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Digital flow control of electroosmotic pump: Onsager coefficients and interfacial parameters determination by Zuli Xu; Jianying Miao; Ning Wang; Weijia Wen; Ping Sheng is a Physics and Astronomy article available to read on EtoBox.

What is Digital flow control of electroosmotic pump: Onsager coefficients and interfacial parameters determination about?

Electroosmosis and streaming potential are two complementary electrokinetic processes related by the Onsager relation. In particular, an electroosmotic pump (EOP) is potentially useful for a variety of engineering and bio-related applications. By fabricating samples consisting of dry-etched cylindrical pores (50 μm in length and 3.5 μm in diameter) on silicon wafers, we demonstrate that the use of digital control via voltage pulses can resolve the flow regulation and stability issues associated with the EOP, so that the intrinsic characteristics of the porous sample medium may be revealed. Through the consistency of the measured electroosmosis (EO) and the streaming potential (SP) coefficients as required by the Onsager relation, we deduce the zeta potential and the surface conductivity, both physical parameters pertaining to the liquid-solid interface.

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Author

Zuli Xu; Jianying Miao; Ning Wang; Weijia Wen; Ping Sheng

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0038-1098)

Published

2011

Language

EN

Field

Physics and Astronomy (Physical Sciences)