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Characterization of micro-scale structures on plant leaf surfaces

LIU Yan-ru;WANG Lin-feng;DAI Zhen-dong;Institute of Bio-inspired Structure and Surface Engineering,College of Astronautics,Nanjing University of Aeronautics and Astronautics;  
In this paper,the surface morphologies and microstructures of four kinds of plant leaves( Hypericum monogynum,Ginkgo,Allium tuberosum and Fargesia spathacea) were studied. The different appearance characteristics of the four kinds of plant leaf surfaces were analyzed and the geometrical features were obtained by adopting typical mathematical models to fit the cross-section of the micro-structures on the surfaces. For the micro-structures of Hypericum monogynum,Ginkgo and Allium tuberosum leaves,sine function exhibited the highest fitting degree. For the micro-structures of Fargesia spathacea leaves,gaussian function had the highest fitting degree,while sine function also had a very high fitting degree. According to the geometric characteristics of the surface morphology and microstructure,it can be concluded sine function is the best description for the surface microstructures of Hypericum monogynum,Ginkgo,Allium tuberosum leaves and gaussian function is the best description for the surface microstructure of Fargesia spathacea leaf. The results provide useful data for the study of bio-surface,especially for the studies of plant surfaces and the applications of biomimetics.
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