Abstract
Biological tiny structures have been observed on many kinds of surfaces such as lotus leaves, which have an effect on the coloration of Morpho butterflies and enhance the hydrophobicity of natural surfaces. We investigated the micro-scale and nano-scale structures on the wing surfaces of insects and found that the hierarchical multiple roughness structures help in enhancing the hydrophobicity. After examining 10 orders and 24 species of flying Pterygotan insects, we found that micro-scale and nano-scale structures typically exist on both the upper and lower wing surfaces of flying insects. The tiny structures such as denticle or setae on the insect wings enhance the hydrophobicity, thereby enabling the wings to be cleaned more easily. And the hydrophobic insect wings undergo a transition from Cassie to Wenzel states at pitch/size ratio of about 20. In order to examine the wetting characteristics on a rough surface, a biomimetic surface with micro-scale pillars is fabricated on a silicon wafer, which exhibits the same behavior as the insect wing, with the Cassie-Wenzel transition occurring consistently around a pitch/width value of 20.
Similar content being viewed by others
References
Neinhuis C, Barthlott W. Characterization and distribution of water-repellent, self-cleaning plant surfaces. Annals of Botany, 1997, 79, 667–677.
Feng L, Li S, Li Y, Li H, Zhang L, Zhai J, Song Y, Liu B, Jiang L, Zhu, D. Super-hydrophobic surfaces: From natural to artificial. Advanced Materials, 2002, 14, 1857–1860.
Ma M, Hill R M. Superhydrophobic surfaces. Current Opinion in Colloid and Interface Science, 2006, 11, 193–202.
Vukusic P, Sambles J R. Photonic structures in biology. Nature, 2003, 424, 852–855.
Bushnell D M, Moore K J. Drag reduction in nature. Annual Reviews in Fluid Mechanics, 1991, 23, 65–79.
Wagner T, Neinhuis C, Barthlott W. Wettability and contaminability of insect wings as a function of their surface sculptures. Acta Zoologica, 1996, 77, 213–225.
Cong Q, Chen G, Fang Y, Ren L. Super-hydrophobic characteristics of butterfly wing surface. Journal of Bionic Engineering, 2004, 1, 249–255.
Fang Y, Sun G, Cong Q, Chen G, Ren L. Effect of methanol on wettability of the non-smooth surface on butterfly wing. Journal of Bionic Engineering, 2008, 5, 127–133.
Parker A R, Lawrence C R. Water capture by a desert beetle. Nature, 2001, 414, 33–34.
Gao X, Jiang L. Water-repellent legs of water striders. Nature, 2004, 432, 36.
Wenzel R N. Resistance of solid surfaces to wetting by water. Industrial and Engineering Chemistry, 1936, 28, 988–994.
Cassie A B D, Baxter S. Wettability of porous surfaces. Transactions of the Faraday Society, 1944, 40, 546–551.
Patankar N A. Transition between superhydrophobic states on rough Surfaces. Langmuir, 2004, 20, 7097–7102.
Lafuma A, Quere D. Superhydrophobic states. Nature Materials, 2003, 2, 457–460.
Krupenkin T N, Taylor J A, Schneider T M, Yang S. From rolling ball to complete wetting: The dynamic tuning of liquids on nanostructured surfaces. Langmuir, 2004, 20, 3824–3827.
Wagner P, Furstner R, Barthlott W, Neinhuis C. Quantitative assessment to the structural basis of water repellency in natural and technical surfaces. Journal of Experimental Botany, 2003, 54, 1295–1303.
Patankar N A. Mimicking the lotus effect: Influence of double roughness structures and slender pillars. Langmuir, 2004, 20, 8209–8213.
Nosonovsky M, Bhushan B. Roughness optimization for biomimetic superhydrophobic surfaces. Microsystem Technologies, 2005, 11, 535–549.
Nosonovsky M. Multiscale roughness and stability of superhydrophobic biomimetic interfaces. Langmuir, 2007, 23, 3157–3161.
Barbieri L, Wagner E, Hoffmann P. Water wetting transition parameters of perfluorinated substrates with periodically distributed flat-top microscale obstacles. Langmuir, 2007, 23, 1723–1734.
Chen Y, He B, Lee J, Patankar N A. Anisotropy in the wetting of rough surfaces. Journal of Colloid and Interface Science, 2005, 281, 458–464.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Byun, D., Hong, J., Saputra et al. Wetting Characteristics of Insect Wing Surfaces. J Bionic Eng 6, 63–70 (2009). https://doi.org/10.1016/S1672-6529(08)60092-X
Published:
Issue Date:
DOI: https://doi.org/10.1016/S1672-6529(08)60092-X