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Modeling the AC Electrokinetic Behavior of Semiconducting Spheres


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Opened Access Modeling the AC Electrokinetic Behavior of Semiconducting Spheres

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Author: García Sánchez, Pablo
Flores Mena, Jose Eladio
Ramos Reyes, Antonio
Department: Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Date: 2019-01
Published in: Micromachines, 10 (2), 100.
Document type: Article
Abstract: We study theoretically the dielectrophoresis and electrorotation of a semiconducting microsphere immersed in an aqueous electrolyte. To this end, the particle polarizability is calculated from first principles for arbitrary thickness of the Debye layers in liquid and semiconductor. We show that the polarizability dispersion arises from the combination of two relaxation interfacial phenomena: charging of the electrical double layer and the Maxwell–Wagner relaxation. We also calculate the particle polarizability in the limit of thin electrical double layers, which greatly simplifies the analytical calculations. Finally, we show the model predictions for two relevant materials (ZnO and doped silicon) and discuss the limits of validity of the thin double layer approximation.
Cite: García Sánchez, P., Flores Mena, J.E. y Ramos Reyes, A. (2019). Modeling the AC Electrokinetic Behavior of Semiconducting Spheres. Micromachines, 10 (2), 100.
Size: 4.251Mb
Format: PDF


DOI: 10.3390/mi10020100

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