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Issue 11, 2008
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The electrochemical detection of droplets in microfluidic devices

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Abstract

This paper presents a new electrochemical method for the detection and characterisation of aqueous droplets in an organic carrier fluid (1,2-dichloroethane) formed in flow-focusing microfluidic devices. The devices consist of a conventional flow-focusing channel 250 μm wide and 250 μm deep cast out of poly(dimethylsiloxane) (PDMS) which is sealed onto a glass substrate containing a set of microelectrodes 100 μm long. Chronoamperometric analysis of a suitable electrolyte contained in the organic phase is presented for characterising the droplet frequency and size. This chronoamperometric method is then extended to a dual working electrode approach in order to determine the velocity of the droplet. Good agreement between experimental measurements and theory was observed.

Graphical abstract: The electrochemical detection of droplets in microfluidic devices

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Article information


Submitted
09 Jun 2008
Accepted
13 Aug 2008
First published
19 Sep 2008

Lab Chip, 2008,8, 1937-1942
Article type
Paper

The electrochemical detection of droplets in microfluidic devices

S. Liu, Y. Gu, R. B. Le Roux, S. M. Matthews, D. Bratton, K. Yunus, A. C. Fisher and W. T. S. Huck, Lab Chip, 2008, 8, 1937
DOI: 10.1039/B809744E

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