Rapid Interfacial Reconfiguration Via Microwave Air Plasma Enables Durable Superamphiphobic Coatings

The structural and chemical instability of liquid-repellent coatings remains a major limitation to durable surface protection under harsh conditions. Here, an atmospheric-pressure microwave air plasma (MAP)-induced interfacial reconstruction strategy is reported, converting a PFDTES-modified SiO₂/epoxy precursor layer into a consolidated hierarchical superamphiphobic interface within 60 s. MAP induces controlled matrix etching to expose and reorganize the fluorosilane-modified SiO₂ framework, thereby coupling hierarchical roughness, fluorinated surface chemistry, and structural stabilization. The resulting coating exhibits water and oil contact angles of 168° and 155°, respectively, and repels diverse solutions, suspensions, and emulsions. It retains superhydrophobicity after thermal treatment at 500°C and resists sandpaper abrasion, tape peeling, water-jet impact, sand impact, 1440 h of UV exposure, and 240 h of chemical immersion. It also delays droplet freezing and facilitates the removal of nanoscale powders and liquid stains. This work establishes MAP-induced interfacial reconfiguration as a rapid route toward durable multifunctional liquid-repellent coatings.