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  Journal of Nanoscience Letters 2014, 4: 2
  Research Article
Facile fabrication of wetting-graded ZnO nanorod surface under UV irradiation with gradient intensity and its water-spreading behavior
  Yueqin Duana, Yan Wanga, Gaocan Qia,b, Zhihao Yuana,c  
a School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
b School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China
c Tianjin Key Lab for Photoelectric Materials & Devices, Tianjin 300384, China

  A solution growth of ZnO nanorod film was developed for fabrication of a wetting-graded surface from superhydrophobic to superhydrophilic based on controlling adsorbed UV light intensity on the surface through a thickness-graded CuSO4 solution. The as-prepared film was characterized by field-emission scanning electron microscopy, and its wetting behavior was valuated using drop shape analyzer. When a water droplet was placed on the gradient surface, its front edge spread toward, causing the elongation of the drop to the area with higher hydrophilicity, whereas the rear edge does not move because of the hysteresis effect. The gradual variation of surface wettability induced droplet to form a singular distribution height will generate many practical inspiration, such as fabrication of thickness-graded films and different nanostructured oxides. In addition, the successful fabrication of wettability variation over a large scale, would provide a guide for many physical and chemical processes and might have potential applications in micro-fluid devices.
  Wetting-graded surface; ZnO nanorod; Regulation of UV light intensity  

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