4.8 Article

Electrokinetics in microfluidic channels containing a floating electrode

Journal

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 32, Pages 10480-+

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ja8036405

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Electrokinetic transport within a buffer-filled microchannel incorporating a flat bipolar electrode is investigated. The key finding is that the presence of the electrode disrupts the passage of electrical current through the microchannel and thereby alters the uniformity of the local electric field. Electroosmotic flow further modulates the local field gradient. These dynamics are demonstrated experimentally by utilizing the field gradient for concentration enrichment of negatively charged tracer molecules, and a set of computer simulations is presented to interpret the underlying electrokinetics.

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