Micro-morphological Models for Hydrophobicity on the Surface of Moth Wing

DOI

10.2991/iea-15.2015.175How to use a DOI?

Keywords

micro-morphology; contact angle; hydrophobicity model; biomaterial; moth

Abstract

The micro-morphology, wettability and chemical composition of the moth wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle (CA) meter and a Fourier transform infrared spectrometer (FT-IR). The micro-morphological models for hydrophobicity on the wing surface were established on the basis of the Cassie-Baxter equation. The wetting mechanism was discussed from the perspective of biological coupling. The moth wing surfaces are composed of naturally hydrophobic material and display micro/nano hierarchical structures, including primary structure (micrometric scales), secondary structure (submicro longitudinal ridges and lateral bridges) and tertiary structure (nano stripes). The wing surfaces exhibit high hydrophobicity (CA 150~158°) and low adhesion (sliding angle 1~3°). The cooperative effect of material element and structural element contributes to the special wettability of the wing surface. In micro-dimension, the smaller the width and the bigger the spacing of the scale, the stronger the hydrophobicity of the wing surfaces. In nano-dimension, the smaller the height and the smaller the width and the bigger the spacing of the longitudinal ridge, the stronger the hydrophobicity of the wing surfaces. The micro/nano structural model provides CA predictions in good accord with the data measured. The result may bring inspiration for biomimetic design and preparation of smart interfacial materials and novel self-cleaning coatings.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Sun Gang
AU  - Fang Yan
PY  - 2015/09
DA  - 2015/09
TI  - Micro-morphological Models for Hydrophobicity on the Surface of Moth Wing
BT  - Proceedings of the AASRI International Conference on Industrial Electronics and Applications (2015)
PB  - Atlantis Press
SP  - 707
EP  - 711
SN  - 2352-5401
UR  - https://doi.org/10.2991/iea-15.2015.175
DO  - 10.2991/iea-15.2015.175
ID  - Gang2015/09
ER  -