Partition constants of alcohols and surfactants in mixed alcohol/10-carbon dimeric amphiphile aggregates from NMR-diffusion experiments.

The partition constants (-values) of primary alcohols in solutions containing aggregates of some symmetric dimeric (gemini) surfactants ,'-dimethyl,'-didecyl-α,ω-alkanediammonium dibromide (10--10 gemini surfactants) have been computed from the diffusion coefficients NMR spectroscopy. From the partition constants, thermodynamic partition coefficients and Gibbs energies of transfer for the alcohols from the bulk DO phase to the dimeric aggregate phase have been calculated. For 10-6-10 and 10-8-10 surfactants, the partition constants for two primary alcohols, 1-butanol (COH) and 1-pentanol (COH), increased with increasing the amount of the surfactant in the solution, while the thermodynamic partition coefficients and the calculated Gibbs transfer energies were constant with increasing surfactant concentration.