Electrochemical detection of droplet content in microfluidic devices: Evidence of internal recirculating convection within droplets |
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| Affiliation: | 1. LUNAM Université, Université de Nantes, CNRS, Laboratoire de Thermocinétique de Nantes, UMR 6607, La Chantrerie, rue Christian Pauc, BP 50609, 44306 Nantes cedex 3, France;2. LUNAM Université, GEPEA UMR CNRS 6144, BP 406, 37 boulevard de l’Université, 44602 Saint Nazaire, France;3. Istituto Motori – CNR, Via Marconi 8, 80125 Napoli, Italy;1. Instituto de Química, Universidade Federal de Goiás, Campus Samambaia, 74690-900 Goiânia, GO, Brazil;2. Instituto Nacional de Ciência e Tecnologia de Bioanalítica, 13084-971 Campinas, SP, Brazil;1. Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Ctra. Madrid-Barcelona, Km. 28802, Alcalá de Henares, Madrid 28871, Spain;2. Department of Neonatology, Instituto del Niño y del Adolescente, Hospital Clínico San Carlos-IdISSC, 28040 Madrid, Spain;3. Department of Chemistry in Pharmaceutical Sciences, Faculty of Pharmacy, Complutense University of Madrid, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain;4. Chemical Research Institute “Andrés M. Del Rio”, University of Alcalá́, Madrid, Spain |
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| Abstract: | The electrochemical detection of aqueous droplets carried by an immiscible oil-phase was investigated in a rectangular microchannel. Droplets having large aspect ratio as plugs were generated on demand and their electroactive content was detected amperometrically by a channel microband electrode. Under these conditions, electrode responses showed steady-state currents during the passage of droplets. The influence of electrode width and droplet velocity on faradaic current was studied. Results demonstrated that mass transfer to the electrode was controlled by convective flow regimes. Internal recirculating convection was evidenced in comparison to known operating regimes of microchannel electrodes in continuous pressure-driven flow. |
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