Biomimetic Design Of Hydrophobic Surface Mimicking The Typical Ornamental Plant Leaves In Changchun City

The superhydrophobic surface has a wide application prospect in industry, agriculture, aerospace, military, biomedical engineering, and domestic life. After co-evolution of millions of years, the creatures in nature have adapted the environment from many aspects including morphology, structure, physiology, behaviour, and function, providing innovative technic approach, work process, as well as design idea. In this thesis, the status and dynamic of international and China’s studies on superhydrophobicity and self-cleaning property were systematiclly expounded. The micro-morphological feature and rule of several plant leaves are observed. The chemical compositions of plant leaves were analyzed. The hydrophobicity, oleophobicity, and self-cleaning performance of plant leaves were investigated. Based on Cassie equation, new hydrophobicity models for plant leaf were established. The influening factors and mechanism of superhydrophobicity and self-cleaning on plant leaves were discussed. Using plant leaf as bio-template, PDMS as substrate, the superhydrophobic polymer film with leaf-like micro-structure was fabricated.The results show that the plant leaves are composed mainly of naturally hydrophobic materials such as protein, fat, etc. The plant leaves possess complicated micro/nano hierarchical structure, and display superhydrophobicity. The special wettability is attributed to the co-effect of structural element and chemical element. The biomimetic surface with outstanding wettability and superhydrophobicity can be prepared by mimicking multi-scale rough structure and modifying matter of low surface energy. There is some progress in analysis of bio-surface wetting mechanism and fabrication of biomimetic functional surface. The results of this thesis may offer novel theoretical evidence and methodological support for development of biomimetic material.