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Issue 24, 2011
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Combining rails and anchors with laser forcing for selective manipulation within 2D droplet arrays

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Abstract

We demonstrate the combination of a rails and anchors microfluidic system with laser forcing to enable the creation of highly controllable 2D droplet arrays. Water droplets residing in an oil phase can be pinned to anchor holes made in the base of a microfluidic channel, enabling the creation of arrays by the appropriate patterning of such holes. The introduction of laser forcing, via laser induced thermocapillary forces to anchored droplets, enables the selective extraction of particular droplets from an array. We also demonstrate that such anchor arrays can be filled with multiple, in our case two, droplets each and that if such droplets have different chemical contents, the application of a laser at their interface triggers their merging and a chemical reaction to take place. Finally by adding guiding rails within the microfluidic structure we can selectively fill large scale arrays with monodisperse droplets with significant control over their contents. In this way we make a droplet array filled with 96 droplets containing different concentrations of fluorescent microparticles.

Graphical abstract: Combining rails and anchors with laser forcing for selective manipulation within 2D droplet arrays

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Publication details

The article was received on 21 Jun 2011, accepted on 26 Sep 2011 and first published on 01 Nov 2011


Article type: Paper
DOI: 10.1039/C1LC20541B
Lab Chip, 2011,11, 4228-4234

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    Combining rails and anchors with laser forcing for selective manipulation within 2D droplet arrays

    E. Fradet, C. McDougall, P. Abbyad, R. Dangla, D. McGloin and C. N. Baroud, Lab Chip, 2011, 11, 4228
    DOI: 10.1039/C1LC20541B

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