摘要
花生是一种常见的豆科作物.与低黏附超疏水的荷叶不同,花生叶表面同时具有超疏水和高黏附特性.水滴在花生叶表面的接触角为151±2°,显示出超疏水特性.此外,水滴可以牢固地附着在花生叶表面,将花生叶翻转90°甚至180°,水滴均不会从表面滚落,显示了良好的黏附性(黏附力超过80μN).研究发现,花生叶表面呈现微纳米多级结构,丘陵状微米结构表面具有无规则排列的纳米结构.花生叶表面特殊的微纳米多尺度结构是其表面呈现高黏附超疏水特性的关键因素.结合实验数据,对花生叶表面特殊浸润性机理进行了简要阐述.受此启发,利用聚二甲基硅氧烷复形得到了与花生叶表面微结构类似的高黏附疏水表面.本文以期为仿生制备高黏附超疏水表面提供新思路.
Peanut is a common legume.It is found that peanut leaves exhibit both superhydrophobicity and a high adhesive force with water,which is different from the lotus leaves with low adhesive superhydrophobicity.The water contact angle on peanut leaves is 151±2°.Furthermore,the water droplet does not slide on the peanut leaves surfaces when the surface is tilted at 90° or even upside down,indicating a high adhesive force to water（more than 80 μN）.Micro-and nanoscale hierarchical structures are present on the surfaces of peanut leaves,where the hill-like microstructures are covered by nanostructures in a random distribution.In combination with the experimental results,the wettability mechanism of peanut leaves is also presented in this paper.Micro-and nanoscale hierarchical structures play a critical role in the formation of superhydrophobic and high adhesive surfaces.Inspired by peanut leaves,artificial surfaces with both hydrophobicity and a high adhesive force with water are fabricated by duplicating peanut leaf surface microstructures using polydimethylsiloxane.We expect this research may provie an inspiration for the biomimetic construction of superhydrophobic materials with a high adhesive force.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2011年第2期403-408,共6页
SCIENTIA SINICA Chimica
基金
国家重点基础研究发展计划(2007CB936400)
国家自然科学基金(20920102036
20974113
21001013)
高等学校博士学科点专项科研基金
中央高校基本科研业务费专项资金资助
关键词
仿生
受生物启发
超疏水
高黏附
花生叶
biomimetic
bio-inspired
superhydrophobicity
high adhesion
peanut leaf
