本論文提出一具多方向性排氣能力之微型液氣分離器設計，並以微積電製程製作，本設計主要包括一上面佈滿斥水性孔洞之反應槽，以及相間排列的寬窄流道，其中寬流道及其內的排氣孔為斥水性，而窄流道為親水性，以利用毛細現象將液體回收，本設計被成功的製作完成並逹成多方向性排氣，及回收液體之要求．該液氣分離器可應用於處理微型直接甲醇燃料電池陽極副產物（CO2 bubbles)之排除，或任何需要排除氣泡之系統．

A micro bubble separator capable of multi-directional bubble exhaustion is designed, fabricated, and tested. The bubble separator fabricated on a piece of water using MEMS fabrication process includes a flat region and a microchannel region. In the flat region, there are a matrix of micro holes with hydrophobic inner surface. The microchannel region contains a set of alternating gas and liquid microchannels. Within the gas microchannels, the microholes is further made. The liquid microchannels are hydrophilic, while the gas microchannels, and the micro hole therein are hydrophobic. This bubble separator was experimentally demonstrated to exhale bubbles in multiple directions successfully with fuel recycle capability. Such bubble separators are suitable to deal with the CO2 bubbles generated at the anode of a micro direct methanol fuel cell (µDMFC).

[1] http://americanhistory.si.edu/csr/fuelcells/
[2] P. Argyropoulos, K. scott, and W.M. Taama, “Carbon dioxide evolution patterns in direct methanol fuel cells”, Electrochimica Acta 44, pp. 3575-3584, 1999
[3] Luft, et al. US Patent, Patent No. 6,509,112 B1
[4] W. Preidel, Erlangen (DE) US Patent, Patent No. 20030145730 A1
[5] W. Herdeg, et al. US Patent, Patent No. 6,403,243
[6] J.-H. Tsai and L. Lin, “Active microfluidic mixer and gas bubble filter driven by thermal bubble micropump”, Sensors and Actuators, A97-98, pp. 665-671, 2002.
[7] D.-S. Meng, J. Kim, and C.J. Kim, “A distributed gas breather for micro direct methanol fuel cell” Proc. IEEE Int. Conf. Micro Electro Mechanical System (MEMS 2003), Kyoto, Japan, pp. 534-537, 2003.
[8] D-S. Meng, T. Cubaud, C. M. Ho, and C.J. Kim, “A membrane breather for micro fuel cell with high concentration methanol”, Solid-State Sensor, Actuator and Microsystems Workshop Hilton Head Island, South, Carolina, June 6-10, 2004.
[9] http://www.ices.cmu.edu/amon/Projects/Summaries/micro_power.html
[10] S.-C. Yao, private communication, 2003.
[11] D.J. Yao, private communication, 2004.
[12] M. M. Mench, S. Boslet, S. Thynell, J. Scott, and C.Y. Wang, "Experimental study of a direct methanol fuel cell", in Proc. of the symposium on direct methanol fuel cells, the 199th Electrochemical Society Proceedings Series, Princeton, NJ, 2001.
[13] D. Kim, E.A. Cho, S.A. Hong, I.H. O,and Y. Ha, “Recent progress in passive direct methanol fuel cells at KIST”, Journal of Power Sources, pp. 172-177, 2004.
[14] G. Gamow, and J. M. Cleveland, Physics, 2nd, pp. 362~pp367, 1969
[15] http://hyperphysics.phy-astr.gsu.edu/hbase/surten.html
[16] 吳友仁編, 物理基礎觀念第二冊, 東江圖書公司印行, pp. 134-137, pp. 147-148, 1991.
[17] http://www3.interscience.wiley.com:8100/legacy/college/cutnell/04711518
31/ste/ste.pdf
[18] D. S. Kim, K. C. Lee, T. H. Kwon, and S.S. Lee, “Micro-channel filling flow considering surface tension effect”, Journal of Micromechanics and Microengineering, pp. 236-246, 2002.