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Related Experiment Videos

Bulk modification of polymeric microfluidic devices.

Joseph Wang1, Alexander Muck, Madhu Prakash Chatrathi

  • 1Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA. joewang@nmsu.edu

Lab on a Chip
|January 27, 2005
PubMed
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Researchers developed a new method to modify plastic microfluidic chips during fabrication. This bulk modification enhances electroosmotic flow (EOF) and pH sensitivity, enabling high-performance polymer microchips.

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Microfluidics

Background:

  • Surface properties of microfluidic devices significantly influence fluid dynamics.
  • Existing methods for surface modification can be complex and time-consuming.

Purpose of the Study:

  • To develop an effective bulk modification route for controlling surface chemistry and performance of polymeric microfluidic chips.
  • To introduce functional moieties (carboxy, sulfo, amino) into polymer substrates during fabrication.
  • To enhance electroosmotic flow (EOF) and pH sensitivity in plastic microchips.

Main Methods:

  • Tailored copolymerization of monomers during atmospheric-pressure molding to modify the bulk microchip material.
  • Incorporation of methylacrylic acid (MAA), 2-sulfoethyl-methacrylate, and 2-aminoethyl-methacrylate monomers.

Related Experiment Videos

  • Investigating the effects of modifier loading and pH on EOF in modified poly(methylmethacrylate) (PMMA) microchips.

    • Main Results:

    • A 6% MAA-modified PMMA microchip showed a significant increase in electroosmotic mobility (from 2.12 to 4.30 x 10(-4) cm(2) V(-1) s(-1)).
    • A 3% aminoethyl modified PMMA microchip demonstrated reversed electroosmotic mobility (-5.6 x 10(-4) cm(2) V(-1) s(-1) at pH 3.0).
    • Modified devices exhibited reproducible, stable EOF behavior with pH sensitivity.

    Conclusions:

    • Bulk modification during fabrication is an effective strategy for enhancing polymeric microchip performance.
    • The developed protocol allows for tunable surface properties, including controlled EOF and pH sensitivity.
    • This one-step fabrication/modification process facilitates the widespread production of high-performance plastic microfluidic devices.