INFLUENCE OF EXTERNAL FLOW ON THE CONCENTRATION OF CHARGED PARTICLES IN THE WAKE OF AN ION-SELECTIVE GRANULE
G.S. Ganchenko1, M.S. Alekseev1, V.S. Shelistov1, E.A. Demekhin1,2
1Financial University under the Government of the Russian Federation, Moscow, Russia
2Research Institute of Mechanics, Lomonosov Moscow State University, Moscow, Russia
Keywords: superconcentration, electroosmosis, direct numerical simulation
Abstract
The behavior of a three-component electrolyte in a microdevice utilizing a spherical ion-selective granule under an applied electric field and a pressure difference is investigated. In practical applications, one of the electrolyte components corresponds to charged analyte particles present at an initially low concentration. It is shown that the analyte concentration can be increased in the wake of the granule, and the degree of concentration enhancement is independent of the initial concentration. The physical mechanism of this phenomenon is described. This paper also presents the parameter values-such as the potential difference, pressure difference, and the characteristics of the electrolyte and the granule-for which this enhancement is achievable.
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