Lim Jong-Min, Yi Gi-Ra, Moon Jun Hyuk, Heo Chul-Joon, Yang Seung-Man
National Creative Research Initiative Center for Integrated Optofluidic Systems and Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
Langmuir. 2007 Jul 17;23(15):7981-9. doi: 10.1021/la700392w. Epub 2007 Jun 15.
Superhydrophobic nanofiber films were created from electrospun nanofibers with undulated surfaces at multiple scales in micrometers and nanometers. The electrospun nanofibers were produced out of aqueous solutions which contained water-soluble polymers and different colloids: monodisperse silica or polystyrene microspheres for larger particles and monodisperse silica nanoparticles for smaller particles. Various types of fibrous films were produced depending on the properties of the dispersing medium, the effects of additives, and the compositions of the bidisperse colloids. When polystyrene microspheres were used as sacrificial templates, macropores were left behind in the nanofibers during the removal of polystyrene microspheres by calcination. The nonwoven films of electrospun nanofibers, which were decorated with silica microspheres or macropores, could be continuously produced with considerable ease under a relatively wide range of operating conditions. The surface properties of the films were characterized by contact angle measurement and an X-ray photoelectron spectrometer. Through the surface modification of the electrospun nanofibers with fluorinated silane coupling agents, superhydrophobic surfaces with low sliding angles were successfully prepared.
超疏水纳米纤维薄膜由具有微米和纳米尺度多尺度起伏表面的电纺纳米纤维制成。电纺纳米纤维由含有水溶性聚合物和不同胶体的水溶液制成：用于较大颗粒的单分散二氧化硅或聚苯乙烯微球以及用于较小颗粒的单分散二氧化硅纳米颗粒。根据分散介质的性质、添加剂的作用和双分散胶体的组成，制备了各种类型的纤维薄膜。当使用聚苯乙烯微球作为牺牲模板时，在通过煅烧去除聚苯乙烯微球的过程中，纳米纤维中会留下大孔。装饰有二氧化硅微球或大孔的电纺纳米纤维非织造薄膜可以在相当宽的操作条件范围内相当容易地连续生产。通过用氟化硅烷偶联剂对电纺纳米纤维进行表面改性，成功制备了具有低滑动角的超疏水表面。
