Dielectrophoretic Crossover Frequency of Single Particles: Quantifying the Effect of Surface Functional Groups and Electrohydrodynamic Flow Drag Force

Nanomaterials
Yun-Wei LuJia-Yang Juang

Abstract

We present a comprehensive comparison of dielectrophoretic (DEP) crossover frequency of single particles determined by various experimental methods and theoretical models under the same conditions, and ensure that discrepancy due to uncertain or inconsistent material properties and electrode design can be minimized. Our experiment shows that sulfate- and carboxyl-functionalized particles have higher crossover frequencies than non-functionalized ones, which is attributed to the electric double layer (EDL). To better understand the formation of the EDL, we performed simulations to study the relationship between initial surface charge density, surface ion adsorption, effective surface conductance, and functional groups of both functionalized and nonfunctionalized particles in media with various conductivities. We also conducted detailed simulations to quantify how much error may be introduced if concurrent electrohydrodynamic forces, such as electrothermal and electro-osmotic forces, are not properly avoided during the crossover frequency measurement.

References

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Citations

Dec 20, 2020·Electrophoresis·Mohammad Rizwen Ur RahmanWoo-Jin Chang
Jun 30, 2021·Biomedical Microdevices·Mohammad Rizwen Ur RahmanWoo-Jin Chang

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Methods Mentioned

BETA
optical tweezers
Chip

Software Mentioned

COMSOL

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