Nondispersive interactions

By analogy with the work of Fowkes, Owens and Wendt [44] and then Kaelble and Uy [45] have suggested that the nondispersive part of interactions between materials can be expressed as the geometric mean of the nondispersive components of their surface energy, although there is no theoretical reason to represent all the nondispersive interactions by this type of expression. Hence the work of adhesion W12 becomes... 

Statistical mechanical methods like GCMC or DFT have a good prospect in characterizing the PSD of activated carbon and in examining multicomponent adsorption equilibria at the microscopic level. However, the study of nonideal adsorption behavior with these methods is not a trivial task. The nondispersive interaction in the adsorption process also needs to be quantified. 

Nondispersive interaction free energy between solid and water mj - 30.7 0.4 (5)... 

In discussing these results, let us first analyze the case of methylated surfaces in air. This case can be regarded as a rather simple one for two reasons. First, there are only dispersion interactions present in this case, as the methyl groups effectively screen the nondispersion interactions of glass. Second, there is no adsorption from the air on a hydrophobic surface. Because of this, in Equation 1.49,... 

This relationship requires an independent estimate for Hq. Alternatively, it can be used to estimate the value of Hq from approximate estimates of WiQiq) determined experimentally for the coagulation-peptization transition. In the general case of nondispersion interactions, we only have... 

Owens-Wendt-Rabel-Kaelble (OWRK) method. Owens and Wendt [19] modified the Fowkes model by assuming that solid surface tension and liquid surface tensions are composed of two components, namely, a dispersion component and a hydrogenbonding component. The nondispersive interaction was included into the hydrogenbonding component. Nearly at the same time, Rabel [20] and Kaelble [21] also published a very similar equation by partitioning the solid surface tension into dispersion and polar components. Subsequent researchers called this as the OWRK method, and ysv and jiv can be expressed as... 

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