A new self-healing superhydrophobic coating, utilizing a unique double-layer structure, delivers enhanced durability against friction, corrosion, and offers self-cleaning properties for long-term protection.

Researchers have developed a self-healing superhydrophobic coating that combines epoxy resin (EP), polydimethylsiloxane (PDMS), and SiO₂ nanoparticles in a unique double-layer structure. By varying the number of SiO₂ nanoparticle layers, the coatings achieve increased surface roughness and enhanced superhydrophobicity. These coatings exhibit low surface energy, making them highly resistant to water adhesion and capable of self-cleaning.

The coatings’ durability is remarkable, showing strong resistance to corrosion and friction. Notably, as the number of SiO₂ layers increases, the coating’s ability to withstand friction and corrosion improves, while also enhancing adhesion to the substrate. The coatings maintained their superhydrophobic properties even after heavy abrasion with sandpaper, showcasing their long-lasting performance.

Self-healing and durable properties of advanced coatings

Additionally, the coatings exhibit self-healing capabilities, recovering their superhydrophobicity after exposure to oxygen or argon etching. This self-repair is facilitated by the upward movement of hydrophobic groups and the restoration of bond intensity, ensuring the coating’s functionality over time. Coatings subjected to argon etching displayed superior self-healing performance due to the increased Si-O-Si bond strength.

This advanced coating design offers significant potential for applications where durability, corrosion resistance, and self-cleaning properties are crucial, including in marine, automotive, and industrial fields.

Source: Progress in Organic Coatings Volume 190, May 2024, 108359