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Perdue RK, Laws DR, Hlushkou D, et al. Bipolar electrode focusing: the effect of current and electric field on concentration enrichment. Anal Chem. 2009;81(24):10149-55doi: 10.1021/ac901913r.
Perdue, R. K., Laws, D. R., Hlushkou, D., Tallarek, U., & Crooks, R. M. (2009). Bipolar electrode focusing: the effect of current and electric field on concentration enrichment. Analytical chemistry, 81(24), 10149-55. https://doi.org/10.1021/ac901913r
Perdue, Robbyn K, et al. "Bipolar electrode focusing: the effect of current and electric field on concentration enrichment." Analytical chemistry vol. 81,24 (2009): 10149-55. doi: https://doi.org/10.1021/ac901913r
Perdue RK, Laws DR, Hlushkou D, Tallarek U, Crooks RM. Bipolar electrode focusing: the effect of current and electric field on concentration enrichment. Anal Chem. 2009 Dec 15;81(24):10149-55. doi: 10.1021/ac901913r. PMID: 19921775.
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Anal Chem. 2009 Dec 15;81(24):10149-55. doi: 10.1021/ac901913r.

Bipolar electrode focusing: the effect of current and electric field on concentration enrichment.

Analytical chemistry

Robbyn K Perdue, Derek R Laws, Dzmitry Hlushkou, Ulrich Tallarek, Richard M Crooks

Affiliations

  1. Department of Chemistry and Biochemistry, Center for Electrochemistry, The University of Texas at Austin, 1 University Station, A5300, Austin, Texas 78712-0165, USA.

PMID: 19921775 DOI: 10.1021/ac901913r

Abstract

Bipolar electrode focusing at discontinuous bipolar electrodes (BPEs) provides new insight into the faradaic current and electric field characteristics associated with the technique and allows for the controlled transport of a focused anionic tracer in a microfluidic channel. The findings corroborate our previously reported simulation results, which describe the formation of an extended electric field gradient leading to concentration enrichment. This gradient has been attributed to the passage of faradaic current through a BPE affixed to the floor of the microchannel. Our results demonstrate that the onset of faradaic current is coincident with the onset of concentration enrichment. Utilizing an array of microband electrodes, the tracer may be passed from one stationary position to another by rapidly relocating the BPE. However, the tracer movement is limited to one direction, confirming that the electrophoretic velocity of the analyte exceeds the electroosmosis-driven bulk fluid flow velocity at only the cathodic edge of the BPE.

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