Synergy in Wetting by Mixtures of Surfactants

TABLE 6-2 Wetting Efficiencies of Surfactants in Aqueous Solution (Concentrations for 25 s Sinking Time at 25° C in Draves Test) 

The addition of long-chain alcohols to aqueous anionic and nonionic surfactant solutions is reported to increase their wetting power (Gerault, 1964 Bland, 1968) and the addition of metal soaps, especially those of the alkaline earth metals, is stated to increase the wetting power of dodecylpyridinium chloride solutions (Suzuki, 1967). 

As will be described in Chapter 11, the interaction of two different types of surfactants with each other, either in mixed monolayers at an interface or in mixed 

---