Thermodynamics of the surfaces of nonionic spherical micelles with relatively large extensions of the interfacial layer


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Abstract

The structural properties of nonionic spherical micelles with relatively large extensions of the interfacial layer are investigated, and the size dependences of their adsorption, interfacial tension, and chemical potential are obtained. Such familiar thermodynamic relationships as the Gibbs and Laplace equations, the differential equation for the chemical potential, and the concept of hydrophilic–lipophilic balance are used. The method is applied to micelles formed in surfactant solutions of a homologous series of tetraethylene glycol alkyl ethers. The region of the existence of micellar solutions and the structural characteristics of the interfacial layer of micelles are determined. The interfacial tension minimum corresponding to ideal hydrophilic–lipophilic balance in the micelle interfacial layer is detected. The chemical potential is negative over the range of the homologous series, and its derivative with respect to the tension radius is also negative.

About the authors

V. S. Kuznetsov

Ivanovo State University

Email: vpzherdev@mail.ru
Russian Federation, Ivanovo, 153025

A. P. Blinov

Ivanovo State University

Email: vpzherdev@mail.ru
Russian Federation, Ivanovo, 153025

V. P. Zherdev

Ivanovo State Polytechnic University

Author for correspondence.
Email: vpzherdev@mail.ru
Russian Federation, Ivanovo, 153002

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