Identical Particles Verwey-Overbeek Results

The classic treatment for identical surfaces involves, as in most treatments of particle-particle interaction, a symmetric z+ = z. = z) electrolyte, where the PB equation reduces to 

It should be noted in these equations, and in those of Section 6.4.1.1, that always the exponential decay of the form is predicted. 

FIGURE 6.7 Schematic view of the potential profile evolution (a) and resulting interaction force (b) for two identical plane double layers. (Adapted from Adv. Colloid Interface Sci., 42, Kihira, H., E. Matijevic, An assessment of heterocoagulation theories, 1-31. Copyright 1992, with permission from Elsevier.) 

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