自然界生物湿粘附功能表面结构的表征研究
Characterization of the Functional Surface Structure of Natural Biological Wet

两固体接触面间如何产生一种有效且持久的粘结一直是人们亟待攻克的难题。本论文针对陆生和水生生物，从生物进化角度探讨了其湿黏附潜在机制。对湿润环境下优异功能体表树蛙脚垫、爬岩鳅等的微纳结构进行了表征。研究表明：树蛙脚掌表面由外接圆直径为10 μm的多边形组成，且大多为六边形，六边形表面是由纳米柱组成的；爬岩鳅刚毛尖端约2 μm左右，爬岩鳅刚毛尖端易于伸入粗糙表面凹槽内。各向异性的微结构，使得爬岩鳅防止在溪流中被冲走。通过两种动物脚掌生物特性表征，揭示了多级微纳结构对水下粘附的影响机制，为面向功能的仿生设计提供了理论依据。
How to produce an effective and lasting bond between two solid contacts has been a difficult problem to overcome. This paper explores the potential mechanism of wet adhesion from terrestrial to aquatic organisms. The micro-nano structure of tree frog foot mat and climbing loach in the wet environment is characterized. The study shows that the sole surface of the tree frog is composed of polygons with an outer circle diameter of 10 μm, and is mostly hexagonal, the hexagonal surface is composed of nanopillars; the bristle tip is about 2 μm, the bristle tip is easy to extend into the rough surface groove. The anisotropic microstructure allows the climbing loach to prevent being washed away in the stream. The characterization of biological characteristics of two animal soles reveals the influence mechanism of multistage micro-nano structure on underwater adhesion. It provides a theoretical basis for functional-oriented biomimetic design.