Effect of Wrinkled Microstructure on Surface Wettability of Ginkgo Leaves

Xiao Li Zhao; Wei Wei An; Zhan Shan Liu; Hai Chao Yu

doi:10.4028/www.scientific.net/KEM.609-610.1437

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 609-610Effect of Wrinkled Microstructure on Surface...

Effect of Wrinkled Microstructure on Surface Wettability of Ginkgo Leaves

Abstract:

In this work, the effect of wrinkled microstructures on surface wettbility of ginkgo leaf was investigated. The upper and lower layers of the ginkgo leaf were comparatively measured by Scanning Electron Microscopy (SEM) for contrast of morphological characters. Measurement results show that the upper epidermis is mainly composed of regularly long-rangle stripes of cellular structures with gently smooth cell wall. On the other hand, the lower one is made up of chaotically isolated cellular structures with wrinkled cell wall. The comparative measurement of contact angle (CA) and roll-off angle in the upper and lower epidermis with deionized water was conducted. Wetting behaviors indicate that the lower has stronger hydrophobicity and weaker adhesion than the upper. Through theoretical analysis, the difference in wettability and adhesion was the result of isolated micro-bumps made by hierarchical wrinkles on the lower epidermis, leading to form solid-air-liquid interface between water and wrinkled surface. This research explains the difference of ginkgo leaf in wettability, and has important reference value in the design and preparation of the surface for the biomimetic materials.

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Periodical:

Key Engineering Materials (Volumes 609-610)

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1437-1441

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.609-610.1437

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Online since:

April 2014

Authors:

Xiao Li Zhao*, Wei Wei An, Zhan Shan Liu, Hai Chao Yu

Keywords:

Contact Angle, Ginkgo Leaf, Roll-Off Angle, Wettability, Wrinkle

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