Electrical percolation in micellar sodium dodecyl sulfate solutions. a phenomenological consideration
- Authors: Us’yarov O.G.1, Movchan T.G.2
-
Affiliations:
- St. Petersburg State University
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Issue: Vol 78, No 5 (2016)
- Pages: 705-711
- Section: Article
- URL: https://journal-vniispk.ru/1061-933X/article/view/201068
- DOI: https://doi.org/10.1134/S1061933X16050239
- ID: 201068
Cite item
Abstract
Effects of electrical percolation accompanying variations in overall surfactant concentration с have been studied by the example of micellar sodium dodecyl sulfate solutions. It has been found that, in the studied concentration range of 0.001–1.2 M, dependences of electrical conductivity K on c may exhibit at least three break points, with the dK/dc derivatives changing in the vicinities of these points. At two of these points, which are reliably identified and correspond to critical micelle concentrations (CMC1 and CMC2), they decrease. At the third concentration, lying between CMC1 and CMC2, the dK/dc derivative increases. A substantiated assumption has been put forward that this break point, at which the dK/dc derivative increases, results from the clustering of micelles and the appearance of channels with a higher specific conductivity, which is provided by the contribution from the electrical conductivity of the diffuse and dense parts of micelle electrical double layers, upon the formation of clusters. The ionic surfactant concentration that corresponds to the break point at which the dK/dc value increases has been denoted as the critical percolation concentration.
About the authors
O. G. Us’yarov
St. Petersburg State University
Author for correspondence.
Email: usyarov.oleg@mail.ru
Russian Federation, Universitetskaya nab. 7/9, St. Petersburg, 199034
T. G. Movchan
Frumkin Institute of Physical Chemistry and Electrochemistry
Email: usyarov.oleg@mail.ru
Russian Federation, Leninskii pr. 31, Moscow, 119071
Supplementary files
