In this article, we present a new technique to actuate liquids in microchannels using ground-directed electric discharge generated by a portable corona device. When an electric discharge is applied, the air in the microchannel is ionized causing a change in the surface energy. The resulting change in the contact angle induces rapid liquid transport through the channel by capillary action. In contrast to established plasma treatment this method employs a ground electrode that guides the electric field. This approach enables rapid treatment of select microchannels and thus provides a means of real-time fluid actuation as opposed to simply a pretreatment process. Instantaneous fluid velocities show power-law dependence with time and fit theoretical models at a contact angle of 65°. Average fluid velocities are on the order of 5 cm/s, and thus channels on the order of 1-cm long are filled in ~0.2 s. To demonstrate the potential of this technique for integrated lab-on-a-chip applications, the method was employed in serpentine channel, for on-demand fluid routing, to initiate a mixing process, and through an on-chip integrated microelectrode.
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Adams TM, White AR (2008) Macroscopic conservation equation based model for surface tension driven flow. Adv Fluid Mech Vii 59:133–141
Arifin DR, Yeo LY, Friend JR (2007) Microfluidic blood plasma separation via bulk electrohydrodynamic flows. Biomicrofluidics 1(1):014103–014113
Bittencourt JA (2004) Fundamentals of plasma physics. Springer, New York
Chih-Peng H, Jewell-Larsen NE, Krichtafovitch IA, Montgomery SW, Dibene JT, Mamishev AV (2007) Miniaturization of electrostatic fluid accelerators. J Microelectromech Syst 16(4):809–815
Duffy DC, McDonald JC, Schueller OJA, Whitesides GM (1998) Rapid prototyping of microfluidic systems in poly(dimethylsiloxane). Anal Chem 70(23):4974–4984
Evju JK, Howell PB, Locascio LE, Tarlov MJ, Hickman JJ (2004) Atmospheric pressure microplasmas for modifying sealed microfluidic devices. Appl Phys Lett 84(10):1668–1670
Fair RB (2007) Digital microfluidics: is a true lab-on-a-chip possible? Microfluid Nanofluid 3(3):245–281
Haubert K, Drier T, Beebe D (2006) PDMS bonding by means of a portable, low-cost corona system. Lab Chip 6(12):1548–1549
Hilpert M (2009) Effects of dynamic contact angle on liquid infiltration into horizontal capillary tubes: (Semi)-analytical solutions. J Colloid Interface Sci 337(1):131–137
Hilpert J, Kern J (1974) Electric wind in a corona discharge—theory and measurement. Arch Elektrotech 56(1):50–54
Horiuchi K, Dutta P (2006) Electrokinetic flow control in microfluidic chips using a field-effect transistor. Lab Chip 6(6):714–723
Hsu CP, Jewell-Larsen NE, Krichtafovitch IA, Montgomery SW, Dibene JT, Mamishev AV (2007) Miniaturization of electrostatic fluid accelerators. J Microelectromech Syst 16(4):809–815
Juncker D, Schmid H, Drechsler U, Wolf H, Wolf M, Michel B, de Rooij N, Delamarche E (2002) Autonomous microfluidic capillary system. Anal Chem 74(24):6139–6144
Kim J, Chaudhury MK, Owen MJ (2000) Hydrophobic recovery of polydimethylsiloxane elastomer exposed to partial electrical discharge. J Colloid Interface Sci 226(2):231–236
Kim J, Kido H, Rangel RH, Madou MJ (2008) Passive flow switching valves on a centrifugal microfluidic platform. Sens Actuators B 128(2):613–621
Luk VN, Wheeler AR (2009) A digital microfluidic approach to proteomic sample processing. Anal Chem 81(11):4524–4530
Makamba H, Kim J, Lim K, Park K, Hahn JH (2003) Surface modification of poly(dimethylsiloxane) microchannels. Electrophoresis 24(21):3607–3619
Moreau E (2007) Airflow control by non-thermal plasma actuators. J Phys D 40(3):605–636
Robinson M (1962) A history of electric wind. Am J Phys 30(5):366
Seimandi P, Dufour G, Rogier F (2009) An asymptotic model for steady wire-to-wire corona discharges. Math Comput Model 50(3–4):574–583
Sun C, Zhang D, Wadsworth LC (1999) Corona treatment of polyolefin films—a review. Adv Polym Technol 18(2):171–180
Sung Kwon C, Hyejin M, Chang-Jin K (2003) Creating, transporting, cutting, and merging liquid droplets by electrowetting-based actuation for digital microfluidic circuits. J Microelectromech Syst 12(1):70–80
Thorsen T, Maerkl SJ, Quake SR (2002) Microfluidic large-scale integration. Science 298:580–584
Thorslund S, Nikolajeff F (2007) Instant oxidation of closed microchannels. J Micromech Microeng 17(4):N16–N21
Unger MA, Chou HP, Thorsen T, Scherer A, Quake SR (2000) Monolithic microfabricated valves and pumps by multilayer soft lithography. Science 288:113–116
Washburn EW (1921) The dynamics of capillary flow. Phys Rev 17(3):273
Whitesides GM (2006) The origins and the future of microfluidics. Nature 442(7101):368–373
Whitesides GM, Stroock AD (2001) Flexible methods for microfluidics. Phys Today 54(6):42–48
Yeo LY, Hou D, Maheshswari S, Chang HC (2006) Electrohydrodynamic surface microvortices for mixing and particle trapping. Appl Phys Lett 88(23):233512
Zenkiewicz M (2005) Oxidation of the filled-polyolefin-film surface layer by corona treatment. Przem Chem 84(10):733–739
The authors would like to acknowledge funding from the Canada Research Chairs Program as well as a scholarship to CE and a research grant to DS from the Natural Science and Engineering Council of Canada (NSERC). Infrastructure funding from the Canadian Foundation for Innovation is also gratefully acknowledged. The authors would also acknowledge helpful discussions with Te-Chun Wu.
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Escobedo, C., Sinton, D. Microfluidic liquid actuation through ground-directed electric discharge. Microfluid Nanofluid 11, 653–662 (2011). https://doi.org/10.1007/s10404-011-0831-4
- Electric discharge
- Contact angle
- Capillary flow
- Surface tension
- Microfluidic liquid actuation