Digital microfluidics depends on efficient movement of individual drops for a variety of tasks, e.g. reagent delivery, mixing, sampling, etc. Superhydrophobic (SH) coatings generally show high repellency and low adhesion for a variety of liquids. Therefore, SH coatings can provide for an efficient drop delivery and hence low energy requirements for a fluidic chip. However, wide application of such coatings is hampered by fragile nature of such coatings to date. A new SH coating is developed that addresses the fragility challenge of such coatings. It is based on application of nanoparticles to fluoropolymers. The mechanical stability, wear resistance and durability under prolonged liquid exposure of this new coating is discussed. It is shown that the new SH coating can maintain high contact angles, low contact angle hysteresis needed for drop mobility under adverse conditions/application of digital microfluidic devices. The developed SH coating can also be sprayed onto various surfaces, including glass used in traditional lab-on-chip (LOC) devices, or even paper for enabling novel Lap-on-paper (LOP) devices.
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ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels
June 19–22, 2011
Edmonton, Alberta, Canada
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4463-2
PROCEEDINGS PAPER
A Robust Superhydrophobic Surface for Digital Microfluidics
David Barona,
David Barona
University of Alberta, Edmonton, AB, Canada
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A. Amirfazli
A. Amirfazli
University of Alberta, Edmonton, AB, Canada
Search for other works by this author on:
David Barona
University of Alberta, Edmonton, AB, Canada
A. Amirfazli
University of Alberta, Edmonton, AB, Canada
Paper No:
ICNMM2011-58159, pp. 135-138; 4 pages
Published Online:
May 11, 2012
Citation
Barona, D, & Amirfazli, A. "A Robust Superhydrophobic Surface for Digital Microfluidics." Proceedings of the ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels, Volume 1. Edmonton, Alberta, Canada. June 19–22, 2011. pp. 135-138. ASME. https://doi.org/10.1115/ICNMM2011-58159
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