Abstract
The interactions between water droplets and elastic films were examined by acquiring droplet and PDMS film images using a high-speed visualization technique. The contact angle with a water droplet and the deflection of a PDMS thin polymer film were measured from the images and compared with the values calculated from modified cantilever theory. The contact angle and deflection of the PDMS thin plate increased with increasing droplet volume. The static behavior of the elasto-capillarity effect was confirmed by theory and experiment. The dynamic behavior of an elastic film was also examined using the AC electro-wetting condition. The elastic polymer with a droplet was vibrating at double the frequency of the excited AC frequency. The amplitude of vibration increased with increasing AC voltage. These results can be used to design practical microactuators.
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References
Bico J, Roman B, Moulin L, Boudaoud A (2004) Elasto capillary coalescence in wet hair. Nature 432:690
Boncheva M, Bruzewicz DA, White sides GM (2003) Millimeter-scale self-assembly and its applications. Pure Appl Chem 75:621–630
de Langre E, Baroud CN, Reverdy P (2010) Energy criteria for elasto-capillary wrapping. J Fluids Struct 26:205–217
Hu DL, Chan B, Bush JWM (2003) The hydrodynamics of water strider locomotion. Nature 424:663–666
Kim H-Y, Mahadevan L (2006) Capillary rise between elastic sheets. J Fluid Mech 548:141–150
Leong TG, Gu ZY, Koh TL, Gracias DH (2006) Spatially controlled chemistry using remotely guided nanoliter scale containers. J Am Chem Soc 128:11336–11337
Leong TG, Lester PA, Koh TL, Call EK, Gracias DH (2007) Surface tension-driven self-folding polyhedral. Langmuir 23:8747–8751
Mastrangelo CH, Hsu CH (1993) Mechanical stability and adhesion of microstructures under capillary forces -Part II: experiments. J Microelectromech Syst 2:33–55
Py C, Reverdy P, Doppler L, Bico J, Roman B, Baroud CN (2007) Capillary origami: spontaneous wrapping of a droplet with an elastic sheet. Phys Rev Lett 98:156103
Py C, Reverdy P, Doppler L, Bico J, Roman B, Baroud CN (2009) Capillarity induced folding of elastic sheets. Eur Phys J Spec Top 166:67–71
Syms RRA, Yeatman EM, Bright VM, Whitesides GM (2003) Surface tension-powered self-assembly of micro structures—the state-of-the-art. J Microelectromech Syst 12:387–417
Wang Z Q, Wang F-C, Zhao Y-P (2012) Tap dance of a water droplet, Proceedings of the Royal Society a-Mathematical Physical and Engineering Sciences, 468:2485–2495
Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2012R1A2A4A01008749, and No. 2012K2A1A2033138). This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) through GCRC-SOP (No. 2011-0030663).
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Kim, D.Y., Yi, S.J. & Kim, K.C. Visualization study on the interactions between water droplet and elastic film. J Vis 17, 89–99 (2014). https://doi.org/10.1007/s12650-014-0195-4
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DOI: https://doi.org/10.1007/s12650-014-0195-4