Ducleaux-Traube rule

Traube rule, more often referred to as the Traube rule. In agreement with eq. (II. 12), the Ducleaux-Traube rule corresponds to a linear relationship between the surfactant chain length and the p0 - pj,s) value. The latter may be viewed as the work of adsorption performed under standard conditions. Indeed, let us assume that the work of adsorption, p0 - p(0s), is a linear function of the number of carbon atoms in the surfactant hydrocarbon chain, i.e ... 

The value of cpCH2 that corresponds to the Ducleaux-Traube rule is approximately equal to R7Tn (3-3.5)= 3 kJ. 

Fig 11-12. The validity of the Ducleaux- Traube rule for the three surfactants, the neighboring members of the same homologous series... 

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