The physics of the movement of a composite microparticle with a thin ion-selective shell in an external electric field

G. S. Ganchenko^a, V. S. Shelistov^a, E. A. Demekhin<sup>ab

a</sup> Financial University under the Government of the Russian Federation, Moscow
^b Lomonosov Moscow State University, Institute of Mechanics

Abstract: The movement of a nonuniform particle in an electrolyte solution under the action of an external electric field is considered in the work. The inner part (the core) of the particle is assumed to be a solid dielectric, which is surrounded by a thin ion-selective shell. It is believed that such a model describes the behavior of a number of real particles (especially biological ones) more precisely than the uniform one. The features of electrophoretic movement of such a particle have been theoretically investigated, the velocity of this movement has been obtained, a comparison with electrophoresis of a uniform dielectric particle and of a uniform ion-selective particle has been made. Several movement regimes have been found, their stability has been estimated.

Keywords: electrophoresis, composite particle, electroosmosis, concentration polarization, instability.

Received: 23.04.2025
Revised: 16.05.2025
Accepted: 16.05.2025

DOI: 10.61011/PJTF.2025.15.60812.20355

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