A thermodynamic approach for determining the contact angle hysteresis for superhydrophobic surfaces

Li, W.; Amirfazli, Alidad

doi:10.1016/j.jcis.2005.05.062

Cited by 274 publications

(227 citation statements)

References 30 publications

Supporting

Mentioning

214

Contrasting

Unclassified

Order By: Relevance

“…The authors found that only when the receding contact angle is above 135°, the surface can be defined as superhydrophobic and the drop slides. The proposed limit is also close to the value 138·6°, which was identified using a theoretical model by Li and Amirfazli,24 as the minimum receding contact angle on a pillar-like surface.…”

supporting

confidence: 78%

Assessing durability of superhydrophobic surfaces

Malavasi

Bernagozzi

Antonini

et al. 2015

Surface Innovations

View full text Add to dashboard Cite

Superhydrophobic surfaces (SHS) show remarkable water repellency properties, and their use may have a tremendousimpact for a plethora of applications, where liquid water accumulation needs to be controlled or minimised. However, the durability of SHS in operational conditions is a severe issue that currently represents a bottleneck for the technology transfer from laboratory to industrial applications. In the present work, we try to fill in the gap caused by the absence of a standard for evaluation for SHS durability, by developing a protocol for testing surface durability.The proposed protocol includes nine tests as follows: water immersion, acidic environment, alkaline environment, ionic solution, mechanical erosion, ultraviolet exposure, resistance to heating, alcohol immersion and hydrocarbon immersion. The protocol can serve to give an indication of surface robustness in a variety of potentially harmful environments, by providing a global figure of merit and ranking for different SHS and thereby allowing for identifying those surfaces fulfilling requirements for a specific application. To illustrate the protocol, we tested a SHS developed in-house by grafting of lauric acid molecules on an aluminum substrate. This article contains supporting information that is available online.

show abstract

supporting

confidence: 78%

Assessing durability of superhydrophobic surfaces

Malavasi

Bernagozzi

Antonini

et al. 2015

Surface Innovations

View full text Add to dashboard Cite

show abstract

“…This leads to contact angle hysteresis, the difference between the larger contact angle at the front and the smaller contact angle at the rear of a moving droplet. There are various thermodynamic theories predicting the values of contact angle hysteresis [39][40][41][42][43][44]. …”

Section: Self-organized Criticality and Hysteresis Of The Contact Anglementioning

confidence: 99%

Anti-Icing Superhydrophobic Surfaces: Controlling Entropic Molecular Interactions to Design Novel Icephobic Concrete

Ramachandran

Kozhukhova

Соболев

et al. 2016

Entropy

View full text Add to dashboard Cite

Abstract:Tribology involves the study of friction, wear, lubrication, and adhesion, including biomimetic superhydrophobic and icephobic surfaces. The three aspects of icephobicity are the low ice adhesion, repulsion of incoming water droplets prior to freezing, and delayed frost formation. Although superhydrophobic surfaces are not always icephobic, the theoretical mechanisms behind icephobicity are similar to the entropically driven hydrophobic interactions. The growth of ice crystals in saturated vapor is partially governed by entropically driven diffusion of water molecules to definite locations similarly to hydrophobic interactions. The ice crystal formation can be compared to protein folding controlled by hydrophobic forces. Surface topography and surface energy can affect both the icephobicity and hydrophobicity. By controlling these properties, micro/nanostructured icephobic concrete was developed. The concrete showed ice adhesion strength one order of magnitude lower than regular concrete and could repel incoming water droplets at´5˝C. The icephobic performance of the concrete can be optimized by controlling the sand and polyvinyl alcohol fiber content.

show abstract

“…For the lotus leaf, the combination of wax and bumps leads to a high value of CA of 1628 . A number of studies have been carried out to produce artificial biomimetic roughness-induced hydrophobic surfaces (Shibuichi et al 1996;Hozumi & Takai 1998;Coulson et al 2000;Miwa et al 2000;Oner & McCarthy 2000;Feng et al 2002;Erbil et al 2003;Lau et al 2003;Burton & Bhushan 2005;Li & Amirfazli 2005;. Hydrophobic surfaces can be designed by using low surface energy materials or coatings, such as polytetrafluoroethylene or wax.…”

Section: Introductionmentioning

confidence: 99%

Towards optimization of patterned superhydrophobic surfaces

Bhushan

Nosonovsky

Jung

2007

J. R. Soc. Interface.

137

View full text Add to dashboard Cite

Experimental and theoretical study of wetting properties of patterned Si surfaces with cylindrical flat-top pillars of various sizes and pitch distances is presented. The values of the contact angle (CA), contact angle hysteresis (CAH) and tilt angle (TA) are measured and compared with the theoretical values. Transition from the composite solid-liquid-air to the homogeneous solid-liquid interface is investigated. It is found that the wetting behaviour of a patterned hydrophobic surface depends upon a simple non-dimensional parameter, the spacing factor, equal to the pillar diameter divided by the pitch. The spacing factor controls the CA, CAH and TA in the composite interface regime, as well as destabilization and transition to the homogeneous interface. We show that the assumption that the CAH is a consequence of the adhesion hysteresis and surface roughness leads to the theoretical values of the CAH that are in a reasonably good agreement with the experimental values. By decreasing the spacing factor, the values of CAZ1708, CAHZ58 and TAZ38 are achieved. However, with further decreasing of the spacing factor, the composite interface destabilizes.

show abstract

A thermodynamic approach for determining the contact angle hysteresis for superhydrophobic surfaces

Cited by 274 publications

References 30 publications

Assessing durability of superhydrophobic surfaces

Assessing durability of superhydrophobic surfaces

Anti-Icing Superhydrophobic Surfaces: Controlling Entropic Molecular Interactions to Design Novel Icephobic Concrete

Towards optimization of patterned superhydrophobic surfaces

Contact Info

Product

Resources

About