The Study Of Anti-icing Performance Of Slippery Liquid Infused Porous Surfaces Based On TiO₂ Nanoparticles

The adhesion and accumulation of ice may cause serious problems in aircraft,communication network,solar panels and wind turbines.In recent decades,a large number of studies and experiments have been conducted to inhibit the formation of ice or reduce ice adhesion.The super-hydrophobic coating has attracted lots of attention in the fields of anti-icing due to its unique wettability.However,it's easy for the super-hydrophobic coating to lose its super-hydrophobicity especially in the high humidity and low-temperature environment,which results in the degradation of its anti-icing ability.Therefore,another candidate with excellent anti-icing property-slippery liquid infused porous surfaces(SLIPS)has been proposed.In this work,TiO₂ porous nano-coating on a silicon wafer with superhydrophobicity was prepared by spraying process,followed by infusing with perfluoropolyether lubricant to obtain the SLIPS.Experimental results show that,due to the infused perfluoropolyether lubricant,the static icing time is enormously prolonged,the ice adhesion strength is greatly reduced,the surface frosting time is remarkably extended and the dynamic anti-icing effect is significantly improved.Despite its brilliant anti-icing property,the SLIPS tends to become very fragile and easy to be damaged due to the loss of lubricant during repeated icing/deicing tests,which could be due to the weak adhesion between the nanoporous coating and smooth substrate.Therefore a lubricant-infused surface through the combination of micro-cone hole array and TiO₂ porous nanostructure(P-SLIPS)was successfully fabricated.After the droplet erosion test,icing/deicing cycle test and sandpaper grinding test,the lubricant retention rate of the P-SLIPS is significantly improved,the growth of ice adhesion strength of the P-SLIPS is greatly reduced,and the wear of surface nanostructures of the P-SLIPS is also enormously reduced compared with the SLIPS.All these results are attributed to the introduction of micro-cone hole array structure,which can provide strong physical support for the TiO₂ nanoporous coating with its good mechanical properties,and greatly enhance the adhesion between the coating and the substrate.As a consequence,the surface coating on P-SLIPS would not be easily damaged,which can ensure its improved structural and anti-icing durability.