On the Selectivity of an Insulator-Based Dielectrophoretic Microdevice

Insulator-based dielectrophoresis (iDEP) is a dielectrophoretic mode where non-uniform electric fields are created employing insulating structures. This article presents an evaluation of the selectivity of an iDEP microdevice by employing DC electric fields with mixtures of polystyrene nano and micr...

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Bibliographic Details
Published in:Separation science and technology 2010-09, Vol.46 (3), p.384-394
Main Authors: Chávez-Santoscoy, Ana V., Baylon-Cardiel, Javier L., Moncada-Hernández, Héctor, Lapizco-Encinas, Blanca H.
Format: Article
Language:English
Subjects:
dielectrophoresis
Electric fields
Electric potential
electrophoresis
Mathematical models
microchannel
microfluidics
Microparticles
Nanocomposites
Nanomaterials
Nanostructure
Selectivity
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Summary:Insulator-based dielectrophoresis (iDEP) is a dielectrophoretic mode where non-uniform electric fields are created employing insulating structures. This article presents an evaluation of the selectivity of an iDEP microdevice by employing DC electric fields with mixtures of polystyrene nano and microparticles. Experimental and mathematical modeling work was carried out in order to assess the selectivity of an iDEP microdevice to immobilize only the large particles from a binary mixture. Negative dielectrophoretic trapping was observed and the effects of particle concentration, concentration ratio, size ratio, and magnitude of the applied electric potential (200 to 600 V) on the microdevice selectivity were studied. The results demonstrated that high selectivity can be obtained with iDEP.
ISSN:0149-6395
1520-5754
DOI:10.1080/01496395.2010.520295