基于多孔氧化铝腐蚀的表面结构制备及其疏水性能研究

先采用阳极氧化法在铝基板上制备了多孔氧化铝(AAO)膜,并以铝基AAO膜作为前驱物,采用化学腐蚀溶液分别制备出了具有纳米结构、微米结构和微纳复合结构表面的薄膜材料结构。利用扫描电子显微镜、荧光分光光度计和电子能量色散谱仪等测试手段分析了薄膜材料表面结构,并在薄膜表面涂覆低表面能物质氟硅烷薄膜研究这些表面结构的疏水性能。研究结果表明:通过控制化学腐蚀时间可以在铝基AAO膜表面分别获取纳米结构、微纳复合结构和微米结构;与未腐蚀的AAO膜表面相比,三种表面结构都有效提高了疏水薄膜表面的疏水性能;在NaOH溶液腐蚀16 min条件下,表面呈现微纳复合结构,具有超疏水性能,水的接触角达到155°。

Super-Hydrophobic Property of Aluminum Plate Covered with Anodic Aluminum Oxide and Modified by Chemical Etching

The surfaces of the aluminum plates were modified,first by anodic oxidation;next,by coating with fluorosilane,and finally,by chemical etching in NaOH solution for different times.The impacts of the modification conditions,including the voltage,temperature,and time of the anodic oxidation,the concentration of NaOH solution,and etching time,on the porosity of the Al surfaces were studied.The pore size distributions and hydrophobic property of the porous Al plate were characterized with scanning electron microscopy,energy dispersive X-ray spectroscopy and fluorescence spectrophotometer.The results show that the fluorosilane coating and the etching time strongly affect the porosity.For instance,the density ratio of the nano-pores and micro-pores can be controlled by adjusting the etching time.In addition,the chemical etching significantly improves the hydrophobic property;and etching for 16 min.resulted in the super-hydrophobicity with the water contact angle of 155°.