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Issue 5, 2014
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Electrostatic potential wells for on-demand drop manipulation in microchannels

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Abstract

Precise control and manipulation of individual drops are crucial in many lab-on-a-chip applications. We present a novel hybrid concept for channel-based discrete microfluidics with integrated electrowetting functionality by incorporating co-planar electrodes (separated by a narrow gap) in one of the microchannel walls. By combining the high throughput of channel-based microfluidics with the individual drop control achieved using electrical actuation, we acquire the strengths of both worlds. The tunable strength of the electrostatic forces enables a wide range of drop manipulations, such as on-demand trapping and release, guiding, and sorting of drops in the microchannel. In each of these scenarios, the retaining electrostatic force competes with the hydrodynamic drag force. The conditions for trapping can be predicted using a simple model that balances these forces.

Graphical abstract: Electrostatic potential wells for on-demand drop manipulation in microchannels

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Publication details

The article was received on 03 Oct 2013, accepted on 25 Nov 2013 and first published on 25 Nov 2013


Article type: Paper
DOI: 10.1039/C3LC51121A
Citation: Lab Chip, 2014,14, 883-891
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    Electrostatic potential wells for on-demand drop manipulation in microchannels

    R. de Ruiter, A. M. Pit, V. M. de Oliveira, M. H. G. Duits, D. van den Ende and F. Mugele, Lab Chip, 2014, 14, 883
    DOI: 10.1039/C3LC51121A

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