Superhydrophobic Films of Electrospun Fibers with Multiple-Scale Surface Morphology

详细信息    查看全文

• 作者：Jong-Min Lim ; Gi-Ra Yi ; Jun Hyuk Moon ; Chul-Joon Heo ; Seung-Man Yang
• 刊名：Langmuir
• 出版年：2007
• 出版时间：July 17, 2007
• 年：2007
• 卷：23
• 期：15
• 页码：7981 - 7989
• 全文大小：1401K
• 年卷期：v.23,no.15(July 17, 2007)
• ISSN：1520-5827

文摘

Superhydrophobic nanofiber films were created from electrospun nanofibers with undulated surfaces at multiplescales in micrometers and nanometers. The electrospun nanofibers were produced out of aqueous solutions whichcontained water-soluble polymers and different colloids: monodisperse silica or polystyrene microspheres for largerparticles and monodisperse silica nanoparticles for smaller particles. Various types of fibrous films were produceddepending on the properties of the dispersing medium, the effects of additives, and the compositions of the bidispersecolloids. When polystyrene microspheres were used as sacrificial templates, macropores were left behind in thenanofibers 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 easeunder a relatively wide range of operating conditions. The surface properties of the films were characterized by contactangle measurement and an X-ray photoelectron spectrometer. Through the surface modification of the electrospunnanofibers with fluorinated silane coupling agents, superhydrophobic surfaces with low sliding angles were successfullyprepared.