Study On Electrodeposited Zinc Micro/nano-filaments And Their Special Wettability

Superamphiphobic material with extreme repellency to water and oil are very attractive in a wide range of fields.However,the fabrication processes for surperamphiphobic materials are very hard because the surface tension of oil is much lower than water.Although there are many methods to create superamphiphobic materials,they are always low effective and expensive.So it is still a challenge to create superamphiphobic materials by simple and time saving method.A simple,time-saving method was supported to fabricate superamphiphobic coating with micro/nano-filaments of zinc in this paper,and the wettability was measured.What's more,the directional transportation materials for oil and water were prepared based on the superamphiphobic coating.The main works of the paper are shown as follows:The supramphiphobic coating with micro/nano-filaments of zinc was prepared by electrochemical deposition and dip coating methods with contact angles above157o,sliding angles below 3o and adhesive force smaller than 0.018 mN for water and oil(hexadecane).The morphology and wettability of the deposition coatings were systematically characterized by scanning electron microscopy(SEM)and contact angle meter.It was found that the morphology and wettability of zinc coating highly depended on deposition time,current density,content of zinc and temperature.The polar and nonpolar liquids-repelling(water and oil)superamphiphobic zinc coating with micro/nano-filaments kept superamphiphobicity with CAs larger than 152o and SAs smaller than 7o for hot water and hexadecane(85 o?).And the superamphiphobic zinc coating could keep clean when the water droplet,hexadecane droplet,soap water and common drinks impacted with it.The water and hexadecane droplet rebounded on the surface and the soap water and drinks ran away from it.The superamphiphobic zinc coating with micro/nano-filaments successfully achieved the under-liquids wettability experiments without contaminant,and shown a superoleophilic under water and superhydrophobic under oil.One side of the as-prepared superamphiphobic mesh(CA>150o,SA<10o)modified with zinc micro/nano-filaments coating was modified with lauric acid to prepare the Janus mesh.It was found that the modified side was hydrophiphobic-oleophilic(WCA>90o,OCA<90o)and the unmodified side kept superamphiphobic.The wettability of the modified side changed from hydrophiphobic-oleophilic to superhydrophiphobic-oleophilic(WCA>150o,OCA<90o)with the increase of the lauric acid content.When the mass fraction of lauric acid was up to 10 wt%,the WCA was 153o but OCAs were smaller than 50o on the modified side.The oils droplet could transport from superamphiphobic side to superhydrophiphobic-oleophilic but the water droplet couldn't transport.The water and oil couldn't transport from superhydrophiphobic-oleophilic side to superamphiphobic side.One side of the as-prepared superamphiphobic and amphiphobic meshes were modified with cellulose to prepare the superamphiphobic-amlyphilic and amphiphobic-amlyphilic Janus mesh,respectively.When the cellulose was up to 4 g,the modified side was superamlyphilic.The oils could directional transport form amphipbobic to superamlyphilic on the superamphiphobic-superlyophilic and amphiphobic-superamlyphilic Janus mesh,but the water could only directional transport form amphipbobic to superlyophilic on the amphiphobic-superamlyphilic Janus mesh.