旱金莲叶、花表面的超疏水性研究，

The study on super-hydrophobicity of the surfaces of nasturtium's leaves and flowers

旱金莲的叶、花表面有很好的超疏水性,水滴在其表面的静态接触角为150°、145°,滚动角分别约为5°、10°,通过扫描电镜观察发现,在其叶、花的表面分布有大量呈规则排列的微纳米级复合"花簇"、"凹槽"。微纳米复合结构使其表面有良好的超疏水性,雨后,能保持"滴水不沾"、"一尘不染"。采用Cassie理论对其表面的超疏水性进行了理论分析。

There exhibited super-hydrophobicity of surface of flowers and leaves of Nasturtium, the contact angles on leaves and flowers were about 150° and 145° ,respectively, the glide angle was approximately 5° and 10°. Many regularly arranged composite grooves and floral clusters of micro and nanometers were found on the surfaces by field emission scanning electron microscope （FE-SEM）. The super-hydrophobicity was formed due to the cooperate effect of micro and nano composite structures and the low surface of free energy, the special structures of flowers and leaves kep the surface clean and dry after raining. Finally, the super-hydrophobicity was discussed on the basis of Cassie＇s theory.