Journal ArticleDOI
Directional adhesion of superhydrophobic butterfly wings.
Reads0
Chats0
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
More filters
Journal ArticleDOI
Wettability of porous anodic aluminium oxide membranes with three-dimensional, layered nanostructures
Weiwei Zhang,Liqing Huang,Chunyan Zi,Yakun Cai,Yu Zhang,Xueyuan Zhou,Fuqiang Shang,Lihua Zhao,You Liu,Gang Li +9 more
TL;DR: In this article, the architecture-dependent wettability of 3D, porous anodic aluminium oxide (AAO) membranes with varying surface morphologies including hierarchical, mesh and honeycomb nanostructures is reported.
Journal ArticleDOI
Nanoscale metal pillar arrays on elastomeric substrates for surface-enhanced Raman spectroscopy platform
TL;DR: In this paper, a facile, low-cost and scalable nanofabrication approach based on a hot embossing process that can replicate sub-micron to nanoscale features on elastomeric substrates was introduced.
Journal ArticleDOI
Guest editorial: Special issue on bio-tribology
TL;DR: A unified view on the lubrication mechanism responsible for the low friction in most soft biological tissues is presented and important underlying tribological mechanisms related to friction are discussed.
Drops on hydrophobic surfaces & vibrated fluid surfaces
Abstract: We set up a 2D computational Finite-Element Method (FEM) model describing the initial descent of a droplet down an inclined hydrophobic substrate. We solve the full Navier-Stokes equations inside the drop domain, and use the Arbitrary Lagrangian-Eulerian method to keep track of the droplet surface. The contact angle is included by using the Frennet-Serret equations. We investigate the behaviour of the drop velocity as a function of the slip length and compare with experimental results. Furthermore, we quantify the energy associated with centre of mass translation and internal fluid motion. The model predicts trajectories for tracer particles deposited inside the drop, and satisfactorily describes the sliding motion of steadily accelerating droplets. The model can be used for determining a characteristic slip parameter, associated with slip lengths and drag reduction for hydrophobic surfaces. PACS. 47.11.Fg Finite element methods – 47.55.DDrops and bubbles – 47.55.np Contact lines
Journal ArticleDOI
Fabrication of a micro/nanoscaled hierarchical structure surface on brass with anti-icing and self-cleaning properties
TL;DR: In this paper, a facile method combining the chemical etching process and hot-water treatment was used to construct a micro/nanoscaled hierarchical structure on a brass substrate.
References
More filters
Journal ArticleDOI
Super-hydrophobic surfaces: From natural to artificial
Lin Feng,Shuhong Li,Yingshun Li,Huanjun Li,Lingjuan Zhang,Jin Zhai,Yanlin Song,Biqian Liu,Lei Jiang,Daoben Zhu +9 more
TL;DR: In this article, a super-hydrophobic surface with both a large contact angle (CA) and a small sliding angle (α) has been constructed from carbon nanotubes.
Journal ArticleDOI
Bioinspired surfaces with special wettability
TL;DR: Recent progress in wettability on functional surfaces is reviewed through the cooperation between the chemical composition and the surface micro- and nanostructures, which may bring great advantages in a wide variety of applications in daily life, industry, and agriculture.
Journal ArticleDOI
Super-Water-Repellent Fractal Surfaces
TL;DR: In this article, the authors showed that fractal surfaces can be super water repellent (superwettable) when the surfaces are composed of hydrophobic (hydrophilic) materials.