Triboelectric Charging‐Driven Efficient Submicron Oil Mist Capture by Araucaria Leaf‐Inspired Amphiphilic Structures

ABSTRACT Oil mist is a ubiquitous airborne pollutant in industrial environments. It poses significant risks to production safety and human health. However, efficient capture of submicron oil mist particles remains a widely recognized technical challenge in industrial air purification. Inspired by pine needles and Araucaria leaves, this study designs an asymmetric biomimetic amphiphilic surface. For the first time, triboelectric negative air ion technology is integrated with a biomimetic oil‐collecting interface to construct a novel oil mist collection system. Oil mist particles are initially charged by negative air ions generated from a triboelectric nanogenerator‐driven ionization unit, followed by electric‐field‐induced acceleration that promotes collision and agglomeration. Under airflow‐driven transport, the charged particles migrate toward the amphiphilic surface. There, they are efficiently captured and enriched. When the system is activated, the total collected oil mass increases by 827% under the laboratory‐generated oil‐mist conditions. When applied to automotive exhaust treatment, the system achieves an oil mist removal efficiency of up to 91.25% and maintains efficiencies above 90% over repeated operating cycles. This work elucidates the coupled evolution of particle charging, agglomeration, migration, and enrichment during oil mist capture, providing a promising design approach for advanced aerosol collection technologies.