Nonequilibrium electrophoresis of an ion-selective microgranule for weak and moderate external electric fields
| Autor: | G. S. Ganchenko, Sakir Amiroudine, Evgeny A. Demekhin, E. A. Frants, V. S. Shelistov |
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| Rok vydání: | 2018 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Quantitative Biology::Biomolecules Mechanical Engineering Computational Mechanics 02 engineering and technology Dielectric Electrolyte 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Electric charge 010305 fluids & plasmas Condensed Matter::Soft Condensed Matter Electrokinetic phenomena Electrophoresis Mechanics of Materials Electric field 0103 physical sciences Electrohydrodynamics Perturbation theory 0210 nano-technology |
| Zdroj: | Physics of Fluids. 30:022001 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.5010084 |
| Popis: | Electrokinetics and the movement of charge-selective micro-granules in an electrolyte solution under the influence of an external electric field are investigated theoretically. Straightforward perturbation analysis is applied to a thin electric double layer and a weak external field, while a numerical solution is used for moderate electric fields. The asymptotic solution enables the determination of the salt concentration, electric charge distribution, and electro-osmotic velocity fields. It may also be used to obtain a simple analytical formula for the electrophoretic velocity in the case of quasi-equilibrium electrophoresis (electrophoresis of the first kind). This formula differs from the famous Helmholtz-Smoluchowski relation, which applies to dielectric microparticles, but not to ion-selective granules. Numerical calculations are used to validate the derived formula for weak external electric fields, but for moderate fields, nonlinear effects lead to a significant increase in electrophoretic mobility... |
| Databáze: | OpenAIRE |
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