Abstract
A bubble-assisted electroosmotic (EO) micropump is proposed as a miniaturized actuating element to be integrated in a microfluidic chemical sensing system. In this device, a bubble is generated in a narrow channel to form a thin water sheet between the bubble and the wall. Due to the high surface-to-volume ratio of the water sheet, an efficient EO flow is realized at relatively low pumping voltages of 20–60 V without using a porous material. The direction and the flow rate of the EO flow depended on the polarity and the magnitude of the pumping voltage, and the highest flow rate of about ±500 pL/s was obtained at ±60 V. A bubble-assisted EO micropump was combined with a LAPS for measuring the pH value of a droplet with a volume of 1 nL.
Original language | English |
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Pages (from-to) | 993-997 |
Number of pages | 5 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 248 |
DOIs | |
Publication status | Published - 2017 Jan 1 |
Keywords
- Droplet
- Electroosmotic micropump
- Light-addressable potentiometric sensor
- Microfluidics
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry