Theoretical Model Establishment And Robustness Study Of High Transparency&Superhydrophobic Optical Surfaces

Functional surfaces with high transparency and super hydrophobicity show a bright prospect in many fields such as aerospace,new energy industry,medical apparatus and instruments and construction industry.Nowadays,it remains several problems that limit the massively commercial applications.For example,the lack of the theoretical knowledge about the optical surfaces with super hydrophobicity and high transparency simultaneously causes the lack of academic guidance during fabricating new functional surfaces.Meanwhile,the expensive process costs cannot fit the situation of mass production.Moreover,the poor durability also restricts commercial usages.For solving the problems above,in this dissertation,the wetting state model based on wetting theory was established which could calculate contact angles and wetting depths of any liquid droplets on optical surfaces.In addition,transparent rates of nano-structure surfaces were predicted according to TIS theory and the transparent model was established.A series of nano-structure surfaces were simulated,with the prediction of wettability and transparency using the two theories above,in order to summarize the law of the surface performances affected by geometric factors of nano-structures such as structure heights,structure densities,structure sharpness and secondary roughness(airgap densities).The conclusions could be referenced as the guidance for surface fabrication.As the preparation of fabrication process,functional particles with nice hydrophobicity were developed.With the reference of the conclusions indicated by the models,the functional surfaces with two-scale structures were fabricated by sprayingnanoparticle process.The process details such as VPFDTES/VAPTES,Vgas /Vfunctional and particle-coating thickness were confirmed by a series of characterization experiments.The surfaces showed a good performance with ?168° of the water contact angle,?3° of the rolling angle and 82% of the transparent rate.Further,polymer-coating method was applied to reinforce the nano structures.SIS was added into functional particle suspensions to form bonds among particles and PVDF/HFP was platted onto particle coatings as protective films.VFNP/VSIS and polymer dipping time were controlled in order to minimize the loss of wettability and hydrophobicity and maximize robustness simultaneously.Compared with particle-coating surfaces,the wettability of the durable surfaces was not weakened and the transparency still met the high-transparent requirements,with ?167° of the water contact angle,?3° of the rolling angle and 74% of the transparent rate.Moreover,the surfaces could sustain the properties after 2m linear abrasion tests with 1k Pa pressure,100 g sand impact tests and strong acid/alkali tests for several hours,which proved that the durability of the surfaces were enhanced significantly.