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An integrated micromachined electrochemical pump and dosing system.
S Böhm1, W Olthuis, P Bergveld
1MESA Research Institute, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.
Biomedical Microdevices
|November 11, 2005
Summary
This study presents a novel micromachined pump for precise nanoliter liquid dosing. Electrochemical gas bubble generation accurately controls flow rates and dispenses preset fluid volumes for miniaturized systems.
Area of Science:
- Microfluidics
- Electrochemistry
- MEMS technology
Background:
- Precise liquid handling is crucial for miniaturized analytical systems.
- Existing micro-pumps face challenges in accuracy and integration.
Purpose of the Study:
- To develop and characterize a micromachined electrochemically driven pump.
- To demonstrate precise nanoliter volume dosing and controlled flow rates.
Main Methods:
- Fabrication of a silicon micromachined channel with a Pyrex cover and noble metal electrodes.
- Electrochemical gas bubble generation via water electrolysis for fluid actuation.
- Characterization of volume displacement and pump rates at varying currents.
Main Results:
- The pump accurately dispenses precise nanoliter volumes.
- Measured volume displacements closely matched theoretical predictions.
- Flow rates as low as a few nanoliters per second were precisely controlled.
Conclusions:
- The electrochemically driven micro-pump offers accurate and controllable nanoliter fluid dosing.
- Its simple design facilitates integration into miniaturized chemical analysis systems.
- Potential applications include reagent and calibration solution dispensing.