Critical micelle concentration of mixtures

Figure 3.7 Critical micelle concentration of mixtures of sodium n-dodecyl sulphonate and n-octylnonaglycolether.

Figure 3.3. Critical micelle concentrations of mixtures of sodium /2-dodecyl sulfonate and n-octylnonaglycol ether (5)...

The critical micelle concentrations of mixtures of POE nonionic surfactants are of particular interest, since the synthesis of such materials on a commercial basis will always produce a rather broad range of POE chain lengths. Because they contain no electrostatic contribution to the free energy of micelle formation, they can be treated theoretically with a simpler relationship between composition and cmc. In a mixture of nonionic surfactants in which the average POE chain lengths are approximately the same and the hydrocarbon chains different, there was a smooth decrease in the cmc of the mixture as the mole fraction of the more hydrophobic material (lower cmc) was increased, reminiscent of the surface tension-mole fraction curves found for miscible organic materials mixed with water. 

The critical micelle concentrations of mixtures of ionic and nonionic surfactants has not been as fuUy explored as that of mixtures of structurally related materials, although it appears as if such systems are reasonably well behaved. Using the assumption that the mole fraction of ionic and nonionic surfactants in the micelle is the same as the bulk ratio, a good correlation can be made between micellar aggregation number, cmc, and the composition of the mixture. 

---

See also in sourсe #XX -- [ , ]

---