Electrical Double Layer Interaction and DLVO Theory

Electrical Double Layer Interaction and DLVO Theory 

It is well known that Verwey and Overbeek and Derjaguin and Landau (DLVO) have given a quantitative treatment of the interaction of electrical double layers. According to them, the free energy of a double layer may be expressed as a difference between the surface energy G, of the system in its equilibrium state and the surface free energy G of a standard state in which no double layer is present  

Although this expression presents the basis of the free energy of the double layer, it is not truly expressive of the parameters that must be considered. According to Verwey and Overbeek and Ikeda, the free energy of a system of reversible double layers is determined by the following  

Verwey and Overbeek formulated a second expression for the free energy of the double layer based on the Gouy-Chapman model. 

This expression may be reduced using the Poisson equation a detailed analysis may be found in Devereux and de Bruyn.  

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