Structure and dynamics of concentrated micellar solutions of sodium dodecyl sulfate

In micellar solutions of sodium dodecyl sulfate, as the concentration of surfactants increases, the spheroid shape of the micelles changes from almost spherical to ellipsoidal with increasing ratio of half-axes ratio, and further the transition to cylindrical micelles occurs. The micelles in an aque...

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Bibliographic Details
Published in:Russian chemical bulletin 2016, Vol.65 (1), p.158-166
Main Authors: Gubaidullin, A. T., Litvinov, I. A., Samigullina, A. I., Zueva, O. S., Rukhlov, V. S., Idiyatullin, B. Z., Zuev, Yu. F.
Format: Article
Language:English
Subjects:
Aqueous solutions
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Contact angle
Diffusion layers
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Inorganic Chemistry
Micelles
Nonuniformity
Organic Chemistry
Sodium dodecyl sulfate
Surfactants
Thickness
X-ray scattering
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Summary:In micellar solutions of sodium dodecyl sulfate, as the concentration of surfactants increases, the spheroid shape of the micelles changes from almost spherical to ellipsoidal with increasing ratio of half-axes ratio, and further the transition to cylindrical micelles occurs. The micelles in an aqueous solution can directly contact (compact aggregates) or be separated from one another by layers of intermicellar medium (periodical colloid structures). In the latter case, the thickness of the layer can significantly exceed the micelle size, and then no mutual correlation in micelle arrangement is observed. According to the data of small-angle X-ray scattering, the relationship between the surfactant concentration and formation of “quasi-crystalline” micellar structure is nonlinear, which can be due to both micelle aggregation processes and nonuniformity of their structure. The possible influence of ordered micellar structures on the diffusion mobility of micelles is shown.
ISSN:1066-5285
1573-9171
DOI:10.1007/s11172-016-1278-2