A planar electroosmotic micropump

Journal Article (Journal Article)

Electroosmotic (EO) micropumps use field-induced ion drag to drive liquids and achieve high pressures in a compact design with no moving parts. An analytical model applicable to planar, etched-structure micropumps has been developed. This model consists of pressure and flow relations in addition to an analytical expression that can be used to estimate the thermodynamic efficiency of planar EO pumps. The analytical model was applied to guide the design of a pump consisting of an etched EO flow chamber for near-optimal hydraulic power performance. To achieve high efficiency, the working fluid used was deionized (DI) water with a conductivity of 3.0 × 10-4 S/m (pH = 5.7). The EO micropump was fabricated on a soda-lime glass substrate using standard microlithography and chemical wet etching techniques. The active pumping volume of the device consists of a wet-etched flow channel 1-mm long in the flow direction and 0.9 μm by 38-mm in cross section. The pump performance agrees well with the theoretical model. The pump can produce a maximum pressure of 0.33 atm and a maximum flow rate of 15 μL/min min at 1 kV.

Full Text

Duke Authors

Cited Authors

  • Chen, CH; Santiago, JG

Published Date

  • December 1, 2002

Published In

Volume / Issue

  • 11 / 6

Start / End Page

  • 672 - 683

International Standard Serial Number (ISSN)

  • 1057-7157

Digital Object Identifier (DOI)

  • 10.1109/JMEMS.2002.805055

Citation Source

  • Scopus