Time-multiplexed droplet manipulation via vibrating ratcheted micro-channels

IEEE MEMS(2007) 503-506Zhenwen Ding, Woo-Bin Song,Babak ZiaiePurdue University, USA

姓名 : 陳立仁

學號 :9635517

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Outline

Introduction Channel design and fabrication Experiment setup Result Conclusion

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Introduction The ability to control the dynamics of liq

uid droplets has become crucial in many bioMEMS applications such as lab-on-a-chip and micro-total analysis systems.

Droplets can be moved through an imbalance of surface tension forces ,electrowetting or dielectrophoresis.

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Introduction (cont.)

This paper reports a new and simple technique for time-multiplexed manipulation (transport and mixing)

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Channel design and fabrication

α: the narrowest part of the channel width

β: ratchet depth

γ: ratchet length

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Channel design and fabrication (cont.)

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Channel design and fabrication (cont.)

(a)

(c) (d)

(b)

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Experiment setup

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Result

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Result (cont.)

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Result (cont.)

Vibration direction

20°

60°

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Result (cont.)

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Result (cont.)

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Conclusion

A maximum droplet moving speed of 100mm/s was achieved with a vibration frequency and amplitude of 50Hz and 3.5mm.

Although in the same fluidic channel, droplets with different volume may move in different velocity. (friction)

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