Abstract
The interaction between two similar plane double-layers for Al2(SO4)3 type asymmetric electrolytes was investigated with the aid of λ parameter method. The interaction energies for the system at positive surface potential were expanded in the power series at low and high potential, respectively. The high potential formula can be applied to 0.2 ≤ ye < 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′−ξd curves were given for y 0 ≤ 20. When y 0 ≥ 5, V′ hardly change with y 0. The interaction energies between two similar plane parallel double layers for the different type electrolytes at y 0 = 1 were compared. The present results are also fit for Mg3(PO4)2 type electrolytes at negative surface potential.