SPLIT AND RECOMBINATION MICROMIXER BASED ON PDMS THREE-DIMENSIONAL MICRO STRUCTURE Seok Woo Lee, Dong Sung Kim , Seung S. Lee , and Tai Hun Kwon Korea Advanced Institute of Science and Technology, Pohang University of Science and Technology TRANSDUCERS’05 Reporter:宋建緯 2007/6/20

Outline Introduction Concept and Design Fabrication Experiment Conclusion

Introduction Mixing in laminar flow molecular diffusion stretching and folding

Introduction Active miromixer Passive micromixer Reduce the mixing length External energy Passive micromixer No external energy Low cost Lower mixing efficiency than active micromixers

Concept and Design Split and Recombination Interfaces are increased to 2^(n+1)-1

Fabrication Lower layer Upper layer

Experiment result-1 NaOH&1%phenolphthalein water solution Interface

Experiment result-2 Quantify the mixing efficiency

Mixing efficiency

Conclusion Increases interfaces exponentially 2^(n+1)-1 Problems in alignment

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