Abstract
Methods for calculation of specific conductance of ions and micelles and the degree of micelle ionization using conductometric data in various approximations of the Debye – Hückel – Onsager theory were considered. The analysis of the existing calculation methods was carried out to identify their drawbacks and to suggest ways of their elimination. The calculation method of the micellar parameters on the basis of conductometric data using micellar size was modified, and a new formula for determining the degree of micelle ionization was obtained. All calculations using the modified method were performed in the first and the second approximations, and the newly obtained values of the micellar parameters are in greater agreement with the results of other studies. Based on the calculations performed, it was shown that the contribution of micelles to the total conductivity of micellar solution cannot be neglected, since at high concentrations the contribution of micelles exceeds the contribution of counterions and can exceed 50%.
Highlights
The variety of practical use of aqueous surfactant solutions in power engineering, electronics and other technical applications [1,2,3], provides the basis for a comprehensive study of these materials by various methods
Surfactant solutions belong to organized solutions due to the special properties of surfactant molecules that tend to self-association and formation of ordered structures
To eliminate the error associated with the values of equivalent electrical conductivity of ions, and to calculate more correct values of + and – in the case of any surfactant concentrations, we developed a method based on using the second approximation of the Debye – Hückel – Onsager theory
Summary
The variety of practical use of aqueous surfactant solutions in power engineering, electronics and other technical applications [1,2,3], provides the basis for a comprehensive study of these materials by various methods. The ability to control and manage nanostructural changes in the ways of organizing surfactant molecules both inside the solution and on the interface surfaces can give a new impulse to the use of such media in power engineering and electronics. Conductometric data is important in the case of surfactants applying in the electrolyte composition of energy-saving devices, since the directed selection of an appropriate electrolyte requires data on the electrical conductivity (mobility) of ions and micelles as well as on the charge and ionization degree of the formed micelles and their contribution to the total conductivity of solution. The purposes of this work were the following: analyzing existing computational methods; modifying a calculation method for specific conductance of ions and micelles; determining the degree of micelle ionization using conductometric data in the first and the second approximations of the Debye – Hückel – Onsager theory and estimating the contribution of micelles to the total conductivity of micellar solution
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