Abstract
The influence of the addition of small quantities of isomeric alcohols (⩽ 0.5 mol %) of different alkyl chain length (C8 – C13) 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 αSAS/αROH. The characteristic adsorption parameters were therefore calculated for selected systems using the universal Frumkin surface equation of state (Hs ≠ 0) and a Langmuir-type equation (Hs = 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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