Journal article
Spatial Variations and Temporal Metastability of the Self-Cleaning and Superhydrophobic Properties of Damselfly Wings
Langmuir, Vol.28(50), pp.17404-17409
2012
Abstract
Self-cleaning surfaces found in nature show great potential for application in many fields, ranging from industry to medicine. The ability for a surface to self-clean is intimately related to the wetting properties of the surface; for a surface to possess self-cleaning ability it must exhibit extremely high water contact angles and low water adhesion. While investigating the self-cleaning properties of damselfly wings, significant spatial variations in surface wettability were observed. Within an area of 100 μm × 100 μm of the wing surface the water contact angle was found to vary up to 17.8°, while remaining consistently superhydrophobic. The contributions of both surface chemistry and topography to the hydrophobicity of the wings were assessed in an effort to explain these variations. Synchrotron-sourced Fourier-transform infrared microspectroscopy revealed that some of the major components of the wing were aliphatic hydrocarbons and esters, which are attributable to epicuticular lipids. The wing topography, as determined by optical profilometry and atomic force microscopy (AFM), also showed only minor levels of heterogeneity arising from irregular ordering of surface nanostructures. The measured contact angle of a single droplet of water was also found to decrease over time as it evaporated, reaching a minimum of 107°. This is well below the threshold value for superhydrophobicity (i.e., 150°), demonstrating that when the surface is in contact with water for a prolonged period, the damselfly wings lose their superhydrophobicity and subsequently their ability to self-clean. This decrease in hydrophobicity over time can be attributed to the surface undergoing a transition from the Cassie-Baxter wettability state toward the Wenzel wettability state.
Details
- Title
- Spatial Variations and Temporal Metastability of the Self-Cleaning and Superhydrophobic Properties of Damselfly Wings
- Authors
- Jafar Hasan (Author) - Swinburne University of TechnologyHayden K Webb (Author) - Swinburne University of TechnologyVi Khanh Truong (Author) - Swinburne University of TechnologyGregory S Watson (Author) - James Cook UniversityJolanta A Watson (Author) - James Cook UniversityMark J Tobin (Author) - Australian SynchrotronGediminas Gervinskas (Author) - Swinburne University of TechnologySaulius Juodkazis (Author) - Swinburne University of TechnologyJames Y Wang (Author) - Swinburne University of TechnologyRussell J Crawford (Author) - Swinburne University of TechnologyElena P Ivanova (Author) - Swinburne University of Technology
- Publication details
- Langmuir, Vol.28(50), pp.17404-17409
- Publisher
- American Chemical Society
- Date published
- 2012
- DOI
- 10.1021/la303560w
- ISSN
- 0743-7463; 0743-7463
- Organisation Unit
- School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
- Language
- English
- Record Identifier
- 99448837402621
- Output Type
- Journal article
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- Domestic collaboration
- Web Of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
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