1. Continuous and Regulated Organic Micro Bubble Generation Using Lumped Gas and Organic Injected Junction
Takahiro Yamamoto, Takahiro Arakawa and Shuichi Shoji.
Major in Nano-science and Nano-engineering, Waseda University
3-4-1, Ohkubo, Shinjuku, Tokyo, , Japan
MEMS Conference 2007
Advisor：Prof. Cheng-Hsien Liu
Reporter：Chao-Ming Chang
Date：

2. Outline Introduction Design and Fabrication Experimental Setup
Result and Discussion
Conclusion

3. Coaxial Microcapillary Fluidic Device
Introduction
Coaxial Microcapillary Fluidic Device
“Monodisperse Double Emulsions Generated from a Microcapillary Device” Ref. A. S. Utada. et. al

4. T-Shaped Microchannel Cross-Shaped Microchannel
Introduction
T-Shaped Microchannel
“RAPID PREPARATION OF MONODISPERSED DROPLETS WlTH CONFLUENT LAMINAR FLOWS” Ref. Takasi Nisisako et. al. 2003
Cross-Shaped Microchannel
Ref. Liqing Ren. et. al

5. Schematic view of the micro bubble generation system
Design and Fabrication
Schematic view of the micro bubble generation system

6. CONCEPT Concept of the micro bubble generation Design and Fabrication
（Butyl Acetate）醋酸丁酯
（Air）
（3% Polyviny Alcohol）聚乙烯醇
Concept of the micro bubble generation

7. Design and Fabrication
Fabrication Process
Pad
Fabrication process of the device

8. Design and Fabrication
Fabrication Result
製程結果的SEM圖，這樣的製程看起來不會太複雜。
SEM image of the fabricated Si microchannel at the junction

9. Schematic of the experimental setup

10. High-speed CCD image of the micro bubble generation
Result and Discussion
High-speed CCD image of the micro bubble generation

11. Experimental results Limited
Result and Discussion
Experimental results
Limited
Image of the micro bubble at observation area
(Organic phase flow rate(Qo)：
2, 1, 0.5 uL/min, Gas：4uL/min, Water：8uL/min)

12. Water phase V.S. Bubble diameter
Result and Discussion
Water phase V.S. Bubble diameter
Bubble diameter V.S. water phase flow rate

13. Bubble pitch V.S. Water phase
Result and Discussion
Bubble pitch V.S. Water phase
Bubble pitch and generation rate V.S. water phase flow rate

14. Conclusion
The diameter of micro bubble, and generation rate were controlled by water phase flow.
The average bubble pitch increased, when water phase flow rate increased.
The organic membrane became thinner when organic phase flow rate decreased.
The organic membrane is expected to be used as a media for high efficiency reaction.

15. Thank you for your listening!