Evaluation of the Lifshitz−van Der Waals/Acid−Base Approach To Determine Interfacial Tensions. 2. Interfacial Tensions of Liquid−Liquid Systems

The Lifshitz−van der Waals/acid−base (van Oss) approach is tested using experimental interfacial tensions of a large number of liquid−liquid mixtures, as suggested by several researchers 3,24,27 - 30 who wish to see wetting theories validated from liquid−liquid interfacial tensions. It is found that the van Oss approach does not predict correct interfacial tensions of virtually any liquid pairs in question. For example, the calculated interfacial tension of 1-bromonaphthalene−pentane is 7.0 mJ/m 2; but this liquid combination is found to be miscible. It is also shown that the liquid surface tension components recently suggested by Lee 40 have no impact on the calculated interfacial tension values. The van Oss approach is flawed, giving erroneous results, regardless of whether one employs the set of components from van Oss et al. 3 or Lee. 40