期刊
APPLIED PHYSICS LETTERS
卷 97, 期 16, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3502601
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资金
- National Science Council of Taiwan
Electro-osmosis is the preferred transport mechanism in microfluidic systems. The electro-osmotic mobility in an aqueous solution is essentially independent of the microchannel size. However, in low-permittivity solvents, the screening effect is absent and the mobility is found to grow with the capillary radius according to our analytical theory and electro-osmotic flow experiments. Our results show that regardless of low surface charge density, electro-osmosis always occurs for long enough microchannels. Therefore, electro-osmosis provides a method for determining extremely low surface charge density associated with low-permittivity media. The implication in the response time of electronic paper is given as well. (C) 2010 American Institute of Physics. [doi:10.1063/1.3502601]
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