Delayed Freezing on Water Repellent Materials

Tourkine, Piotr; Merrer, Marie Le; Quéré, David

doi:10.1021/la900929u

Cited by 437 publications

(281 citation statements)

References 15 publications

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“…Kulinich and Farzaneh 75 discovered that CAH plays an important role in anti-freezing and a lower CAH normally contribute to a much longer delay of freezing time. 73,75 Compared with superhydrophobic surfaces, superamphiphobic surfaces normally exhibit much lower water CAH ( SA close to 1° 5 or even lower), as documented extensively. 9,25,46,47,60 Therefore, superamphiphobic surfaces are more promising in anti-freezing though the corresponding study in such an application for superamphiphobic surfaces has not yet been reported.…”

Section: Anti-freezingmentioning

confidence: 89%

“…Surface superhydrophobic modification shows great potential 75 to address such a challenge. Qué ré et al 73 demonstrated that freezing could remarkably be delayed when water droplets were deposited on cold superhydrophobic surfaces. It was reported that the presence of microtextures dramatically delay the freezing time of the water drops, by a factor between 3 and 5.…”

Section: Anti-freezingmentioning

confidence: 99%

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Superamphiphobic surfaces

2014

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Superamphiphobicity is an effect where surface roughness and surface chemistry combine to generate surfaces which are both superhydrophobic and superoleophobic, i.e., contact angles (yCA) greater than 1501 along with low contact angle hysteresis (CAH) not only towards probing water but also for low-surface-tension 'oils'. In this review, we summarize the research on superamphiphobic surfaces, including the characterization of superamphiphobicity, different techniques towards the fabrication of surface roughness and surface modification with low-surface-energy materials as well as their functional applications. Superamphiphobicity is an effect where surface roughness and surface chemistry combine to generate 5 surfaces which are both superhydrophobic and superoleophobic, i.e., contact angles ( CA ) greater than 150° along with low contact angle hysteresis (CAH) not only towards probing water but also for lowsurface-tension 'oils'. In this tutorial review, we summarize the research on superamphiphobic surfaces, including the characterization of superamphiphobicity, different techniques towards the fabrication of surface roughness and surface modification with low-surface-energy materials as well as their functional 10 applications.

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Section: Anti-freezingmentioning

confidence: 89%

Section: Anti-freezingmentioning

confidence: 99%

Superamphiphobic surfaces

2014

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“…71 Even surfaces that do not reduce adhesion of ice can depress the nucleation point significantly by increasing the free energy of nucleation. 72,73 Research has so far concentrated on treatments that can be easily applied to large technical surfaces and on PTFE, which has shown the lowest ice adhesion on flat surfaces, due to its low polarizability. The high polarity of water molecules means that induced dipoles are a major part of attachment forces on non-polar surfaces.…”

Section: Ice Resistancementioning

confidence: 99%

The superhydrophobicity of polymer surfaces: Recent developments

Shirtcliffe

McHale

Newton

2011

J Polym Sci B Polym Phys

168

108

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Superhydrophobicity is the extreme water repellence of highly textured surfaces. The field of superhydrophobicity research has reached a stage where huge numbers of candidate treatments have been proposed and jumps have been made in theoretically describing them. There now seems to be a move to more practical concerns and to considering the demands of individual applications instead of more general cases. With these developments, polymeric surfaces with their huge variety of properties have come to the fore and are fast becoming the material of choice for designing, developing, and producing superhydrophobic surfaces.

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“…Th e contents extend from a new processing route for surfaces to droplet behavior on the surface, including sliding [6,9,32-34], freezing [35][36][37], evaporation [25,[38][39][40] and bouncing [41][42][43]. However, such surfaces have not been put into practical use except in very limited cases.…”

Section: Superhydrophobic Surfacesmentioning

confidence: 99%

Design of hydrophobic surfaces for liquid droplet control

Nakajima

2011

NPG Asia Mater

142

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During rainfall, small water droplets can be observed to roll off hydrophobic umbrella surfaces at diff erent speeds. A droplet on a round hydrophobic surface does not always slide down on the surface easily at a small tilt angle, but even if it does, large moving acceleration is not always observed. What determines the motion of droplets on solid surfaces?Diff erences in droplet shape on solid surfaces are often explained by variations in wettability. Th e wetting of a solid surface has persisted through the ages as a research subject at the border between physics and chemistry. Wettability control of a solid against a liquid has been widely explored in industry for application in daily life because it can engender various physical and chemical phenomena related to solids and liquids. Wettability is an important property of solid surfaces from both fundamental and practical aspects. Th e degree of adhesion of liquid droplets onto a solid surface is commonly described in terms of the contact angle (θ), which is given by Young's equation aswhere γ sv , γ sl , and γ lv represent the interfacial free energies per unit area of the solid-gas, solid-liquid and liquid-gas interfaces. Although the defi nition and measurement of the contact angle are simple and easy, the nature of wettability is complex because it is related to three phases: solid, liquid and gas. Moreover, various factors aff ect the surface wettability of a solid. When one factor of a solid surface such as roughness is altered, other factors such as the surface topography or its chemical composition often change simultaneously. Th erefore, it is usually diffi cult to discuss the results of surface wettability obtained from experiments while retaining academic rigor. Th e main research interest for industrial materials is the behavior of millimeter-size droplets on a solid surface of more than a few centimeters in area. Th erefore, the discussion of wettability among samples with great diff erences in surface character is sometimes conducted with ignorance of the infl uence of other characteristics.Hydrophobic coatings are extremely important for wettability control. Th e coatings are anticipated for various industrial uses such as anti-wetting, anti-snow (or ice), anti-rust and reduced friction resistance by reducing solid-liquid interaction. Generally, a hydrophobic surface is one on which water forms a round droplet that is easily removed. Recent advances in probe microscopy and surface spectroscopy and the wider availability of such techniques have revealed that macroscopic surface hydrophobicity, especially dynamic hydrophobicity, is aff ected by nanolevel characteristics such as structure, chemical composition and their alignment and homogeneity. Th e expected properties for a hydrophobic surface cannot always be obtained unless precise design and control of the solid surface are applied. Th is report presents the results of recent studies on the design of hydrophobic surfaces for droplet removal or control from the viewpoint of materials science....

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Delayed Freezing on Water Repellent Materials

Cited by 437 publications

References 15 publications

Superamphiphobic surfaces

Superamphiphobic surfaces

The superhydrophobicity of polymer surfaces: Recent developments

Design of hydrophobic surfaces for liquid droplet control

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