Droplet-on-a-wristband: Chip-to-chip digital microfluidic interfaces between replaceable and flexible electrowetting modules

Shih Kang Fan*, Hanping Yang, Wen-Syang Hsu

*Corresponding author for this work

Research output: Contribution to journalArticle

42 Scopus citations

Abstract

We present a long (204 mm), curved (curvature of 0.04 mm-1), and closed droplet pathway in "droplet-on-a-wristband" (DOW) with the designed digital microfluidic modular interfaces for electric signal and droplet connections based on the study of electrowetting-on-dielectric (EWOD) in inclined and curved devices. Instead of using sealed and leakage-proof pipes to transmit liquid and pumping pressure, the demonstrated modular interface for electrowetting-driven digital microfluidics provides simply electric and fluidic connections between two adjacent parallel-plate modules which are easy-to-attach/detach, showing the advantages of using droplets for microfluidic connections between modules. With the previously reported digital-to-channel interfaces (Abdelgawad et al., Lab Chip, 2009, 9, 1046-1051), the chip-to-chip interface presented here would be further applied to continuous microfluidics. Droplet pumping across a single top plate gap and through a modular interface with two gaps between overlapping plates are investigated. To ensure the droplet transportation in the DOW, we actuate droplets against gravity in an inclined or curved device fabricated on flexible PET substrates prepared by a special razor blade cutter and low temperature processes. Pumping a 2.5 μl droplet at a speed above 105 mm s-1 is achieved by sequentially switching the entire 136 driving electrodes (1.5 mm × 1.5 mm) along the four flexible modules of the DOW fabricated by 4-inch wafer facilities.

Original languageEnglish
Pages (from-to)343-347
Number of pages5
JournalLab on a Chip
Volume11
Issue number2
DOIs
StatePublished - 21 Jan 2011

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