自清洁型超疏水铜网的制备及其油水分离性能

Preparation of self-cleaning superhydrophobic copper mesh and its oil-water separation performance

利用碱液氧化法在铜网上生长纳米针状粗糙结构,并枝接具有pH响应性的低表面能长链硫醇分子,制备了空气中超疏水超亲油、碱性溶液中超亲水水下超疏油金属铜网。对改性金属网的表面结构、接触角、粘附力等性能进行表征。结果表明,亲水硫醇分子所占比例为20%时,改性铜网在空气中水的接触角为154.12°,粘附力为0.025 mN,对油的接触角为0°,改性铜网表面油滴在pH为12的溶液中能够自动脱附,针对不同种类油滴的油水混合物进行分离,分离效率在95%左右,并且重复使用10次后分离效率依然保持在90%以上。

Nano-needle-like rough structure was grown on copper wire by lye oxidation method,and super-hydrophilic super-lipophilic in air and super-hydrophilic water in alkaline solution were prepared by grafting a long-chain thiol molecule with pH-responsive low surface energy.Under the super oleophobic metal copper mesh.The surface structure,contact angle,adhesion and other properties of the modified metal mesh were characterized.The result showed that when the proportion of hydrophilic thiol molecules is 20%,the contact angle of modified copper mesh in air is 154.12°,the adhesion is 0.025 mN,the contact angle to oil is 0°,and the surface of modified copper mesh is oil droplets.It can be automatically desorbed in a solution with a pH of 12,and the oil-water mixture of different types of oil droplets is separated,the separation efficiency is about 95%,and the separation efficiency remains above 90%after repeated use for ten times.