Abstract
Micro fluid devices using micro bubbles have attracted much attention for their special advantages. In many cases, the bubbles must be constrained to a certain position so as to grow or shrink under control. In this paper, we discuss the effect of step-shape structures in constraining bubbles against the surface force, which plays a dominant role on the micro scale. We fabricate specimens with a step and electrodes and carry out electrolysis experiments in water to observe bubble growth. We observe the constraining effect of steps as well as failure phenomena. Based on numerical simulations and theoretical analysis, we introduce the critical failure bubble volume and present the analytic solution in a 2-D model. Using step-shape structures is an easy method of constraining bubbles within the critical failure volume..
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References
Zhang K, Jian A Q, Zhang X M, et al. Laser-induced thermal bubbles for microfluidic applications. Lab Chip, 2011, 11: 1389–1395
Ateya D A, Shah A A, Hua S Z. An electrolytically actuated micropump. Rev Sci Instrum, 2004, 75: 915–920
Ryu K, Chung S K, Cho S K. Micropumping by an acoustically excited oscillating bubble for automated implantable microfluidic devices. J Assoc Lab Automat, 2010, 15: 163–171
Chiu S H, Liu C H. An air-bubble-actuated micropump for on-chip blood transportation. Lab Chip, 2009, 9: 1524–1533
Tsou C, Huang C. Thermal bubble microfluidic gate based on SOI wafer. J MEMS, 2009, 18: 852–859
Son S U, Lee S S. Microfocusing using the thermal actuation of microbubbles. Microfluid Nanofluid, 2009, 6: 77–84
Mao X, Juluri B K, Lapsley M I, et al. Milliseconds microfluidic chaotic bubble mixer. Microfluid Nanofluid, 2010, 8: 139–144
Ahmed D, Mao X, Juluri B K, et al. A fast microfluidic mixer based on acoustically driven sidewall-trapped microbubbles. Microfluid Nanofluid, 2009, 7: 727–731
Ahmed D, Mao X, Shi J, et al. A millisecond micromixer via single-bubble-based acoustic streaming. Lab Chip, 2009, 9: 2738–2741
Kato H, Yamaguchi M. Enhancement of mixing by microbubble emission boiling in a microfluidic device. J Visualiz, 2009, 12: 267–274
Chan S C, Chen C R, Liu C H. A bubble-activated micropump with high-frequency flow reversal. Sens Actuators A, 2010, 163: 501–509
Liao K M, Chen R, Chou B C S. A novel thermal-bubble-based micromachined accelerometer. Sens Actuators A, 2006, 130: 282–289
Liao K M, Chen R. Novel two-dimensional micromachined accelerometer based on thermocapillary heat transfer. J Micro/Nanolith MEMS MOEMS, 2008, 7: 033011
Kang E, Lee D H, Kim C B, et al. A hemispherical microfluidic channel for the trapping and passive dissipation of microbubbles. J Micromech Microeng, 2010, 20: 045009
Gau H, Herminghaus S, Lenz P, et al. Liquid morphologies on structured surfaces: From microchannels to microchips. Science, 1999, 283: 46–49
Zhao B, Moore J S, Beebe D J. Surface-directed liquid flow inside microchannels. Science, 2001, 291: 1023–1026
Ling W Y L, Ng T W, Neild A. Effect of an encapsulated bubble in inhibiting droplet sliding. Langmuir, 2010, 26: 17695–17702
Hirt C W, Nichols B D. Volume of fluid (VOF) method for the dynamics of free boundaries. J Comput Phys, 1981, 39: 201–225
Brackbill J U, Kothe D B, Zemach C. A continuum method for modeling surface tension. J Comput Phys, 1992, 100: 335–354
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Zhu, X., Huang, W. & Li, Y. Role of step-shape structures and critical failure bubble volume in micro bubble constraint. Chin. Sci. Bull. 57, 2941–2946 (2012). https://doi.org/10.1007/s11434-012-5251-7
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DOI: https://doi.org/10.1007/s11434-012-5251-7