Journal
CHEMPHYSCHEM
Volume 4, Issue 10, Pages 1065-1072Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200300725
Keywords
aggregation; dielectric relaxation; hydration; micelles; molecular dynamics
Ask authors/readers for more resources
Dielectric spectra have been measured for aqueous sodium dodecylsulfate (SDS) solutions up to 0.1 molL(-1) at 25degreesC over the frequency range 0.005 less than or equal to nu GHz(-1) less than or equal to 89. The spectra exhibit two relaxation processes at approximately 0.03 GHz and 0.2 GHz associated with the presence of micelles in addition to the dominant solvent relaxation process at approximately 18 GHz and a small contribution at approximately 1.8 GHz due to H2O molecules hydrating the micelles. Detailed analysis reveals that the micelles bind 20 water molecules per SDS unit, but not as strongly as trimethylalkylammonium halide surfactants do. The relaxation times and amplitudes of both micelle relaxation processes can be simultaneously analysed with the theory of Grosse, yielding the effective volume of a SDS unit in the micelle and the lateral diffusion coefficent of the bound counterions. The findings of this investigation fully corroborate recent molecular dynamics simulations on structure and dynamics of SDS micelles.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available