The electrochemical detection of droplets in microfluidic devices |
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Authors: | Liu Shujuan Gu Yunfeng Le Roux Rudolph B Matthews Sinéad M Bratton Daniel Yunus Kamran Fisher Adrian C Huck Wilhelm T S |
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Institution: | Department of Chemical Engineering, University of Cambridge, Cambridge, UKCB2 3RA. |
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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 microm wide and 250 microm deep cast out of poly(dimethylsiloxane) (PDMS) which is sealed onto a glass substrate containing a set of microelectrodes 100 microm 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. |
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