TY - JOUR
T1 - Multiplexed electrical sensor arrays in microfluidic networks
AU - Cole, Matthew C.
AU - Kenis, Paul J.A.
N1 - Funding Information:
We would like to acknowledge Jim Wentz from the UIUC School of Chemical Sciences Electronics Shop for help with the design and construction of the power supply used in this study, and also undergraduate student Alexander Kniuksta for his preliminary work characterizing the individual resistive sensors. This work was supported by the National Science Foundation under Award DMI-0328162; an NSF NSEC on Nanomanufacturing.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2009
Y1 - 2009
N2 - A major limitation of many microfluidic platforms is their inability to perform large scale, real time, sensing, routing, or scheduling of the materials moving through them. This paper seeks to address the first of these deficiencies by introducing a multiplexed sensing architecture capable of monitoring the movement of liquid droplets in large microfluidic networks.We describe the design and fabrication of the sensor array, aswell as its integration and testing in microfluidic networks. Individual sensors consisting of small electrical components (resistors, capacitors, or conduction gaps) are addressed using a multiplexing approach that allows an array of m×n sensors to be supported by only m+ n + 1 electrical contacts, as compared to the 2×m×n contacts traditionally necessary. For example, a multiplexed 10×10 array of sensors can be operated with 21 contacts, as opposed to the 200 contacts needed in a traditional configuration. The multiplexing relies on the fact that each sensing element is connected to two electrical leads, and each electrical lead is connected to multiple sensing elements. Here we show the principle using a 4×4 multiplexed arrays of resistive and capacitive sensors to monitor the passage of discrete liquid plugs through a microfluidic network.
AB - A major limitation of many microfluidic platforms is their inability to perform large scale, real time, sensing, routing, or scheduling of the materials moving through them. This paper seeks to address the first of these deficiencies by introducing a multiplexed sensing architecture capable of monitoring the movement of liquid droplets in large microfluidic networks.We describe the design and fabrication of the sensor array, aswell as its integration and testing in microfluidic networks. Individual sensors consisting of small electrical components (resistors, capacitors, or conduction gaps) are addressed using a multiplexing approach that allows an array of m×n sensors to be supported by only m+ n + 1 electrical contacts, as compared to the 2×m×n contacts traditionally necessary. For example, a multiplexed 10×10 array of sensors can be operated with 21 contacts, as opposed to the 200 contacts needed in a traditional configuration. The multiplexing relies on the fact that each sensing element is connected to two electrical leads, and each electrical lead is connected to multiple sensing elements. Here we show the principle using a 4×4 multiplexed arrays of resistive and capacitive sensors to monitor the passage of discrete liquid plugs through a microfluidic network.
KW - Electrical sensors
KW - Microfluidic sensing
KW - Multiplexing
KW - Sensor arrays
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U2 - 10.1016/j.snb.2008.12.010
DO - 10.1016/j.snb.2008.12.010
M3 - Article
AN - SCOPUS:77954325269
VL - 136
SP - 350
EP - 358
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
SN - 0925-4005
IS - 2
ER -