Abstract
Abstract The acceleration rate (dα/dXam) of the dissociation degree (α) of ionic SDS micelles to the mole fraction (Xam) of solubilized additives has been determined at infinite dilution by a differential conductivity method. The additives used were a homologous series of amphiphiles with different types of polar groups: alkylglucosides, MEGAs, diols, and cyclooctanol. The method allows us to determine the partition coefficient between the bulk water and the micelles (Kx) and the rate of depression (Csf/Caf) of the monomer surfactant concentration (Csf) to the monomer additive (Caf), in addition to dα/dXam. The results are as follows: (1) dα/dXam in each homologous series is independent of the alkyl chain length, indicating a characteristic value of each polar group. (2) dα/dXam increases with increasing molecular weight of the groups, representing the size effect on the counter ion dissociation. (3) For diols, dα/dXam is higher than twice that of 1-alkanols, due to a large effective size. (4) Kx is dependent on the alkychain length, but independent of the polar group types, indicating that the net charge on the surface of the micelles remains unaltered by solubilization. (5) (Csf/Caf) determined above cmc is identical with the cmc decreasing rate, Δcmc/ΔCa, at cmc.
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