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 Δpm/ΔV
= 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 Q–p pump characteristic has been recorded several times during hour-long operation runs under realistic operating conditions.
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