Related Experiment Video
Updated: May 3, 2026
12:00
Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
Published on: March 21, 2014
12.0K
Determining Accurate Pore Structures of Polypropylene Membrane for ECMO Using FE-SEM Under Optimized Conditions
Makoto Fukuda1,2, Yoshiaki Nishite1, Eri Murata2
1Department of Biomedical Engineering, Kindai University, 930 Nishimitani, Kinokawa-City 649-6493, Wakayama, Japan.
Membranes
|June 25, 2025
Summary
Researchers developed a new method to observe the pore structure of polypropylene (PP) membranes used in extracorporeal membrane oxygenation (ECMO) devices. This technique minimizes damage during scanning electron microscopy (SEM) observation, ensuring accurate morphological analysis for improved medical device design.
Area of Science:
- Materials Science
- Biomedical Engineering
- Microscopy Techniques
Background:
- Extracorporeal membrane oxygenation (ECMO) devices are crucial for managing severe respiratory and cardiac failure, with hollow fiber membranes being key components.
- Polypropylene (PP) and polymethylpentene (PMP) are standard materials, but PP membranes with silicone coatings are also commercialized.
- Accurate observation of membrane pore morphology is essential for optimizing ECMO performance and preparing for future pandemics.
Purpose of the Study:
- To develop a method for accurately observing the detailed pore morphologies of polypropylene (PP) membranes used in ECMO.
- To suppress irreversible morphological changes during scanning electron microscopy (SEM) observation of non-conductive porous PP membranes.
- To enable detailed analysis of both surface and deep structures of fragile membrane samples.
Main Methods:
- Utilized a Field Emission Scanning Electron Microscope (FE-SEM) with a lower secondary electron image (LEI) mode.
- Employed low acceleration voltage, low magnification, and long working distance to minimize osmium sputtering-induced morphological alterations.
- Investigated both sputter-coating and non-sputtering methods for imaging non-conductive, porous, and fragile samples.
Main Results:
- Detailed convex surface morphologies of the non-conductive porous PP membrane were successfully observed using LEI mode.
- Minimizing osmium sputtering proved effective in preserving the delicate membrane structure.
- A method using secondary electron image (SEI) mode at appropriate settings allowed confirmation of deep sample morphology.
Conclusions:
- The developed FE-SEM method, particularly using LEI mode with minimized sputtering, accurately reveals the intricate pore structures of PP membranes.
- Non-sputtering techniques are valuable for preserving the morphology of porous and fragile materials like those in ECMO.
- This advanced imaging capability supports the development of next-generation ECMO devices for emerging infectious diseases.
