Summary
The effect of electrolytes on the concentration dependence of surface tension of some polyoxyethylated nonionic surfactants has been studied as a function of the electrolyte concentration and the lyotropic number of the ions. The lowering in the c.m.c. values in the case of electrolytes has been explained on the basis of salting out mechanism.
On the other hand the increase in the c.m.c. observed in the case of urea and dioxane has been explained to factors like the hydration of the ethylene oxide chain and monomer solubility respectively.
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Malik, W.U., Jhamb, O.P. Critical micelle concentration of some polyoxyethylated non-ionic surfactants and the effect of additives. Kolloid-Z.u.Z.Polymere 242, 1209–1211 (1970). https://doi.org/10.1007/BF02084729
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DOI: https://doi.org/10.1007/BF02084729