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URN etd-0724109-163742 Statistics This thesis had been viewed 2666 times. Download 1627 times. Author You-Zong Shih Author's Email Address No Public. Department Mechanical Engineering Year 2008 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 81 Title THE EFFECTS OF ELECTRODE’S SIZE AND SHAPE ON THE EFFICIENCY OF A 3D ELECTRO-OSMOSIS COLLECTION CHIP Keyword electro-osmosis electro-osmosis Abstract The electroosmosis behavior is studied on a 3D microfluidic chip. The 3D electroosmosis chip is made of a collection chamber covered with two electrodes. The top electrode was made of indium tin oxide (ITO) and the bottom electrode was fabricated by sputtering chromium on Corning 1737 glass. The amine-modified polystyrene particles whose average size is 1-3 μm were used for experiments. The chamber size defined by photolithography varies from 100 to 1000 μm. The chamber size, shape, particle size and applied frequency effects on the accumulation efficiency were studied by numerical simulations and experiments.
The results show the electroosmosis is driven by the tangential electric field whose magnitude is affected by chamber size as well as applied frequency. As the chamber size decreases, the magnitude of the tangential electric field increases and affects the efficiency. The collection efficiency is affected by the applied frequency, and chamber size. The different shape of the chamber will have different collection pattern but has similar efficiency. These results are the coupling effects of electric field and flow field which is frequency dependent. These results provide a better understanding for the electroosmosis phenomenon which can be used to design an optimal electroosmosis collection chip for variable size sample.
Advisor Committee Chehung Wei - advisor
Files Date of Defense 2009-07-14 Date of Submission 2009-07-27