期刊
ANALYTICAL CHEMISTRY
卷 81, 期 24, 页码 10149-10155出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac901913r
关键词
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资金
- Chemical Sciences, Geosciences, and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-06ER15758]
- Robert A. Welch Foundation [F-0032]
- HLRB pr26wo
- National Science Foundation
- U.S. Department of Energy (DOE) [DE-FG02-06ER15758] Funding Source: U.S. Department of Energy (DOE)
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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