Effects of Carbon Numbers and Concentration of Alkanol Cosurfactants on the CMC and Thermodynamic Properties of Span80 in N,N-Dimethylformamide Solvent by Microcalorimetry

摘要

The power time curves of the micelle formation process were determined for nonionic surfactants (Span80) in N,N-dimethylformamide solvent with alkanol (n-heptanol, n-octanol, n-nonanol, n-decanol) by titration microcalorimetry. The critical micelle concentration (CMC), aggregation number (n) and thermodynamic functions (Delta H-r(m)theta, Delta(r)G(m)(theta), Delta S-r(m)theta) were obtained at different alkanol cosurfactants and concentrations. Effects of carbon numbers and concentration of alkanol cosurfactants on the CMC and thermodynamic properties of Span80 in N,N-dimethylformamide solvent were discussed.