A small-angle neutron and static light scattering study of micelles formed in aqueous mixtures of a nonionic alkylglucoside and an anionic surfactant.
The size and shape of micelles formed in aqueous mixtures of the anionic surfactant sodium dodecyl sulfate (SDS) and the nonionic sugar-based surfactant n-decyl beta-D-glucopyranoside (C(10)G) at different concentrations of added salt have been investigated with small-angle neutron and static light scattering. Rather small prolate ellipsoidal micelles form in the absence of added salt and at [NaCl] = 10 mM in D(2)O. The micelles grow considerably in length to large rods as the electrolyte concentration is raised to [NaCl] = 0.1 M. In excess of nonionic surfactant ([SDS]/[C(10)G] = 1:3) at [NaCl] = 0.1 M in D(2)O, several thousands of Angstroms long wormlike micelles are observed. Most interestingly, a conspicuously large isotope solvent effect was observed from static light scattering data according to which micelles formed at [SDS]/[C(10)G] = 1:3 and [NaCl] = 0.1 M in H(2)O are at least five times smaller than micelles formed in the corresponding samples in D(2)O.
Bergström
L Magnus
LM
Department of Pharmacy, Pharmaceutical Physical Chemistry, Box 580, Uppsala University, SE-751 23 Uppsala, Sweden. magnus.bergstrom@farmaci.uu.se
Bastardo
Luis A
LA
Garamus
Vasil M
VM
D000478:Alkylation; D005947:Glucose / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D008823:Micelles; D009502:Neutrons; D013501:Surface-Active Agents / Q000737:chemistry*
D007477:Ions; D008823:Micelles; D013501:Surface-Active Agents; D005947:Glucose