Abstract
The power-time curves of micellar formation of two anionic surfactants, sodium laurate (SLA) and sodium dodecyl sulfate (SDS), in N,N-dimethyl acetamide (DMA) in the presence of various long-chain alcohols (1-heptanol, 1-octanol, 1-nonanol and 1-decanol) were measured by titration microcalorimetry at 298 K. The critical micelle concentrations (CMCs) of SLA and SDS under various conditions at 298 K were obtained based on the power-time curves. Thermodynamic parameters (DH � , DSand DG � ) for micellar systems at 298 K were evaluated according to the power-time curves and the mass action model. The influences of the number of car- bon-atom and the concentration of alcohol were investi- gated. Moreover, combined the thermodynamic parameters at 303, 308 and 313 K in our previous work and those of 298 K in the present work for SLA and SDS in DMA in the presence of long-chain alcohols, an enthalpy-entropy compensation effect was observed. The values of the enthalpy of micellization calculated by direct and indirect methods were made a comparison.
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