Size-dependent electro-osmosis in a microchannel with low-permittivity, salt-free media

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Title:	Size-dependent electro-osmosis in a microchannel with low-permittivity, salt-free media
Authors:	Chang,FM;Chang,YW;Sheng,YJ;Tsao,HK
Contributors:	化學工程與材料工程學系
Keywords:	CAPILLARY-ELECTROPHORESIS
Date:	2010
Issue Date:	2012-03-27 16:26:00 (UTC+8)
Publisher:	國立中央大學
Abstract:	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]
Relation:	APPLIED PHYSICS LETTERS
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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