Preparation And Properties Of Micro-nano Superhydrophobic Anti-icing Surface Capable Of Photothermal Deicing

The superhydrophobic surface can be used as an anti-icing surface by delaying the formation of surface ice crystals,and is expected to achieve suppression or prevention of surface ice formation and effective removal of surface area ice.However,the preparation methods of the super-hydrophobic surface are generally complicated,costly,difficult to achieve large-area preparation,and also have a single effect when used as an anti-icing surface,so it is difficult to achieve an ideal anti-icing effect.In order to achieve highly efficient anti-icing and fast deicing,this paper constructs micro-nano structures with photothermal effects on the surface of polymer materials,and develops a new generation of both anti-icing and active deicing.The wetting mechanism and ice adhesion mechanism of the superhydrophobic surface are deeply studied in this paper.A micro-superhydrophobic anti-icing surface is prepared on the EVA substrate by a simple and easy-to-operate spraying method.The microstructures are characterized by 3D profile and SEM.It was confirmed that both SiC microparticles and Dia microparticles are stacked on the surface of EVA to form a peak-like structure,which made the surface super-hydrophobic and low-adhesion.The water contact angle of EVA-SiC 2000 is as high as 159° and the roll angle is as low as 7°.Thus,it brings good anti-icing performance,showing the freezing time extended from 15 s to 62 s,and the ice adhesion strength reduced from 25.65 kPa to 13.27 kPa,which indicates that the surface micro-structure has positive influence on surface wetting characteristics and anti-icing properties.CNTs nanoparticles with photothermal effect are introduced to build a micro-nano superhydrophobic anti-icing surface on the EVA substrate together with SiC microparticles.The microstructure is characterized by 3D profile and SEM.The surface of EVA-SiC/CNTs has a micro-nanostructure,in which the larger SiC particles form microscale peaklike structures,and the smaller strip CNTs form a nanosized villous structure on the surface of the SiC particles.These micro-nanostructures distributed on the surface of the substrate provide the EVASiC/CNTs surface with excellent hydrophobic and anti-icing properties.The water contact angle of EVA-SiC/CNTs 2-1 is as high as 161°,and the rolling angle is as low as 2°.The freezing time is extended from 15 s to 66 s,which is increased by 340%,and the ice adhesion strength is reduced from 25.65 kPa to 2.65 kPa.In this paper,the surface has excellent photothermal characteristics.Only 1W of 808 nm near-infrared light illuminates a 3 mm thick ice layer.The ice layer can be completely melted in just 250 s,and the photothermal conversion efficiency is as high as 50.94%.This method achieves fast,efficient and safe photothermal deicing,which helps to expand the application research of anti-icing and deicing.A flexible SR matrix is introduced to prepare flexible micro-nano superhydrophobic antiicing surface.The microscopic morphology proves that the SiC/CNTs micro-nanostructure is well embedded in the SR matrix,which brings the same excellent superhydrophobic properties.Anti-icing performance and photothermal performance,where the water contact angle of SRSiC/CNTs 2-1 surface is as high as 157°,the rolling angle is as low as 2°.Moreover,the freezing time is 64 s,and the ice adhesion strength is as low as 4.42 kPa,which is reduced by 79.84%.In addition,the mechanical stability and wear resistance of the micro-nanostructure are also improved.The surface is also subjected to multiple bends to maintain superhydrophobic properties,which will help the SR-SiC/CNTs surface energy to be applied to the actual scene for ice protection and deicing.The fractal wetting model is used to deeply study the numerical relationship between the morphology and wettability of irregular micro-nanostructures.In this paper,the image recognition and the surface of the surface are calculated by computer programming,and the calculation of the wetting model of the irregular surface structure is realized.The obtained theoretical water contact angle is in agreement with the experimental value,which proves that the SiC/CNTs micro-nanostructure has decisive influence on its surface wettability.In this paper,the numerical relationship between surface micro-nanostructure and ice adhesion is further calculated.The results show that the SiC micro-peak structure provides a sufficient structural gap for the surface,which could effectively reduce the shear force required to separate the icesolid interface.At the same time,the CNTs nano villous structure reduces the adhesion to the condensed droplets,and further reduces the surface ice adhesion.It is indicated that the surface SiC/CNTs micro-nanostructure has a positive and important contribution to surface ice adhesion.