The sizes of sodium dodecyl sulfate (SDS) micelles in mixtures of H2O and D2O have been measured at several different ionic strengths and temperatures. The changes in micelle size due to H2O/D2O substitution are greatest at high ionic strength. Electrical conductivity and light scattering measurements indicate that head group repulsions between surfactant molecules, as well as intermicellar interactions, are the same in H2O and D2O solutions. The conclusion is that a small difference in the strength of hydrophobic bonds between H2O and D2O is responsible for the dramatic changes in micelle size. In addition, the critical micelle concentrations of a homologous series of sodium alkyl sulfates in H2O and D2O and for SDS in solutions containing various ratios of H2O/D2O are reported.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of physical chemistry|
|State||Published - Dec 1 1985|