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Related Experiment Videos

Robust monolithic silica-based on-chip electro-osmotic micro-pump.

Fu-Qiang Nie1, Mirek Macka, Leon Barron

  • 1National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland.

The Analyst
|May 2, 2007
PubMed
Summary
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A novel electro-osmotic micro-pump (EOP) on a chip offers robust, compact micro-flow analysis. This system utilizes parallel monolithic silica columns for precise fluid control in microfluidic devices.

Area of Science:

  • Microfluidics
  • Analytical Chemistry
  • Materials Science

Background:

  • Micro-flow analysis requires precise and stable fluid control.
  • Existing micro-pumps often face challenges with solvent compatibility and flow rate control.

Purpose of the Study:

  • To develop a robust, compact, on-chip electro-osmotic micro-pump (EOP) for micro-flow analysis.
  • To integrate multiple EOP systems for adjustable flow generation.
  • To ensure compatibility with diverse solvents for versatile applications.

Main Methods:

  • Fabrication of a poly(methyl methacrylate) (PMMA) chip housing parallel electro-osmotic micro-pump systems.
  • Utilizing encased, monolithic silica capillary columns (10 x 0.1 mm I.D.) within the EOPs.
  • Integration of single, double, or triple column configurations for variable flow rates.

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Main Results:

  • A triple-column EOP generated flow rates up to 0.6 µL/min at zero pressure and >0.1 µL/min at 2.4 bar with 2 kV.
  • Monolithic silica demonstrated excellent compatibility with aqueous and organic solvents.
  • Low current (<4 µA) at 2 kV ensured stable, bubble-free operation.
  • The EOP system was successfully integrated into a microfluidic chip for combined sample injection and analysis.

Conclusions:

  • The developed on-chip EOP provides a robust and versatile solution for micro-flow analysis.
  • The modular design allows for tunable flow rates, enhancing its applicability.
  • The system's solvent compatibility and stable operation make it suitable for complex microfluidic applications.