Induced-charge electroosmotic trapping of particles

Position-controllable trapping of particles on the surface of a bipolar metal strip by induced-charge electroosmotic (ICEO) flow is presented herein. We demonstrate a nonlinear ICEO slip profile on the electrode surface accounting for stable particle trapping behaviors above the double-layer relaxat...

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Bibliographic Details
Published in:Lab on a chip 2015-05, Vol.15 (10), p.2181-2191
Main Authors: Ren, Yukun, Liu, Weiyu, Jia, Yankai, Tao, Ye, Shao, Jinyou, Ding, Yucheng, Jiang, Hongyuan
Format: Article
Language:English
Subjects:
Broken symmetry
Direct current
Drag
Electrodes
Field effect transistors
Microfluidics
Slip
Trapping
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Summary:Position-controllable trapping of particles on the surface of a bipolar metal strip by induced-charge electroosmotic (ICEO) flow is presented herein. We demonstrate a nonlinear ICEO slip profile on the electrode surface accounting for stable particle trapping behaviors above the double-layer relaxation frequency, while no trapping occurs in the DC limit as a result of a strong upward fluidic drag induced by a linear ICEO slip profile. By extending an AC-flow field effect transistor from the DC limit to the AC field, we reveal that fixed-potential ICEO exceeding RC charging frequency can adjust the particle trapping position flexibly by generating controllable symmetry breaking in a vortex flow pattern. Our results open up new opportunities to manipulate microscopic objects in modern microfluidic systems by using ICEO.
ISSN:1473-0197
1473-0189
DOI:10.1039/c5lc00058k