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Issue 24, 2011
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Partial-post laplace barriers for virtual confinement, stable displacement, and >5 cm s−1 electrowetting transport

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Abstract

Laplace barriers composed of full-posts or ridges have been previously reported as a mechanism for virtual fluid confinement, but with unstable displacement (capillary fingering or fluid trapping, respectively). A new platform of ‘partial-posts’ eliminates the disadvantages of full-posts or ridges, while providing ∼60–80% open channel area for rapid electrowetting fluid transport (>5 cm s−1). The fluid mechanics of partial-post Laplace barriers are far more complex than previous Laplace barriers as it involves two mechanisms: fluid can first begin to propagate either between, or under, the partial-posts. Careful design of channel and partial-post geometries is required, else one mechanism will dominate over the other. The physics and performance of partial-post Laplace barriers are verified using theoretical equations, experimental results, and dynamic numerical modeling.

Graphical abstract: Partial-post laplace barriers for virtual confinement, stable displacement, and >5 cm s−1 electrowetting transport

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Publication details

The article was received on 11 Aug 2011, accepted on 07 Oct 2011 and first published on 28 Oct 2011


Article type: Paper
DOI: 10.1039/C1LC20749K
Lab Chip, 2011,11, 4221-4227

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    Partial-post laplace barriers for virtual confinement, stable displacement, and >5 cm s−1 electrowetting transport

    E. Kreit, B. M. Mognetti, J. M. Yeomans and J. Heikenfeld, Lab Chip, 2011, 11, 4221
    DOI: 10.1039/C1LC20749K

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