caa a22 4500 463235231 CHVBK 20180405153254.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10404-006-0128-1 doi (NATIONALLICENCE)springer-10.1007/s10404-006-0128-1 Integrated electrochemical velocimetry for microfluidic devices [Elektronische Daten] [Erik Kjeang, Bettina Roesch, Jonathan McKechnie, David Harrington, Ned Djilali, David Sinton] We present a new electrochemical velocimetry approach with direct electrical output that is capable of complete device-level integration. The steady reduction rate of a reversible redox species at an embedded microband working electrode is monitored amperometrically. Only one working electrode of arbitrary width is required; all three electrodes, including counter and reference electrodes, are integrated on-chip for complete miniaturization of the sensor. Experimental results are complemented by a theoretical framework including a full 3D electrochemical model as well as empirical mass transfer correlations and scaling laws. When the sensor is operated in the convective/diffusive transport controlled mode, the output signal becomes a predictable function of velocity in two distinct regimes: (i) in the low velocity regime, the signal is directly proportional to flow rate, and (ii) in the high velocity regime, the signal scales as the cube root of the mean velocity. The proposed velocimetry technique is applicable to all practicable pressure-driven laminar flows in microchannels with known cross-sectional geometry. Springer-Verlag, 2006 Microfluidics nationallicence Velocimetry nationallicence Flow sensor nationallicence Redox electrochemistry nationallicence Kjeang Erik Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut Roesch Bettina Department of Chemistry, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut McKechnie Jonathan Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut Harrington David Department of Chemistry, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut Djilali Ned Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut Sinton David Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut Microfluidics and Nanofluidics Springer-Verlag 3/4(2007-08-01), 403-416 1613-4982 3:4<403 2007 3 10404 https://doi.org/10.1007/s10404-006-0128-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10404-006-0128-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kjeang Erik Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut NATIONALLICENCE 700 1- Roesch Bettina Department of Chemistry, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut NATIONALLICENCE 700 1- McKechnie Jonathan Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut NATIONALLICENCE 700 1- Harrington David Department of Chemistry, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut NATIONALLICENCE 700 1- Djilali Ned Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut NATIONALLICENCE 700 1- Sinton David Department of Mechanical Engineering, Institute for Integrated Energy Systems (IESVic), University of Victoria, Stn CSC, PO Box 3055, V8W 3P6, Victoria, BC, Canada aut NATIONALLICENCE 773 0- Microfluidics and Nanofluidics Springer-Verlag 3/4(2007-08-01), 403-416 1613-4982 3:4<403 2007 3 10404 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer