ArticleAnalytical chemistry2021
Concentration-Polarization Electroosmosis near Insulating Constrictions within Microfluidic Channels.
Article in Analytical chemistry, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- High-resolution 3D-printed insulator-based dielectrophoresis devices for biomolecular manipulation.Analytical and bioanalytical chemistry · 2026Article
- Trapping of Micro- and Nanoparticles within Microfluidic Constrictions in AC Electric Fields.Analytical chemistry · 2025Article
- Editorial for the Micro/Nanoscale Electrokinetics Section.Micromachines · 2024Article
- Numerical Simulation of the Influence of Non-UniformMicromachines · 2024Article
- Numerical modeling reveals improved organelle separation for dielectrophoretic ratchet migration.Electrophoresis · 2023Article
- Dielectrophoresis: An Approach to Increase Sensitivity, Reduce Response Time and to Suppress Nonspecific Binding in Biosensors?Biosensors · 2022Review
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Authors and funding
5 authors.
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Abstract
Electric fields are commonly used to trap and separate micro- and nanoparticles near channel constrictions in microfluidic devices. The trapping mechanism is attributed to the electrical forces arising from the nonhomogeneous electric field caused by the constrictions, and the phenomenon is known as insulator-based-dielectrophoresis (iDEP). In this paper, we describe stationary electroosmotic flows of electrolytes around insulating constrictions induced by low frequency AC electric fields (below 10 kHz). Experimental characterization of the flows is described for two different channel heights (50 and 10 μm), together with numerical simulations based on an electrokinetic model that considers the modification of the local ionic concentration due to surface conductance on charged insulating walls. We term this phenomenon concentration-polarization electroosmosis (CPEO). The observed flow characteristics are in qualitative agreement with the predictions of this model. However, for shallow channels (10 μm), trapping of the particles on both sides of the constrictions is also observed. This particle and fluid behavior could play a major role in iDEP and could be easily misinterpreted as a dielectrophoretic force.
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