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Related Experiment Videos

Polymer microchips bonded by O2-plasma activation.

Zhiyong Wu1, Nicolas Xanthopoulos, Frédéric Reymond

  • 1Laboratoire d'Electrochimie, Département de Chimie, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

Electrophoresis
|March 14, 2002
PubMed
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Plasma surface treatment enables strong, adhesive-free bonding of polymer microchips, crucial for microfluidic devices. This homogeneous fabrication method improves separation efficiency in capillary electrophoresis.

Area of Science:

  • Polymer microfabrication
  • Surface science
  • Microfluidics

Background:

  • Traditional polymer microchip fabrication often relies on adhesives or high temperatures.
  • Achieving robust, homogeneous bonding in polymer microfluidics is challenging.
  • Surface properties significantly influence microfluidic device performance.

Purpose of the Study:

  • To develop an adhesive-free, homogeneous fabrication technique for polymer microchips.
  • To investigate the effect of plasma surface treatment on polymer bonding.
  • To evaluate the performance of these microchips in microfluidic separations.

Main Methods:

  • UV laser photoablation for microstructuring polyethylene terephthalate (PET).
  • Oxygen plasma treatment for surface activation of PET substrates and covers.

Related Experiment Videos

  • Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) for surface characterization.
  • Testing electroosmotic flow (EOF) stability and capillary zone electrophoresis (CZE) separation efficiency.

    • Main Results:

    • Successful adhesive-free bonding of PET microchips below the glass transition temperature using plasma treatment.
    • Homogeneous microchannels exhibited stable electroosmotic flow over 20 days.
    • Capillary zone electrophoresis demonstrated high separation efficiency, achieving a plate height of 0.6 microm in homogeneous channels.
    • Surface chemistry analysis confirmed its critical role in microfluidic performance.

    Conclusions:

    • Plasma surface treatment is a viable technique for fabricating high-performance, homogeneous polymer microfluidic devices.
    • Adhesive-free bonding significantly simplifies microchip fabrication and enhances device stability.
    • Optimizing surface chemistry is paramount for achieving efficient microfluidic separations.