Abstract
The influence of the addition of small quantities of isomeric alcohols (⩽ 0.5 mol %) of different alkyl chain length (C 8 – C 13) on the surface tension of sodium decyl sulfate (SDS) and sodium dodecyl sulfate (SDDS) solutions in the concentration region ⩽ CMC (critical micelle concentration) was systematically investigated. The surface tension of pure sodium alkyl sulfate (SAS) solutions ( c ⩽ CMC) progressively decreases with increasing chain length of the straight-chain alcohol added. Isomeric alcohols with the same total C number on the surface tension of SAS depends on the branching ratio of the alcohol. The results are explained by the change in the ratio of the bulk—surface distribution coefficients α SAS/α ROH. The characteristic adsorption parameters were therefore calculated for selected systems using the universal Frumkin surface equation of state ( H s ≠ 0) and a Langmuir-type equation ( H s = 0). On the basis of the generalized Szyszkowski equation a method for calculating the bulk—surface distribution coefficient of slightly soluble isomeric alcohol is proposed.
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