Simple Fabrication And Application Of Biomimetic Liquid Infused Surfaces At Room Temperature

After understanding the basic wetting theory,the wetting state of droplets on the liquid infused surface（LIS）and its preparation principles,this article explores the simple preparation,performance and application of LIS.A substrate structure with reasonable roughness was successfully constructed at room temperature buy using chemical methods.At the same time,the modifiers used in the modification of the substrate structure are all non-fluorine compounds,which are low in cost,green and pollution-free.In addition to exploring the application of the LIS in the air environment,the interaction between the LIS and the bubble in the underwater environment was also researched,which had profound significance for the manipulation of the bubbles on the LIS.After successfully preparing PDA@Si O₂ nanoparticles with low surface energy by thesol-gel method,a nano-scale rough structure was constructed on the surface of various substrates by spraying method.The infused lubricating oil was silicone oil,which is low in price,low surface energy,pollution-free,green and had a strong affinity with the substrate.The prepared LIS had excellent lyophobic ability,and the droplet only needed an inclination angle of 3°on it to start slipping.With glass as the substrate,LIS exhibited excellent self-cleaning,anti-fouling,light transmittance,and the transparency of LIS glass was slightly improved compared to the original glass.In addition,LIS was stable in high temperature,high shear,ultraviolet radiation,and acid or alkali solutions.Due to the stable homogeneous lubricant film on the surface,LIS has significantly improved performance in terms of anti-icing,anti-corrosion,and water collection compared to original glass and super-hydrophobic glass.Using a chemical etching method,the copper sheet was immersed in a mixed solution of sodium hydroxide and ammonium persulfate to successfully construct a micro-nano scale structure.The fluorine-free 1-Octadecanethiol was used as the modifier to modify the surface,so that the surface had a good chemical affinity with the infused simethicone.Although underwater bubble had a larger contact area on the LIS,due to the presence of lubricating oil,the bubble was able to easily slide on the LIS driven by the buoyancy.The static and dynamic chemical interactions between underwater bubbles and the LIS were analyzed,which had profound significance for the manipulation of bubbles on the LIS.The velocity of bubbles on the LIS is affected by the microscopic morphology of the substrate.After 30 minutes of etching,the velocity of the bubbles is the fastest compared to other etch time.The viscosity and surface tension of lubricating oil,liquid medium can change the velocity of bubbles on LIS,and the velocity is greatly affected by the viscosity.