TITLE

Effect of wrinkled microstructure on surface wettability of ginkgo leaves

AUTHOR(S)
Xiaoli Zhao; Weiwei An; Zhanshan Liu; Haichao Yu
PUB. DATE
August 2014
SOURCE
Key Engineering Materials;2014, Vol. 609-610, p1437
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this work, the effect of wrinkled microstractures 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.
ACCESSION #
95544327

 

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