Electroconvection near two-layer composite microparticles

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Abstract

This paper presents the results of a numerical simulation of an electrolyte solution behavior near a spherical dielectric microparticle covered with a homogeneous ion-selective shell under the influence of an external electric field. The particle is assumed to be stationary, and the electrolyte either stays still or is pumped externally with a constant velocity in absence of the electric field. The field, in turn, generates electroosmotic flow near the particle’s surface. It is shown that concentration polarization can occur near the particle, whereas electrokinetic instability only occurs near particles with a sufficiently thick shell. When the particle’s surface charge is opposite to the one of its shell, non-stationary regimes may be observed when the shell is thin enough.

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About the authors

G. S. Ganchenko

Финансовый университет при Правительстве Российской Федерации

Email: shelistov_v@mail.ru

Лаборатория электро- и гидродинамики микро- и наномасштабов

Russian Federation, 125167, Москва, Ленинградский просп., 49/2

V. S. Shelistov

Финансовый университет при Правительстве Российской Федерации

Author for correspondence.
Email: shelistov_v@mail.ru

Лаборатория электро- и гидродинамики микро- и наномасштабов

Russian Federation, 125167, Москва, Ленинградский просп., 49/2

E. A. Demekhin

Финансовый университет при Правительстве Российской Федерации; НИИ механики МГУ им. М.В. Ломоносова

Email: shelistov_v@mail.ru

Лаборатория электро- и гидродинамики микро- и наномасштабов, Лаборатория общей аэродинамики

Russian Federation, 125167, Москва, Ленинградский просп., 49/2; 119192, Москва, Мичуринский просп., 1

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2. Fig. 1. Schematic representation of the composite microparticle.

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3. Fig. 2. Distributions of charge density and salt concentration outside the particle at, and . (a), (b) , (c) . The distributions inside the shell are not shown.

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4. Fig. 3. Distributions of (a) current through the surface and (b) electric potential along the symmetry axis at , and . Curves 1 - , curves 2 - .

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5. Fig. 4. (a), (c) - dependence of voltage drop in the area of spatial charge on the external field strength ; (b), (d) - dependence of integral current on . Graphs (a) and (b) are plotted without advection, , graphs (c) and (d) - with advection, . Curves 1 - , curves 2 - , curves 3 - . In all cases . The dotted line corresponds to non-stationary modes (with electroconvection), for which the current values are averaged over time.

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