Study On Preparation And Performance Of Superwettability Material By The Method Of Hydrogen Bubble As Template

Wettability is an important property of solid surface,which affects lots of applications,such as anti-icing,anti-fogging,self-cleaning,microdroplet transportation etc.Surface roughness and chemical composition are two critical factors governing the wettability,and controlling surface wetting performance by regulating the microstructure has become a research focus.However,most of the available methods are quite complex,and not feasible for large-scale production.Hydrogen bubble template method is a very effective way for constructing microstructures,which has many advantages including convenient,high efficiency,pollution-free,and low cost.Herein,by using the hydrogen bubble template method,different microstructures were constructured and surfaces with various superwetting performances were prepared.Firstly,based on the hydrogen bubble template method,hierarchical porous Ni were prepared.After heating at different temperature,a series of underwater superoleophobic Ni/NiO surfaces with different oil adhesions were obtained.Experimental results indicate that all the as-prepared surfaces have the superoleophobicity in water,and the adhesive force between the oil droplet and the surface can be controlled from extremely low(less than 1 μN)to very high(about 60 μN).The tunable effect can be attributed to different wetting states that result from different surface microstructures.Moreover,applications of these tunable adhesive surfaces for oil droplet transportation and self-cleaning were discussed.By using the as-prepared porous Ni/NiO as the template,PDMS films with different hierarchical micro-nanostructures and tunable adhesive super-hydrophobicity was prepared.The adhesive forces between a water droplet and the PDMS film can be adjusted from extremely low(about 8.3 μN)to very high(about 57 μN),and the tunable effect can be ascribed to different wetting states for the water droplets that result from different micro-nanostructures on the films.Noticeably,the obtained super-hydrophobic surfaces are acid/alkali-resisting,and water droplets with different p H values have similar contact angles and adhesive forces on the same surface.Finally,applications of the obtained surfaces for microdroplet transportation and self-cleaning are also discussed.Furthermore,by controlling the electrodeposition conditions and the heating temperature,PDMS with different tip geometries were also prepared to study dry adhesions between the film and solid substrate.Results indicate that taller pillars with larger tips show stronger adhesions.Finally,the hydrogen bubble template method was further extended to fabricate micro-nanostructures on the copper mesh substrate,and a novel porous structured copper mesh was prepared.The mesh shows superhydrophilicity in air and low-adhesive superoleophobicity in water.The mesh was used for oil–water separation,with the separation efficiency of higher than 99% for various oil–water mixtures.Importantly,after immersion into corrosive ac idic and basic solutions,the wetting properties and the separate performance of the mesh showed no apparent deterioration,indicating of as-prepared film has a good environmental stability.