Preparation And Properties Of Superhydrophobic And Oleophobic Nanoparticle Coatings

Inspired by the flora and fauna in nature,lotus leaves,leeches,and other super-sparseness to water,on this basis,explore the mechanism with dual properties of hydrophobic and oleophobic.It is well known that layered structures coated with low surface energy materials produce superhydrophobic surfaces.However,a simple rough surface is not sufficient to produce super-dense properties,because the surface tension of oil is much lower than that of water.Some special structures,such as overhanging structures or double recessed structures,came into being.However,due to the disadvantages of high cost,complex preparation process,and poor mechanical durability,which seriously affect its practical application,there is an urgent need for materials with super hydrophobic and oleophobic properties,and at the same time,materials with low cost,simple process and good mechanical durability are required.This article provides a method for preparing super-hydrophobic and oleophobic coatings by spraying.Two nano-particles with the same particle size and different surface energy,different particle sizes and surface energy,and different surface energy with the same particle size are selected to provide a rough micro-nano structure.At the same time,low surface energy fluorides are modified to achieve oleophobicity.In order to increase the adhesion of the coating to the substrate,an epoxy curing coating is added.The content of the article can be summarized as follows:(1)Hydrophilic and hydrophobic SiO₂(same particle size,different surface energy): By comparing a coating prepared by a single SiO₂ and a double SiO₂ coating(two nano-SiO₂ have the same particle size but different surface energy),Hydrophobic and oleophobic test.The fumed nano-silica(hydrophilic)and hydrophobic nano-silica are used for the roughness structure,and perfluorodecyltriethoxysilane is used as the low surface energy substance.Adding epoxy resin binder on the basis of literature increases the wear resistance of the coating.Double sparse coatings with mechanical abrasion resistance can be prepared.(2)ZnO and hydrophobic SiO₂(different particle sizes and different surface energy): coatings are made by dip-coating epoxy resin and spraying superphobic solution.By adjusting the mass ratio of two nanoparticles with different particle sizes and surface energies,coatings with different microporous structures are produced to achieve the best superhydrophobicity and high oleophobicity.SEM images show micro-nano structures with overhanging structures of different sizes.In this process,epoxy resin is used as an adhesive material.ZnO nanoparticles and hydrophobic fumed silica nanoparticles are used to generate micro-nano structures,and 1H,1H,2H,2H-perfluorodecyltriethoxysilane(FAS-17)is used to modify the surface of the nanoparticles to Presents low surface energy.When the mass ratio of ZnO to hydrophobic SiO₂ nanoparticles is 3:3,the coating exhibits the best superhydrophobicity and high oleophobicity.In addition,the prepared coating has good mechanical durability.(3)Silicon oxide and tin oxide(different particle size,same surface energy):porous raspberry-shaped tin oxide nanoparticles were prepared by hydrothermal method and high temperature ablation,and the particle size was mostly 65-85 nm.The solution was prepared to prepare an ultra-sparse coating.It was found that the coating prepared by a single tin oxide nanoparticle had a low hydrophobic angle and could not achieve super-hydrophobic performance.Mixing nano tin oxide with silicon oxide double nano particles can achieve super hydrophobicity.Among them,the coating prepared by mixing tin oxide with hydrophilic silica has better liquid-repellent properties than hydrophobic silica.According to SEM analysis,it can be found that the surface structure of the former is rougher and denser,and certain nanopores can be observed.We chose glass,copper,and filter paper as substrates and find that they all have good superhydrophobic properties.A series of mechanical performance tests on the Sn O2/SiO₂ double nanoparticle coating found that the coating has good adhesion to various substrates.After tape peeling,bending test,and filter paper rubbing,the coating still has stable superhydrophobic properties.