期刊
SENSORS
卷 15, 期 2, 页码 2694-2708出版社
MDPI AG
DOI: 10.3390/s150202694
关键词
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资金
- Norsk regional kvalifiseringsstotte fra Oslofjorfondet (Touchsensorfor enklere og raskere urinpr(l)vetaking og analyse) [234972]
- NFR og VRI Vestfold (olymerbasert optisk system integrerbar pa mikrofluidiske anordninger for deteksjon av vannbarne patogener) [241684]
Microfluidic two-phase flow detection has attracted plenty of interest in various areas of biology, medicine and chemistry. This work presents a capacitive sensor using insulated interdigital electrodes (IDEs) to detect the presence of droplets in a microchannel. This droplet sensor is composed of a glass substrate, patterned gold electrodes and an insulation layer. A polydimethylsiloxane (PDMS) cover bonded to the multilayered structure forms a microchannel. Capacitance variation induced by the droplet passage was thoroughly investigated with both simulation and experimental work. Olive oil and deionized water were employed as the working fluids in the experiments to demonstrate the droplet sensor. The results show a good sensitivity of the droplet with the appropriate measurement connection. This capacitive droplet sensor is promising to be integrated into a lab-on-chip device for in situ monitoring/counting of droplets or bubbles.
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