Time-multiplexed droplet manipulation via vibrating ratcheted micro-channels IEEE MEMS(2007) Zhenwen Ding, Woo-Bin Song,Babak Ziaie Purdue University, USA 姓名 : 陳立仁 學號 :

1 Outline  Introduction  Channel design and fabrication  Experiment setup  Result  Conclusion

2 Introduction  The ability to control the dynamics of liquid 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.

3 Introduction (cont.)  This paper reports a new and simple technique for time-multiplexed manipulation (transport and mixing)

4 Channel design and fabrication α: the narrowest part of the channel width β: ratchet depth γ: ratchet length

5 Channel design and fabrication (cont.)

6 (a) (c)(d) (b)

7 Experiment setup

8 Result

9 Result (cont.)

10 Result (cont.) Vibration direction 20°60°

11 Result (cont.)

12 Result (cont.)

13 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)

14  Thanks for your attendance !