Study On Preparation And Dustproof Performance Of Robust And Transparent Superhydrophobic Coating

Superhydrophobic materials have attracted widespread attention due to their special wetting properties,and have shown broad application prospects in the fields of dust-proof and self-cleaning,anti-icing and anti-fog,anti-corrosion,and oil-water separation.With the deepening of research and application,people have further generated new demands for transparent superhydrophobic materials with unique optical properties.In the construction of artificial transparent and superhydrophobic surfaces,the low surface energy of the target surface and the construction of delicate microstructures on the target surface are the two key factors for achieving surface transparency and superhydrophobicity.Although some progress has been made,there are still many problems in the durability of transparent superhydrophobic materials,such as being easily damaged by mechanical external forces,unstable superhydrophobic properties of the surface under extreme environments,and aging,etc.,which limit the wide range of applications of transparent hydrophobic coating technology.In response to the above problems,this paper designed and prepared a series of transparent superhydrophobic surfaces by constructing microstructure and functionalization of the material surface,and characterized them by SEM,EDS,UV-Vis absorbance photometer,contact angle,durability,dust resistance and other test and characterization methods.The specific work is as follows:First,using a glass plate as the substrate,the hydrophobic Si O₂ nanoparticles are modified on the substrate by spraying.As the ethanol solvent evaporates,the Si O₂nanoparticles can combine with other nanoparticles and the surface of the substrate through intermolecular forces to obtain a nanoporous structure.Subsequent fluorination by vapor deposition method further reduces the surface free energy of the coating.The nano-porous structure is beneficial to reduce the scattering of light and endow the coating with high transparency.Experiments have shown that when the number of sprays is 5,the light transmittance is above 82%,and the contact angle of the coating is about 153^o.The prepared transparent superhydrophobic surface has excellent water repellency and can effectively remove dust.The spray preparation method is suitable for large-area applications and has strong application value.Second,in order to further increase the stability of the above mentioned transparent superhydrophobic coating,a micro-nano composite structure coating composed of Si O₂nanoparticles and PDMS particles(MPs)is prepared on a glass substrate by a combination of heat treatment and spraying.First,the PDMS is heat-treated to evaporate to form a uniform microstructure on the glass,and then spray Si O₂ dispersion and fluorination to reduce the surface free energy of the coating.The water contact angle of the obtained coating is as high as 155^o,the light transmittance is above 70%,and it has excellent dustproof performance,and the dust removal efficiency reaches 93.63%.The coating also has good mechanical stability,can withstand the impact of 300 g sand particles,and the contact angle is still above 150^o,maintaining an ultra-fine level.Third,the above research shows that the microstructure of PDMS can improve the durability of the transparent superhydrophobic coating,but at the same time,due to the influence of PDMS on the thickness of the coating,the transparency of the superhydrophobic coating is slightly reduced,which is a better synergy The application of transparent super-hydrophobic coating on the surface of silicon-based solar cells to prevent dust,use chemical etching to build a micron-scale pyramid array on the surface of the silicon wafer to replace the PDMS micron layer,and continue to combine the spraying method to fill the gap of the array with low surface energy Si O₂ nanometers The particles are then fluorinated by vapor deposition to prepare a superhydrophobic surface.The pyramid array has a certain degree of mechanical stability,can resist the friction of external wind and sand,and uses microstructures to protect the nano-rough structures to improve the mechanical stability of the super-hydrophobic surface.The final prepared super-hydrophobic surface has a water contact angle in the air of about 155^o,a dust removal efficiency of more than 98%,and has excellent hydrophobic and dust-proof performance.Use a solution with a p H range of 3-14 to measure the contact angle of the surface,all of which are above 150^o,showing excellent chemical stability.After being rubbed by sand particles.Compared with ordinary surfaces,the reflectance of the treated silicon wafer surface is greatly reduced.This research provides a new idea for the application of superhydrophobic coatings to the surface of silicon-based solar cells for dust prevention.