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Manipulation and Simulation of Droplets Based on Electrowetting on Dielectric

Author: ZengXueFeng
Tutor: YueRuiFeng
School: Tsinghua University
Course: Electronic Science and Technology
Keywords: Microfluidic chip system Droplet manipulation Electrowetting media Hydrophobic A fluorocarbon polymer
CLC: TP273
Type: Master's thesis
Year: 2005
Downloads: 341
Quote: 3
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Abstract


Due to the enormous potential of the microfluidic chip integration, automation, efficiency and portability so, has become an important direction for the development of analytical instruments and research frontiers. Transport of microliter, nanoliter liquid capacity within the separation and mixed manipulation and control is the basis for the development of microfluidic chip system, is also one of the focus of the most challenging international. And other drive, so far only the media electrowetting devices on the same chip realize droplet transport, production, separation and mixing the integration and automation of manipulation digitize microfluidic chip system laid a solid foundation. Electrowetting effect on the media-based microfluidic chip zoom microlens tunable fiber optics \. This paper, we have designed, fabricated and tested the electrowetting device based on the media. First, the theory of the electro-wetting on the medium, the contact angle of the basis of the concept of saturation, and surface damping medium electrowetting device of the two-dimensional physical model of the \drops of transport and impact factors. Secondly, the use of the model combined with computational fluid dynamics software CFD-ACE successfully simulated the transport of the droplets in the three-dimensional devices, resulting in separation, and the whole process of the merger, and plate spacing and droplet transport speed a linear relationship. The simulation results and a two-dimensional model and the experimental result is consistent. Again, try to use metal-Si 3 N 4 and polycrystalline silicon - silicon oxide Both devices structure on the media to make electrowetting devices. To prepare cotype cheap hydrophobic film prepared by ICP-CVD deposition of fluorocarbon polymer film deposition conditions on film composition and chemical bonding structure and optimized deposition conditions . The results show that the deionized water and a film between the static contact angle of up to 112O. The same time, we dumped glue method prepared by Dupont Teflon ? AF1600, it is now the best commercial hydrophobic material. Pointed out the direction and its comparison for further improvements to improve the performance of the fluorocarbon polymer. Finally, through the study of the basic theory and process, we designed a media electrowetting devices territory, and developed its own set of peripheral control circuit device tester. By repeatedly running water, produced media on electrowetting device. Under a voltage of 35 V and 45 V, respectively, in the silicone oil and the air environment to successfully achieve droplet generation and drive.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system
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