction energy between two similar plane parallel double layers for symmetric and asymmetric electrolytes at y 0 = 1 were compared. The present results are also fit for Na3PO4 type asymmetric electrolytes at negative surface potential.