To determine the increment of the standard free energy per methylene group ΔG0CH2 for ionic and nonionic surfactants, two calculation methods are proposed. One procedure is based on the adsorption energy parameter of the respective adsorption isotherm, and the second on the critical micelle concentration. Experimental surface tension isotherms for two homologous series, a nonionic (CnBHB) and an ionic (CnTAB) surfactant, are used to demonstrate how the methods work. As adsorption isotherms, the Frumkin and the reorientation models provide a rather good description for both surfactants. The free energy increments ΔG0 obtained from the two methods are the same if the reorientation model is used, but the Frumkin model gives different results.
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Miller et al. (2002) studied this question.
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