Research On The Fabrication And Application Of Special Wettability Materials On Metal Substrates

Inspired by“lotus effects”and“rose effects”,superhydrophobic surfaces have aroused considerable attentions in recent years.Those superhydrophobic surfaces have significant applications in daily life and industrial areas for their antifouling,anti-icing and anticorrosion properties.Up to now,numerous skilled methods have been developed to fabricate artificial superhydrophobic surface.However,the pure superhydrophobic surface that only repel water drops cannot fulfill the requirements of real life due to the complex and versatile outdoor conditions.Thus,fabrication of superhydrophobic/superoleophobic surface and superhydrophobic/superoleophilic surface significantly broaden the application of superhydrophobic surface because superhydrophobic/superoleophobic surfaces can prevent both water and oil and superhydrophobic/superoleophilic surfaces can repel water and rapidly wetted by oil.In this paper,a superhydrophobic and superoleophobic surface was prepared on aluminum substrates by a facile electrodeposition method and modificationwithperfluorooctyltriethoxysilane（CF₃（CF₂）₅（CH₂）₂Si-（OC₂H₅）₃）.Meanwhile,we fabricated superhydrophobic and superhydrophlic coatings on stainless steel mesh by one-step eletrodeposition method.The prepared coatings achieve excellent corrosion resistance and long-term stability.The main work and results in this research are shown as follows:（1）A superhydrophobic and superoleophobic surface was prepared on aluminum substrates by electrodeposition method and modification with perfluorooctyltriethoxysilane.The results show that the best condition is that aluminum substrates are electrodeposited in the electrolyte with 0.0625 mol L^-1 nickel sulfate and copper sulfate for 15 min at a current density of 0.04 A cm^-2.And the surface after electrodeposition was modified by 1 wt%ethanol solution of perfluorooctyltriethoxysilane for 1 hour.At this time the prepared surface of water contact angle and lubricating oil contact angle are more than 150°.Additionally,the prepared superhydrophobic and superoleophobic coatings achieve excellent corrosion resistance,long-term stability and repel various oil.（2）A novel superhydrophobic and superoleophilic surface was fabricated by one-step electrodeposition on stainless steel meshes.Field emission scanning electron microscopy（SEM）,energy-dispersive X-ray spectroscopy（EDS）,fourier transform infrared spectroscopy（FT-IR）and optical contact an gle measurements were used to characterize surface morphologies,chemical compositions,and wettabilities,respectively.The results indicated that the as-prepared mesh preformed excellent superhydrophobicity and superoleophilicity with a high water contact angle（WCA）of 162±1°and oil contact angle of（OCA）0°.Meanwhile,the durability and oil/water separation properties was further assessed.The result show as-prepared mesh exhibited continuous separation capacity of many kinds of oil/water mixtures,and the separation efficiency for lubrication oil/water mixture was about 98.6%.In addition,after 10 separation cycles,the as-prepared mesh possessed the WCAs of 155±2°,the OCAs of 0°and the separation efficiency of 97.8%for lubrication oil/water mixtures.The as-prepared mesh also retained superhydrophobic and superoleophilic properties after abrading,immersing in salt solutions and different pH solutions.