Small-angle neutron scattering study of mixtures of cationic polyelectrolyte and anionic surfactant: Effect of polyelectrolyte charge density
2004 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 108, no 6, 1874-1881 p.Article in journal (Refereed) Published
We have studied mixtures of an anionic surfactant (deuterated sodium dodecyl sulfate, SDS-d) and cationic polyelectrolytes with different charge densities (10%, 30%, 60%, and 100%) using small-angle neutron scattering (SANS). Near compositions corresponding to charge neutralization, the solutions phase separate into a complex phase (precipitate) consisting of, in the cases of 30%, 60%, and 100% charge density, a two-dimensional (213) hexagonal lattice of close-packed cylindrical micelles and a clear liquid. When either polyelectrolyte with charge density less than 100% or SDS-d is present in sufficient excess, the solution becomes clear and isotropic, and from the scattering data we may conclude that prolate or rod-shaped micelles are present. The micelles are seen to grow in length with increasing SDS-d concentration and polyelectrolyte charge density from about 80 Angstrom to 550 Angstrom, whereas the cross-sectional radius is 15 Angstrom and approximately constant. The number of micelles per polyelectrolyte chain is found to be slightly larger than unity (1-6). In some of the (turbid) samples rod-shaped micelles are found to coexist with larger polyelectrolyte-surfactant complexes. Solutions consisting of 10% charged polyelectrolyte and SDS-d are very viscous and gellike, and the complex phase is much less defined with a much larger distance between adjacent aggregates in the complex phase.
Place, publisher, year, edition, pages
2004. Vol. 108, no 6, 1874-1881 p.
x-ray-scattering, polymer surfactant, complexes, micelles, phase, water, association, colloids, lecithin, sulfate
IdentifiersURN: urn:nbn:se:kth:diva-23152DOI: 10.1021/jp036562xISI: 000188831700013ScopusID: 2-s2.0-1342323620OAI: oai:DiVA.org:kth-23152DiVA: diva2:341850
QC 20100525 QC 201110312010-08-102010-08-102011-10-31Bibliographically approved