Study On Preparation And Hydrophobic Properties Of Superhydrophobic Zn,Co,Ni Materials Derive From Bio-Templates

Recently,considerable attention has been paid to super-hydrophobic metal materials for its waterproofness,frozen-resistance,corrosion-resistance and self-cleaning ability.They are widely used in anticorrosion and antifouling of metal,drag reduction of ship,deicing of refrigeration,etc.Actually,conventional super-hydrophobic metal materials synthesis via imitating rough structure on lotus leaf surface.However,it is hard to imitate the structure and super-hydrophobicity of natural organism thoroughly,which limits its development.Considerable attention has been paid on to biomorphic method which can copy the natural structure accurately and control the chemical constitution of materials.It is able to afford materials complex construction and outstanding superhydrophobic properties.In this study,super-hydrophobic Co,Zn,Ni materials were synthesized via natural template method.The natural indocalamus leaves,pine wood and walnut wood were first carbonized in argon condition to obtain carbon skeleton.Then the carbon skeleton was placed in cathode and a metal layer was prepared though electroplating.The metal layer was later modified by silane coupling agent.Finally,super-hydrophobic metal material with biomorphic structure was successfully achieved.The influence of solution,electric current density and reaction time of electroplating were investigated.The main contents and results are followed as:(1)Cobalt material was prepared by electroplating with carbide indocalamus leaves as template.Results confirmed that needle-like micro-nano composite surface was constructed based on the template structure,the template structure endows cobalt material with outstanding hydrophobicity.The contact angle of the sample is as high as 150°.(2)Pine wood with porous surface structure was used as the template to prepare zinc material.The results showed that wood could provide favorable structural advantages to form rough surface which can effectively improve hydrophobicity.The contact angle of the sample is 154°,and the rolling angle is only 5°.(3)The carbonized walnut wood was used as a template,nickel layer was first obtained by electroplating,then the sample was sintered at high temperature to remove template and finally achieved nickel sheet.In the experiment,the effects of concentration of electroplating solution and electroplating time on morphology and structure were explored.(4)The effects of concentration,current density and electroplating time on microstructure and hydrophobicity were investigated.The results showed that the parameters of electroplating make a difference on grain growth,deposition rate,coating uniformity,etc.