Tensionetric and dilatational rheological characteristics of solutions of dicationic diimidazolium surfactants mixtures with extremely short spacer fragments and anionic surfactants (sodium dodecyl sulfate, sulfonol, sodium 3-laureth sulfate) at the interface with air were studied using the pendant drop and oscillating drop methods. The nature of interaction between dicationic and anionic surfactants depends on the structure of the anionic surfactant molecules. The possibility of forming strong complexes between a dicationic surfactant with 4 methylene groups in the spacer fragment and sodium dodecyl sulfate with the component ratio close to 1 : 1 was shown. It was found that the resulting complexes are stable in the neutral and slightly acidic pH range.
Khil'ko et al. (Wed,) studied this question.