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Related Experiment Video

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Characterization of PEG-Modified Composite Membranes for Microfluidic Oxygenator Applications.

Nicholas C Higgins1, David G Blauvelt2,3, Shuvo Roy1

  • 1Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, CA 94143, USA.

Micromachines
|December 31, 2025
PubMed
Summary

Polyethylene glycol (PEG) coating enhances microfluidic oxygenator membranes, improving hemocompatibility and reducing protein adsorption for advanced extracorporeal membrane oxygenation (ECMO) devices.

Keywords:
extracorporeal membrane oxygenator (ECMO)hemocompatibilitymicrofluidicspolydimethylsiloxane (PDMS)polyethylene glycol (PEG)silicon membrane

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Medical Devices

Background:

  • Microfluidic oxygenators are key for advancing extracorporeal membrane oxygenation (ECMO).
  • Silicon-based membranes offer potential for improved gas transfer and fluid control.
  • Surface modification is crucial for enhancing hemocompatibility and preventing protein adsorption.

Purpose of the Study:

  • To characterize polyethylene glycol (PEG) surface modification on composite silicon-polydimethylsiloxane (PDMS) membranes.
  • To evaluate the impact of PEG coating on microfluidic oxygenator properties, including gas transfer and hemocompatibility.
  • To assess the stability and effectiveness of PEG modification for reducing protein adsorption.

Main Methods:

  • Surface characterization using X-ray photoelectron spectroscopy (XPS) and water contact angle goniometry.
  • Oxygen flux tests to quantify gas transfer rates.
  • Protein adsorption studies using human serum albumin (HSA).

Main Results:

  • Successful PEG attachment confirmed by XPS and increased hydrophilicity, stable for 2 weeks.
  • Oxygen flux rates of 89.6 ± 17.9 mL/min/m² for unmodified and 50.8 ± 11.7 mL/min/m² for PEG-coated membranes.
  • Significant reduction in HSA adsorption to 14 ± 6 μg/cm² on PEG-coated membranes.

Conclusions:

  • PEG surface modification effectively enhances hemocompatibility of silicon-PDMS membranes for microfluidic oxygenators.
  • The modified membranes demonstrate improved resistance to protein adsorption.
  • These findings support the development of optimized surface strategies for next-generation ECMO devices.