When self-assembly meets interfacial polymerization

Area of Science:

• Materials Science
• Chemical Engineering
• Surface Chemistry

Background:

• Interfacial polymerization (IP) and self-assembly are distinct processes involving interfaces.
• Combining these processes can lead to unique interfacial characteristics and morphological transformations.
• Developing advanced membranes is crucial for efficient water treatment and desalination.

Purpose of the Study:

• To fabricate an ultrapermeable polyamide (PA) reverse osmosis (RO) membrane.
• To investigate the role of self-assembled surfactant micellar systems in membrane morphology.
• To elucidate the mechanisms behind the formation of crumpled nanostructures during interfacial polymerization.

Main Methods:

• Fabrication of PA RO membrane via interfacial polymerization.
• Introduction of a self-assembled surfactant micellar system during IP.
• Multiscale simulations to study the formation mechanisms of nanostructures.

Main Results:

• An ultrapermeable PA RO membrane with crumpled surface morphology and enlarged free volume was successfully fabricated.
• Electrostatic interactions between m-phenylenediamine (MPD) and surfactant systems disrupted the monolayer, initiating PA layer patterning.
• Interfacial instability promoted the formation of a crumpled PA layer with increased surface area, enhancing water transport.

Conclusions:

• The study provides insights into the synergistic mechanisms of IP and self-assembly for membrane fabrication.
• The findings are fundamental for designing high-performance desalination membranes with enhanced water permeability.
• The crumpled morphology is key to achieving superior water transport properties.