Journal ArticleDOI
Directional adhesion of superhydrophobic butterfly wings.
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TLDR
Direction adhesion on the superhydrophobic wings of the butterfly is showed and it is believed that this finding will help the design of smart, fluid-controllable interfaces that may be applied in novel microfluidic devices and directional, easy-cleaning coatings.Abstract:
We showed directional adhesion on the superhydrophobic wings of the butterfly Morpho aega. A droplet easily rolls off the surface of the wings along the radial outward (RO) direction of the central axis of the body, but is pinned tightly against the RO direction. Interestingly, these two distinct states can be tuned by controlling the posture of the wings (downward or upward) and the direction of airflow across the surface (along or against the RO direction), respectively. Research indicated that these special abilities resulted from the direction-dependent arrangement of flexible nano-tips on ridging nano-stripes and micro-scales overlapped on the wings at the one-dimensional level, where two distinct contact modes of a droplet with orientation-tuneable microstructures occur and thus produce different adhesive forces. We believe that this finding will help the design of smart, fluid-controllable interfaces that may be applied in novel microfluidic devices and directional, easy-cleaning coatings.read more
Citations
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Directional water collection on wetted spider silk
TL;DR: Artificial fibres are designed that mimic the structural features of silk and exhibit its directional water-collecting ability by tapping into both driving forces.
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Bioinspired Surfaces with Superwettability: New Insight on Theory, Design, and Applications
TL;DR: Design, and Applications Shutao Wang,“, Kesong Liu, Xi Yao, and Lei Jiang*,†,‡,§ †Laboratory of Bio-inspired Smart Interface Science, Technical Institute of Physics and Chemistry, and ‡Beijing National Laboratory for Molecular Science.
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Nature-inspired superwettability systems
TL;DR: In this paper, the historical development, new phenomena and emerging applications of superwettability systems are discussed and a review of the superwetability properties of interfacial materials is presented.
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A multi-structural and multi-functional integrated fog collection system in cactus
TL;DR: This unique system is composed of well-distributed clusters of conical spines and trichomes on the cactus stem; each spine contains three integrated parts that have different roles in the fog collection process according to their surface structural features.
Journal ArticleDOI
Design of ice-free nanostructured surfaces based on repulsion of impacting water droplets.
Lidiya Mishchenko,Benjamin Hatton,Vaibhav Bahadur,J. Ashley Taylor,Tom Krupenkin,Joanna Aizenberg +5 more
TL;DR: Factors contributing to droplet retraction, pinning and freezing are addressed by combining classical nucleation theory with heat transfer and wetting dynamics, forming the foundation for the development of rationally designed ice-preventive materials.
References
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Journal ArticleDOI
Ultrahydrophobic and Ultralyophobic Surfaces: Some Comments and Examples
Wei Chen,Alexander Y. Fadeev,Meng Che Hsieh,Didem Öner,Jeffrey P. Youngblood,Thomas J. McCarthy +5 more
TL;DR: In this article, the preparation of ultrahydrophobic and ultralyophobic surfaces using several techniques is described, and the authors emphasize that contact angle hysteresis is more important in characterizing lyophobicity than is the maximum achievable contact angle.
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Effects of Surface Structure on the Hydrophobicity and Sliding Behavior of Water Droplets
TL;DR: In this article, the sliding behavior of water droplets over pillarlike and groove structures was investigated and a proper design of the surface with respect to shape and extent of the three-phase line is more effective than the increase of contact angles merely by decreasing the solid−water contact area.
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The Lotus Effect: Superhydrophobicity and Metastability
TL;DR: It is concluded that nature employs metastable states in the heterogeneous wetting regime as the key to superhydrophobicity on Lotus leaves.
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Self-cleaning coatings
TL;DR: In this article, a review summarises the key topics in the field of self-cleaning coatings, concentrating on the materials that have been used in commercial applications and recent research that aims to improve these materials.
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On the Modeling of Hydrophobic Contact Angles on Rough Surfaces
TL;DR: In this article, the authors proposed a design procedure to develop a rough superhydrophobic substrate that accounts for the multiple equilibrium drop shapes, which is expected to work well to maximize the advancing contact angle of a drop.