THE EFFECTS OF ELECTRODE’S SIZE AND SHAPE ON THE EFFICIENCY OF A 3D ELECTRO-OSMOSIS COLLECTION CHIP

• Main Authors: You-Zong Shih, 施佑宗
• Other Authors: Chehung Wei
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/96943846186651447053

碩士 === 大同大學 === 機械工程學系(所) === 97 === 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.