Maximizing fluid delivered by bubble-free electroosmotic pump with optimum pulse voltage waveform

Mena E. Tawfik, Francisco J. Diez

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

In generating high electroosmotic (EO) flows for use in microfluidic pumps, a limiting factor is faradaic reactions that are more pronounced at high electric fields. These reactions lead to bubble generation at the electrodes and pump efficiency reduction. The onset of gas generation for high current density EO pumping depends on many parameters including applied voltage, working fluid, and pulse duration. The onset of gas generation can be delayed and optimized for maximum volume pumped in the minimum time possible. This has been achieved through the use of a novel numerical model that predicts the onset of gas generation during EO pumping using an optimized pulse voltage waveform. This method allows applying current densities higher than previously reported. Optimal pulse voltage waveforms are calculated based on the previous theories for different current densities and electrolyte molarity. The electroosmotic pump performance is investigated by experimentally measuring the fluid volume displaced and flow rate.

Original languageEnglish (US)
Pages (from-to)563-571
Number of pages9
JournalELECTROPHORESIS
Volume38
Issue number5
DOIs
StatePublished - Mar 1 2017

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Clinical Biochemistry

Keywords

  • Bubble-free EO pump
  • Diffusion
  • Electromigration
  • High current density
  • Pulse voltage waveform

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