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楊涵評 (Hanping Yang)
楊涵評 (Hanping Yang)
Handling Microliquid by Polar Capillary
Handling Microliquid by Polar Capillary
以極化毛細管操控微量流體的研究
以極化毛細管操控微量流體的研究
Due to the demand on microfluidic handling, the surface tension in microchannel has attracted lots of attention recently. For controlling surface tension in microchannel, two major ways were reported, thermocapillary (Marangoni effect) and electrocapillary (electrowetting) methods. Here, a new surface tension controlling method by polarization of liquid in the microchannel is proposed, it is called polar capillary effect. The proposed method can change the solid-liquid interface at electrodes from hydrophobic to hydrophilic characteristic. In order to verify the feasibility, several microchannels with electrodes are designed and fabricated. One of sealed microchannels is fabricated and tested successfully. It is found that the liquid (DI water) in the capillary is motionless with input voltage under 2 volts. While the voltage is raised to 3 volt, the liquid flows smoothly in microchannel with the velocity of 69-μm/min. Besides the polar capillary effect, the capillary effect is also tested to identify the key factors within it, that help with the improved design of polar capillary in the future.
Due to the demand on microfluidic handling, the surface tension in microchannel has attracted lots of attention recently. For controlling surface tension in microchannel, two major ways were reported, thermocapillary (Marangoni effect) and electrocapillary (electrowetting) methods. Here, a new surface tension controlling method by polarization of liquid in the microchannel is proposed, it is called polar capillary effect. The proposed method can change the solid-liquid interface at electrodes from hydrophobic to hydrophilic characteristic. In order to verify the feasibility, several microchannels with electrodes are designed and fabricated. One of sealed microchannels is fabricated and tested successfully. It is found that the liquid (DI water) in the capillary is motionless with input voltage under 2 volts. While the voltage is raised to 3 volt, the liquid flows smoothly in microchannel with the velocity of 69-μm/min. Besides the polar capillary effect, the capillary effect is also tested to identify the key factors within it, that help with the improved design of polar capillary in the future.
[1] H. Yang and W. Hsu (July 2002). Feasibility Study of Microfluidic Handling by Polar Capillary Effect, Pacific Rim Workshop on Transducers and Micro/Nano Technologies, Xiamen, China.
[1] H. Yang and W. Hsu (July 2002). Feasibility Study of Microfluidic Handling by Polar Capillary Effect, Pacific Rim Workshop on Transducers and Micro/Nano Technologies, Xiamen, China.
[2] H. Yang, S.-K. Fan, and W. Hsu (November 2005). 3D Droplet Transportation by EWOD Actuations on Flexible Polymer Films, ASME 2005 International Mechanical Engineering Congress and Exposition, Orlando, U.S.A.
[2] H. Yang, S.-K. Fan, and W. Hsu (November 2005). 3D Droplet Transportation by EWOD Actuations on Flexible Polymer Films, ASME 2005 International Mechanical Engineering Congress and Exposition, Orlando, U.S.A.
[3] S.-K. Fan, H. Yang, T.-T. Wang, and W. Hsu, "Asymmetric Electrowetting - Moving Droplets by a Square Wave." Lab on a Chip 2007, 7, 1330-1335.
[3] S.-K. Fan, H. Yang, T.-T. Wang, and W. Hsu, "Asymmetric Electrowetting - Moving Droplets by a Square Wave." Lab on a Chip 2007, 7, 1330-1335.
[4] H. Yang, S.-K. Fan, and W. Hsu (January 2008). Connecting interface for modularization of digital microfluidics, SPIE Symposium on MOEMS-MEMS, San Jose, U.S.A..
[4] H. Yang, S.-K. Fan, and W. Hsu (January 2008). Connecting interface for modularization of digital microfluidics, SPIE Symposium on MOEMS-MEMS, San Jose, U.S.A..
[5] H. Yang, W. Hsu, and S.-K. Fan (January 2008). Wristand-like droplet platform by digital microfluidic modulation, The 21th IEEE International Conference on Micro Electro Mechanical Systems, Tucson, U.S.A..
[5] H. Yang, W. Hsu, and S.-K. Fan (January 2008). Wristand-like droplet platform by digital microfluidic modulation, The 21th IEEE International Conference on Micro Electro Mechanical Systems, Tucson, U.S.A..
[6] S.-K. Fan, H. Yang and W. Hsu, “Droplet-on-a-Wristband: Chip-to-Chip Digital Microfluidic Interfacesbetween Replaceable and Flexible Electrowetting Modules.” Lab on a Chip 2011, 11, 343–347.
[6] S.-K. Fan, H. Yang and W. Hsu, “Droplet-on-a-Wristband: Chip-to-Chip Digital Microfluidic Interfacesbetween Replaceable and Flexible Electrowetting Modules.” Lab on a Chip 2011, 11, 343–347.
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