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Mixing characterization inside microdroplets engineered on a microcoalescer

Sarrazin, Flavie and Prat, Laurent E. and Di Miceli, Nathalie and Cristobal, Galder and Link, D.R. and Weitz, D.A. Mixing characterization inside microdroplets engineered on a microcoalescer. (2007) Chemical Engineering Science, vol. 6 (n° 4). pp. 1042-1048. ISSN 0009-2509

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Official URL: http://dx.doi.org/10.1016/j.ces.2006.10.013

Abstract

We use a microdevice where microdroplets of reagents are generated and coalesce in a carrier continuous phase. The work focuses on the characterization of the mixing step inside the droplets, in the perspective to use them for chemical kinetic data acquisition. A dye and water are used, and an acid–base instantaneous chemical reaction is monitored thanks to a colored indicator. Acquisitions are done with a high-speed camera coupled to a microscope and a mixing parameter is calculated by image analysis. Different angles of bended channels and different ways of coalescence are compared. It is shown that the homogenization of the droplets can be reached in less than 10 ms after coalescence. This is achieved by forcing the droplets to coalesce in a “shifted” way, and later by adding 45◦ angle bends along the channel.

Item Type:Article
Additional Information:This publication is available on http://www.sciencedirect.com/science/journal/00092509
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Harvard university (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Rhodia (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Laurent PRAT
Deposited On:16 Oct 2008 14:20

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