Covalent Organic Framework Membranes for Enhanced Gas Dissolution in Oxygenation

Area of Science:

• Materials Science
• Chemical Engineering
• Biomedical Engineering

Background:

• Membrane-mediated gas-to-liquid mass transfer is vital but limited by low gas solubility in water.
• Efficient gas exchange is critical for chemical reactions and biological processes, including artificial oxygenation.

Purpose of the Study:

• To develop advanced membranes for enhanced gas-to-liquid mass transfer.
• To investigate the efficacy of covalent organic framework (COF) membranes with unique nanochannel structures for improved oxygen transfer.

Main Methods:

• Fabrication of highly oriented covalent organic framework (COF) membranes featuring periodic, hydrophilic gradient nanochannels.
• Characterization of gas transfer rates and comparison with conventional membranes.
• Assessment of blood compatibility and anticoagulant properties.

Main Results:

• The engineered COF membranes demonstrated a significantly higher oxygen dissolution rate compared to macroporous membranes.
• Nanoconfinement effects and increased liquid meniscus curvature within the nanochannels enhanced oxygen transfer.
• Achieved an unprecedented O2 transfer rate of 2838 mL m-2 min-1 to blood, 11 times higher than poly(4-methyl-1-pentene).

Conclusions:

• The developed COF membranes offer a superior solution for membrane-mediated gas-to-liquid mass transfer.
• These membranes provide enhanced oxygenation efficiency with comparable hemocompatibility and reduced risk of gas embolism.
• The findings pave the way for next-generation artificial oxygenation devices.