Abstract
We report a novel oscillatory behavior of a sessile droplet on a hydrophobic surface. The droplet was placed on an electrode with a hydrophobic surface and close to, but not touching, a second needle-like electrode. The change in the contact angle was observed only when the droplet oscillated. In a traditional electro-wetting experiment, however, the contact angle decreased immediately when an alternating current electric field was applied. In addition, the non-contact mode gave rise to a true sessile condition of the droplet, whose oscillation amplitude was not linearly proportional to the driving voltage but reached a maximum value.
Article PDF
Similar content being viewed by others
Explore related subjects
Find the latest articles, discoveries, and news in related topics.Avoid common mistakes on your manuscript.
References
He K J, Cheng H, Zhu Y Y, et al. Study on conductance of super-saturated chloride microdroplets. Sci China Ser B-Chem, 2009, 52: 879–886
Chen X L, Lu T. The apparent state of droplets on a rough surface. Sci China Ser G-Phys Mech Astron, 2009, 52: 233–238
Yang C W, He F, Hao P F. The apparent contact angle of water droplet on the micro-structured hydrophobic surface. Sci China Chem, 2010, 53: 912–916
Egry I, Giffard H, Schneider S. The oscillation drop technique revisited. Meas Sci Tech, 2005, 16: 426–431
Yamakita S, Matsui Y, Shiokawa S. New method for measurement of contact angle (droplet free vibration frequency method). Jpn J Appl Phys, 1999, 38: 3127–3130
Mugele F, Baret J C, Steinhauser D. Microfluidic mixing through electrowetting-induced droplet oscillations. Appl Phys Lett, 2006, 88: 204106
Ko S H, Lee H, Kang K H. Hydrodynamic flows in electrowetting. Langmuir, 2008, 24: 1094–1101
Abdelgawad M, Wheeler A R. The digital revolution: A new paradigm for microfluidics. Adv Mater, 2008, 20: 1–6
Gabay C, Berge B, Dovillaire G, et al. Dynamic study of a Varioptic variable focal lens. Proc SPIE, 2002, 4767: 159–165
Hayes R A, Feenstra B J. Video-speed electronic paper based on electrowetting. Nature, 2003, 425: 383–385
Rayleigh L. On the capillary phenomena of jets. Proc R Soc London, 1879, 29: 71–97
Lamb H. Hydrodynamics. 6th ed. Cambridge: Cambridge University Press, 1932. 473
Strani M, Sabetta F. Free vibrations of a drop in partial contact with a solid support. J Fluid Mech, 1984, 141: 233–247
Lyubimov D V, Lyubimova T P, Shklyaev S V. Behavior of a drop on an oscillating solid plate. Phys Fluids, 2006, 18: 012101
Rhim W K, Ohsaka K, Paradis P F, et al. Noncontact technique for measuring surface tension and viscosity of molten materials using high temperature electrostatic levitation. Rev Sci Instrum, 1999, 70: 2796–2801
Noblin X, Buguin A, Brochard-Wyart F. Vibrations of sessile drops. Eur Phys J, 2009, 166: 7–10
Bormashenko E, Pogreb R, Stein T, et al. Electrostatically driven droplets deposited on superhydrophobic surfaces. Appl Phys Lett, 2009, 95: 264102
Takeda K, Nakajima A, Hashimoto K, et al. Jump of water droplet from a super-hydrophobic film by vertical electric field. Surf Sci, 2009, 519: 589–592
Scott T C, Basaran O A, Byers C H. Characteristics of electric-filed-induced oscillation of translating liquid droplets. Ind Eng Chem Res, 1990, 29: 901–909
Trinh E H, Holt R G, Thiessen D B. The dynamics of ultrasonically levitated drops in an electric field. Phys Fluids, 1996, 8: 43–61
Klingner A, Herminghaus S, Mugele F. Self-excited oscillatory dynamics of capillary bridges in electric fields. Appl Phys Lett, 2003, 82: 4187–4189
Lai M F, Lee C P, Liao C N, et al. Oscillation spectrums and beat phenomenon of a water droplet driven by electrowetting. Appl Phys Lett, 2009, 94: 154102
Ko S H, Lee S J, Kang K H. A synthetic jet produced by electrowetting-driven bubble oscillations in aqueous solution. Appl Phys Lett, 2009, 94: 194102
Oh J M, Ko S H, Kang K H. Shape oscillation of a drop in ac electrowetting. Langmuir, 2008, 24: 8379–8386
Author information
Authors and Affiliations
Corresponding author
Additional information
This article is published with open access at Springerlink.com
Rights and permissions
This article is published under an open access license. Please check the 'Copyright Information' section either on this page or in the PDF for details of this license and what re-use is permitted. If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and re-use information, please contact the Rights and Permissions team.
About this article
Cite this article
Jiang, C., Shi, L., Zhou, P. et al. Electric field-induced oscillation of sessile droplets. Chin. Sci. Bull. 56, 3082 (2011). https://doi.org/10.1007/s11434-011-4688-4
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s11434-011-4688-4