Influence of surface roughness on superhydrophobicity.

@article{Yang2006InfluenceOS,
  title={Influence of surface roughness on superhydrophobicity.},
  author={C. Yang and Ugo Tartaglino and B. N. J. Persson},
  journal={Physical review letters},
  year={2006},
  volume={97 11},
  pages={
          116103
        }
}
Superhydrophobic surfaces, with a liquid contact angle theta greater than 150 degrees , have important practical applications ranging from self-cleaning window glasses, paints, and fabrics to low-friction surfaces. Many biological surfaces, such as the lotus leaf, have a hierarchically structured surface roughness which is optimized for superhydrophobicity through natural selection. Here we present a molecular dynamics study of liquid droplets in contact with self-affine fractal surfaces. Our… 

Figures and Topics from this paper

Nanodesign of superhydrophobic surfaces
When deposited on a hydrophobic rough surface, a small water drop looks like a small pearl. In this study we investigate the conditions to observe such a phenomenon when the roughness of the
Wettability Switching Techniques on Superhydrophobic Surfaces
The wetting properties of superhydrophobic surfaces have generated worldwide research interest. A water drop on these surfaces forms a nearly perfect spherical pearl. Superhydrophobic materials hold
Nanodroplets on rough hydrophilic and hydrophobic surfaces
TLDR
It is concluded that for hydrophobic interactions the short-wavelength (atomistic) roughness is not very important, and it is shown that the nanodroplet is in a Cassie-like state.
Hierarchical structures for natural superhydrophobic surfaces.
TLDR
This study provides a mechanistic/thermodynamic explanation of how nature has developed a mechanically durable superhydrophobic surface, which can be an inspiration for the fabrication of artificial surfaces.
Is superhydrophobicity robust with respect to disorder?
TLDR
It is proved that introducing disorder, at fixed given roughness, will lower the contact angle: a disordered substrate will have a lower contact angle than a corresponding periodic substrate.
Molecular dynamics study on the hydrophobicity of a surface patterned with hierarchical nanotextures
Abstract Using all-atom molecular dynamics simulation, we investigated the wetting behavior of a water droplet on a surface texturized with nanoscale pillars. We studied the surfaces with
Superhydrophobic Surfaces Based on Fractal and Hierarchical Microstructures Using Two-Photon Polymerization: Toward Flexible Superhydrophobic Films
DOI: 10.1002/admi.201801126 other appealing properties.[5] Unsurprisingly, these advantages have facilitated the development of artificial hydrophobic materials with a variety of applications coming
Topographical length scales of hierarchical superhydrophobic surfaces
The morphology of hydrophobic CF4 plasma fluorinated polybutadiene surfaces has been characterised using atomic force microscopy (AFM). Judicious choice of the plasma power and exposure duration
Effect of substrate roughness on the apparent surface free energy of sputter deposited superhydrophobic polytetrafluoroethylene thin films
Surface morphology plays an important role in determining the superhydrophobic behavior of solids. To provide insights on the influence of roughness over a wide range, we have carried out a
The Effect of Sugar Content for the Wettability of Superhydrophobic Aluminum Substrate
  • Shuwei Lv, Xinming Zhang, Xiaodong Yang, Yingya Zhai
  • Physics
    Journal of Physics: Conference Series
  • 2021
A chemical etching technique is used to prepare a superhydrophobic surface with a honeycomb rough structure on the aluminum surface. Use SEM, Optical contact angle meter and Surface tension detector
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 48 REFERENCES
Transformation of a Simple Plastic into a Superhydrophobic Surface
TLDR
This work describes a simple and inexpensive method for forming a superhydrophobic coating using polypropylene (a simple polymer) and a suitable selection of solvents and temperature to control the surface roughness.
Mimicking the lotus effect: influence of double roughness structures and slender pillars.
  • N. Patankar
  • Materials Science, Medicine
    Langmuir : the ACS journal of surfaces and colloids
  • 2004
TLDR
It is proposed that double (or multiple) roughness structures or slender pillars are appropriate surface geometries to develop "self-cleaning" surfaces to mimic the microstructure of superhydrophobic leaves.
Is the lotus leaf superhydrophobic
Superhydrophobic surfaces have important technical applications ranging from self-cleaning window glasses, paints, and fabrics to low-friction surfaces. The archetype superhydrophobic surface is that
Super Water-Repellent Surfaces Resulting from Fractal Structure
Super water-repellent surfaces showing a contact angle of 174° for water droplets have been made of alkylketene dimer (AKD). Water droplets roll around without attachment on the super water-repellent
Modeling droplets on superhydrophobic surfaces: equilibrium states and transitions.
  • A. Dupuis, J. Yeomans
  • Chemistry, Medicine
    Langmuir : the ACS journal of surfaces and colloids
  • 2005
We present a lattice Boltzmann solution of the equations of motion describing the spreading of droplets on topologically patterned substrates. We apply it to model superhydrophobic behavior on
Ultrahydrophobic and Ultralyophobic Surfaces: Some Comments and Examples
The preparation of ultrahydrophobic and ultralyophobic surfaces using several techniques is described. Plasma polymerization of 2,2,3,3,4,4,4-heptafluorobutyl acrylate on poly(ethylene terephthalate)
Roughness-induced non-wetting
It is shown that a certain class of self-affine profiles of surface roughness may render any substrate with a non-zero microscopic contact angle non-wet, i.e., give it a macroscopic contact angle
Hydrophobic properties of a wavy rough substrate
TLDR
The critical drop pressure pW is calculated at which the Cassie state is no longer stable and the liquid jumps into full contact with the substrate (Wenzel state), and a simple criterion is proposed to calculate the minimum height asperity h necessary to prevent the Wenzel state from being formed, to preserve the super-Hydrophobic properties of the substrate, and, hence, to design a robust super-hydrophobic surface.
A multiscale molecular dynamics approach to contact mechanics
Abstract.The friction and adhesion between elastic bodies are strongly influenced by the roughness of the surfaces in contact. Here we develop a multiscale molecular dynamics approach to contact
Super-Repellent Composite Fluoropolymer Surfaces
Deposition of low surface energy plasma polymer layers onto microroughened PTFE substrates is found to give rise to high repellency toward polar and nonpolar probe liquids. This behavior has been
...
1
2
3
4
5
...