A universal strategy to prepare hot liquid super-repellent surfaces for anti-scalding and anti-scaling

Abstract

Durably and fully repel hot liquid (representative by water and oil) is difficult to achieve because of the high-flux evaporation–condensation behavior, which caused a lot of trouble in life and production, such as scalding and scaling. In this work, we report a universal strategy to realize hot liquid super-repellency (HLSR) on various solid surfaces by structuring fluorine-modified micro-nano binary topography (F-MNBT). Cassie-Baxter model is still applying to the F-MNBT surfaces even it contacting to 95℃ water, that because nanostructures (with size below 50 nm) design provides hot liquid repellency and microcavities (with size of over 10 μm) design remains in their non-wetting state. Through this strategy, we demonstrate the unique advantage of the HLSR on various cloths for anti-scalding. In addition, we also develop a F-MNBT composite coating that can durably sustain HLSR after enduring various representative mechanical, thermal and chemical stresses, that can continuously perform self-cleaning and anti-scaling at high temperatures. This work promises new solutions for surface applications related to hot liquid, expecting to serve in heat insulation protection, thermal management system, pipeline transport, marine petroleum exploitation, and so on.