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An integrated electronic meniscus sensor for measurement of evaporative flow

Gazzola, D and Iafelice, B and Jung, E and Scarselli, E. Franchi and Guerrieri, R (2008) An integrated electronic meniscus sensor for measurement of evaporative flow. Sensors and Actuators A: Physical, 145-146 . 194 - 200.

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Official URL: http://www.sciencedirect.com/science/article/B6THG...

Abstract

This paper presents an electronic sensor of the meniscus height at the outlet of an open micro-well. It is shown that it can be used to compute the average velocity of the flow induced by evaporation. The sensor is built using a technology for bio-medical micro-devices based on Printed Circuit Board (PCB) manufacturing to allow future integration of it in biochips composed of large arrays of microfluidic channels for parallel bioassays. The sensor consists of two aluminium electrodes located at the top of the micro-well and used to measure the impedance between them. A correlation between the impedance and the meniscus height h is demonstrated. A second correlation between h and the rate of the evaporative flow ER is investigated through optical inspection at different temperatures. Combining these two results we obtained average flow rates from 0.5 to 1 μm/s at room temperature and 33% relative humidity. Such a sensor could find an application in open microfluidics systems where the flow induced by evaporation counteracts the gravitational fall of particles of biological interest.

Item Type:Article
Additional Information:Special Issue: Transducers/07 Eurosensors XXI, The 14th International Conference on Solid State Sensors, Actuators and Microsystems and the 21st European Conference on Solid-State Transducers, The 14th International Conference on Solid State Sensors, Actuators and Microsystems and the 21st European Conference on Solid-State Transducers
Uncontrolled Keywords:Microfluidics; Lab on a chip; Evaporation; Aluminium PCB
Subjects:Analytical Science > Nanotechnology for sensing and actuating
ID Code:4931
Deposited By:SPI
Deposited On:09 Apr 2009 13:25
Last Modified:09 Apr 2009 13:25

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