UV-curable Nanocasting Technique To Prepare Biomimetic Fluoine-containing Superhydrophobic Surface

In recent years,research on fabricating superhydrophobic materials,has received wide attention for their diverse applications ranging from anti-fogging,anti-fouling,self-cleaning,anti-corrosion,guided transport of water droplets,oil-water separation to biology and medicine.We believed that it is the combination of surface roughness and low-surface-energy modification that leads to superhydrophobicity.In nature,many leaves of plants and feet or wings of inserts have well demonstrated superhydrophobic surfaces,such as lotus,wings of butterfly,the feet of water strider and the eyes of the mosquito etc.Inspired by nature,material scientists have synthesized artificial superhydrophobic surfaces by various methods including the solution,sol-gel,laser-etching,electrospinning,self-assembly method.However,until now it is still quite challenging to fabricate more robust,good recyclability,large-scale preparation and well-defined microstructures superhydrophobic materials with a simple method.In present work,we conceive a strategy to address the above consideration,and a facile production of more superhydrophobic material in a massive,good recyclability and low-cost process is achieved.It is well known that UV-curing technology is widely used in many fields because of its advantages,such as solvent-free,high polymerization rate and low energy consume.And fluorine-containing prepolymer in UV-curable systems can give cured materials peculiar hydrophobicity,chemical stability,high thermal and weather resistance and low surface energy.Herein by combining fluorine-containing resin and UV-curable we present a convenient UV-curable nanocasting technique for the fabrication of hierarchical lotus-leaf-like superhydrophobic surface.In this study,by directly replicating the lotus leaves as the template to create negative hierarchical lotus-leaf-like surface using the PDMS,and then the negative PDMS as the template to fabricate the UV-curable fluorine-containing prepolymer with the hierarchical lotus-leaf-like surface coating.Using this method the micro-nano lotus-leaf-like surface could be got completely,which was more robust and superior bulk superhydrophobic materials.The water contact angle(WCA)could achieve 172°±2°,while the hexadecane spread rapidly on the bionic surface.And there was robust hydrophobic function when exposed to either air or oil.Moreover,the bionic super-hydrophobic coating was not only resistant to contamination of life,but it also had a good inhibition on the cell adhesion.Further,there was the superoleophobic/superhydrophilic property of the bionic fluorine-containing surface.So we designed a superhydrophobic/superoleophilic film based on above research,which could be used for oil-water separation after laser hole drilling with 150?m.In contrast to the reported,the superhydrophobicity/superoleophilicity film exhibited the capacity of separate a large amount of oil-water mixtures with in a few minute,which was low-cost,environmental friendliness,and good recyclability.