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Issue 8, 2007
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An optical toolbox for total control of droplet microfluidics

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The use of microfluidic drops as microreactors hinges on the active control of certain fundamental operations such as droplet formation, transport, division and fusion. Recent work has demonstrated that local heating from a focused laser can apply a thermocapillary force on a liquid interface sufficient to block the advance of a droplet in a microchannel (C. N. Baroud, J.-P. Delville, F. Gallaire and R. Wunenburger, Phys. Rev. E: Stat., Nonlinear, Soft Matter Phys., 2007, 75(4), 046302). Here, we demonstrate the generality of this optical approach by implementing the operations mentioned above, without the need for any special microfabrication or moving parts. We concentrate on the applications to droplet manipulation by implementing a wide range of building blocks, such as a droplet valve, sorter, fuser, or divider. We also show how the building blocks may be combined by implementing a valve and fuser using a single laser spot. The underlying fundamentals, namely regarding the fluid mechanical, physico-chemical and thermal aspects, will be discussed in future publications.

Graphical abstract: An optical toolbox for total control of droplet microfluidics

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Article information

15 Feb 2007
17 May 2007
First published
08 Jun 2007

Lab Chip, 2007,7, 1029-1033
Article type

An optical toolbox for total control of droplet microfluidics

C. N. Baroud, M. Robert de Saint Vincent and J. Delville, Lab Chip, 2007, 7, 1029
DOI: 10.1039/B702472J

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