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Issue 16, 2011
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Photoreversible fragmentation of a liquid interface for micro-droplet generation by light actuation

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Abstract

We describe a method to induce by light a reversible switch from a continuous two-phase laminar flow to a droplet generating regime, in microfluidic devices with a usual water-in-oil flow focusing geometry. It consists in adding a photosensitive surfactant to the aqueous phase to modulate using light the interfacial energy between flowing liquids and the microfluidic substrate. We show that UV irradiation induces liquid fragmentation into monodisperse water microdroplets and that many cycles of reversible and rapid switches (<2 s) between continuous laminar flows and stable droplet regimes can be realized. By spatially controlling the application of the light stimulus, we also demonstrate the first spatially resolved remote induction of droplet generation.

Graphical abstract: Photoreversible fragmentation of a liquid interface for micro-droplet generation by light actuation

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Publication details

The article was received on 19 Apr 2011, accepted on 16 Jun 2011 and first published on 05 Jul 2011


Article type: Communication
DOI: 10.1039/C1LC20328B
Citation: Lab Chip, 2011,11, 2666-2669
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    Photoreversible fragmentation of a liquid interface for micro-droplet generation by light actuation

    A. Diguet, H. Li, N. Queyriaux, Y. Chen and D. Baigl, Lab Chip, 2011, 11, 2666
    DOI: 10.1039/C1LC20328B

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