Effect of 1-alkanols on the critical micelle concentration of sodium dodecyl benzene sulfonate

Abstract EN

The critical micelle concentration (CMC) of sodium dodecyl benzene sulfonate (SDBS) in the presence of small amounts of 1-alkanols (Cj-C4,C6, C8) was determined by the conductivity method at 25°C.

The CMC decreases linearly with an increase in the concentration (Ca) of the added 1 -alkanols, within their low concentration ranges.

The limiting slopes (-ACMC/ACa) were estimated from the straight lines for each alcohol.

Using these slopes the standard free energy change of transfer per methylene (CH2) group, AG°(CH2), from water to SDBS micelles has been calculated.

Solubilization of 1-alkanols by SDBS has been discussed in terms of additive-micelle hydrophobic interaction.