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借助于多巴胺在Fe3O4纳米颗粒表面自聚合形成聚多巴胺薄膜制备出Fe3O4/聚多巴胺(Fe3O4/PD)复合纳米颗粒,利用扫描电子显微镜、透射电子显微镜、X射线衍射仪对样品的形貌、结构及成分进行分析.所制备的颗粒经1H,1H,2H,2H-全氟癸基三氯硅烷化学修饰后表现出超疏水性.有趣的是,超疏水性的Fe3O4/PD纳米颗粒包裹在水滴表面能形成磁性液珠,该液珠(4μL)在亲水性玻璃表面上的接触角高达164°、滚动角为8°.这些磁性液珠具有良好的机械稳定性和强度,同时研究了外部磁场驱动液珠在平面、曲面、油相中运动.结果表明,磁性液珠能够有效应用于操作微流体装置中的液体输送.水滴在Fe3O4/PD纳米颗粒构成表面的接触角超过150°,而油滴则接近0°,因此,在磁场存在下,这些颗粒能用于吸收油水混合物中的油滴而实现油水分离.此外,回收的Fe3O4/PD纳米颗粒保持着超疏水性且能再次利用.
The Fe3O4 / polydopamine (Fe3O4 / PD) composite nanoparticles were prepared by the self-polymerization of dopamine on the surface of Fe3O4 nanoparticles to form the polydopamine films. The morphology, structure and morphology of the samples were characterized by scanning electron microscopy, transmission electron microscopy and X-ray diffraction The results showed that the prepared particles were superhydrophobic after chemical modification with 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane.It is interesting that superhydrophobic Fe3O4 / PD nanoparticles were coated on the surface of water droplets Magnetic beads can be formed which have a contact angle of up to 164 ° on the hydrophilic glass surface and a roll angle of 8. These magnetic beads have good mechanical stability and strength while the external magnetic field The results show that the magnetic beads can be effectively applied to the liquid transport in the microfluidic device.The contact angle of the droplets on the surface of the Fe3O4 / PD nanoparticles is over 150 °, while the oil Drops close to 0 ° so that these particles can be used to absorb oil droplets in the oil-water mixture for oil-water separation in the presence of a magnetic field.In addition, the recovered Fe3O4 / PD nanoparticles remain super-hydrophobic and can again use.