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Issue 7, 2005
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Long-term stable electroosmotic pump with ion exchange membranes

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Abstract

We present the design, fabrication and test of a novel inline frit-based electroosmotic (EO) pump with ion exchange membranes. The pump is more stable than previous types due to a new flow component that ensures a controlled width of the diffusion layer close to the ion exchange membranes. The pump casing is constructed in polymers while the EO active part, the frit, is made in a nanoporous silica. The pressure capability of the pump is ΔpmV = 0.15 bar V−1. The flow rate to current ratio is Qm/I = 6 µL min−1 mA−1. This translates to Δpm = 4.5 bar and Qm = 6 µL min−1 at ΔV = 30 V. The pump has been tested with four different buffer concentrations. In order to investigate day-to-day reproducibility each Qp pump characteristic has been recorded several times during hour-long operation runs under realistic operating conditions.

Graphical abstract: Long-term stable electroosmotic pump with ion exchange membranes

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Publication details

The article was received on 10 Mar 2005, accepted on 10 May 2005 and first published on 31 May 2005


Article type: Paper
DOI: 10.1039/B503626G
Citation: Lab Chip, 2005,5, 730-738
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    Long-term stable electroosmotic pump with ion exchange membranes

    A. Brask, J. P. Kutter and H. Bruus, Lab Chip, 2005, 5, 730
    DOI: 10.1039/B503626G

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