Construction of Multifunctional Liquid-Like Coatings: Heterogeneous Interface Regulation Enabling Exceptional Drag...

Liquid-like coatings are highly valued for their ultralow viscosity and anti-fouling properties. This study tackles the challenge of balancing low sliding angles and low surface tension liquid repellency in these coatings by developing a dual-component system using dimethyldimethoxysilane (DMS) and 1H,1H,2H,2H-perfluorooctyldimethylchlorosilane (PFOS). Unlike conventional polydimethylsiloxane (PDMS) or perfluorosiloxane systems, this coating achieves high molecular chain flexibility and low surface energy through heterogeneous interface regulation, thereby realizing low sliding angles and broad-spectrum liquid repellency. The coating exhibits superior drag reduction, effective repulsion of low surface tension liquids (e.g., n-hexane sliding angle <3°), and broad-spectrum anti-fouling properties. It also shows excellent stability under extreme conditions, indicating significant potential for practical applications. This work systematically investigates the effects of monomer ratios and preparation processes on coating performance, establishing correlations between composition, structure, and performance. Notably, an anomalous decline in liquid repellency is observed when the PFOS monomer concentration exceeded a critical threshold, despite reduced surface energy. Through atomic force microscopy analysis and molecular dynamics simulations, this study reveals the influence mechanism of monomer ratio on dynamic wetting behavior from the perspective of molecular chain mobility for the first time. These findings provide valuable theoretical and technical insights for developing multicomponent liquid-like coating systems.