Loofah-Inspired Hierarchical Omniphobic Membrane for Efficient Dissolved Gas Extraction

Area of Science:

• Materials Science
• Chemical Engineering
• Electrical Engineering

Background:

• Membrane wetting poses a challenge for online oil-gas separation in transformer monitoring.
• Reliable detection of dissolved gases is crucial for assessing the condition of oil-filled electrical equipment.

Purpose of the Study:

• To develop an omniphobic composite membrane for efficient oil-gas separation.
• To enable reliable online detection of dissolved gases in transformer oil.

Main Methods:

• Fabrication of a fluorinated carbon nanotube/Teflon AF/polyvinylidene fluoride (F-CNTs/Teflon AF/PVDF) composite membrane using a spraying-deposition strategy.
• Characterization of membrane morphology, chemical composition, wettability, and stability.
• Evaluation of oil-gas separation performance using transformer oil with dissolved gases.

Main Results:

• The composite membrane exhibited a loofah-like hierarchical structure and exceptional omniphobicity (contact angles: 168.2° for water, 127.5° for oil).
• The membrane demonstrated robust thermal and ultrasonic stability.
• Efficient dissolved gas extraction was achieved within 64 min, with a 25.6% improvement in permeation efficiency.

Conclusions:

• The developed omniphobic membrane shows significant promise for oil-gas separation in transformer condition monitoring.
• The loofah-inspired hierarchical structure contributes to the membrane's high performance.
• This technology facilitates reliable online dissolved gas analysis for electrical equipment maintenance.