Precision Covalent Organic Frameworks for Surface Nucleation Control.

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Ice and scale accumulation on surfaces presents significant economic and sustainability challenges.
• Existing passive ice/scale-repellent surfaces often fail under harsh conditions and lack durability.
• Many advanced repellent materials rely on toxic or bio-persistent perfluorinated compounds.

Purpose of the Study:

• To develop novel nanocoatings using covalent organic frameworks (COFs) for effective ice and scale inhibition.
• To create robust, transparent surfaces that prevent contamination and resist impact.
• To explore the nanoconfinement effect for delaying nucleation processes.

Main Methods:

• Synthesis of defect-free covalent organic frameworks (COFs).
• Post-synthetic functionalization to create nanocoatings with controlled nanoporosity.
• Testing of nanocoated surfaces for ice nucleation suppression, scale inhibition, and resistance to organic solvent impacts.

Main Results:

• Nanocoatings effectively inhibit ice nucleation down to -28°C.
• Scale formation was prevented for over two weeks under supersaturated conditions.
• Surfaces demonstrated high optical transparency (>92%) and resisted high-velocity organic solvent impacts (Weber numbers >10⁵).

Conclusions:

• Reticular mesoporous COFs provide a scalable and effective strategy for passive ice and scale inhibition.
• Nanocoatings exploit nanoconfinement effects to delay nucleation at the molecular level.
• This approach offers a sustainable alternative to perfluorinated compounds for advanced surface functionalities.