Water- and ice-repellent coatings

Saito, Hiroyuki; Takai, Kenichi; Yamauchi, Goro

doi:10.1007/bf02692637

Cited by 153 publications

(108 citation statements)

References 8 publications

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“…While no coating is perfectly icephobic, some have been developed from which ice shedding requires very little energy [2][3]. Good correlation between hydrophobicity and reduction of ice-adhesion has been reported [4][5]. Indeed, superhydrophobic surfaces (water contact angle θ > 150º) have shown promising antiicing performance [6].…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Jafari

Menini

Farzaneh

2010

Applied Surface Science

196

102

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A superhydrophobic and icephobic surface were investigated on aluminum alloy substrate.Anodizing was used first to create a micro-nano structured aluminum oxide underlayer on the alloy substrate. In a second step, the rough surface was coated with RF-sputtered polytetrafluoroethylene (PTFE or Teflon®). Scanning electron microscopy images showed a "bird's nest"-like structure on the anodized surface. The RF-sputtered PTFE coating exhibited a high static contact angle of ~ 165º with a very low contact angle hysteresis of ~ 3º. X-ray photoelectron spectroscopy (XPS) results showed high quantities of CF 3 and CF 2 groups, which are responsible for the hydrophobic behavior of the coatings. The performance of this superhydrophobic film was studied under atmospheric icing conditions. These results showed that on superhydrophobic surfaces ice adhesion strength was 3.5 times lower than on the polished aluminum substrate.

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Section: Introductionmentioning

confidence: 99%

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Jafari

Menini

Farzaneh

2010

Applied Surface Science

196

102

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“…The design and use of surfaces/coatings with minimum ice adherence and reduced ice accumulation is still actively considered as the most appealing and universal approach to the problem [3,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Most of the existing studies on anti-ice surfaces are focused on the reduction of ice adhesion strength [1,[5][6][7][8]10,[19][20][21][22][23][24] or delayed ice nucleation/formation [3,9,12,13,23,25,26]. Therefore lately the research in this area has been chiefly focused on the use and development of superhydrophobic surfaces (SHSs) for preventing ice formation and accumulation [4,[9][10][11][13][14][15][16][17][18][19]…”

mentioning

confidence: 99%

“…Most of the existing studies on anti-ice surfaces are focused on the reduction of ice adhesion strength [1,[5][6][7][8]10,[19][20][21][22][23][24] or delayed ice nucleation/formation [3,9,12,13,23,25,26]. Therefore lately the research in this area has been chiefly focused on the use and development of superhydrophobic surfaces (SHSs) for preventing ice formation and accumulation [4,[9][10][11][13][14][15][16][17][18][19][20][21][22][23][25][26][27][28][29]. Significantly delayed ice formation [3,10,12,13,15,16,23,26] and reduced ice adhesion or accumulation [3,…”

mentioning

confidence: 99%

“…Therefore lately the research in this area has been chiefly focused on the use and development of superhydrophobic surfaces (SHSs) for preventing ice formation and accumulation [4,[9][10][11][13][14][15][16][17][18][19][20][21][22][23][25][26][27][28][29]. Significantly delayed ice formation [3,10,12,13,15,16,23,26] and reduced ice adhesion or accumulation [3,10,[15][16][17]19,21,25] have been reported for various SHSs. Theoretical models have also been developed, demonstrating how SHSs can delay ice formation from impinging water droplets [9,11,13], which is in good agreement with experimental work [3,14,25,26].…”

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confidence: 99%

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The icephobic performance of alkyl-grafted aluminum surfaces

et al. 2015

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Abstract. The work analyzes the anti-icing performance of flat aluminum surfaces coated with widely used alkyl-group based layers of octadecyltrimethoxysilane, fluorinated alkylsilane and stearic acid as they are subjected to repeated icing/deicing cycles. The wetting properties of the samples upon long-term immersion in water are also evaluated. The results demonstrate that smooth aluminum surfaces grafted with alkyl groups are prone to gradual degradation of their hydrophobic and icephobic properties, which is caused by interaction and reactions with both ice and liquid water. This implies that alkyl-group based monolayers on aluminum surfaces are not likely to be durable icephobic coatings unless their durability in contact with ice and/or water is significantly improved.

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“…Dans les cas des interactions à longue portée (>0,3 nm), il est plutôt question des forces de van der Waals. L'adhésion de la glace peut aussi être due à l'ancrage mécanique à l'interface entre la glace et le matériau [17][18]. La littérature révèle qu'à l'interface glace/matériau, une combinaison de quatre facteurs est impliquée dans cette adhésion [19][20], On cite notamment les forces électrostatiques, les forces de van der Waals, les liaisons hydrogène et l'ancrage mécanique.…”

Section: Travaux Antérieursunclassified

Contribution à l'étude des mécanismes de l'adhésion de la glace à différents matériaux et application à l'évaluation des matériaux glaciophobes /

Ghalmi¹

2013

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Several Nordic countries with cold climates like Canada are often subjected to ice storms causing major economic and social losses. Ice or sticky snow adhesion on power network equipment can be a significant issue in transmission and distribution of electrical energy for companies operating in these regions. The costs of such events can be substantial, particularly due to the cessation of economic activities, equipment failures, deicing techniques (active methods), and population safety. Because of such events, power companies have understood the need to develop so-called superhydrophobic and/or icephobic surfaces, which can significantly reduce ice adhesion (passive methods). Several studies have led to the development of a variety of new nanostructured surfaces using various strategies. These studies have led to the design of superhydrophobic surfaces with contact angles greater than 150 and low ice adhesion strength.In order to optimally reduce the ice adhesion strength on different substrates, better understanding of the various mechanisms involved in the icing process is essential. It is in this context and within the framework of Canada's research chair on atmospheric icing of power networks (INGIVRE) that this thesis was carried out, aiming to improve the knowledge of atmospheric icing, and explain the forces involved at the ice/substrate interface. Furthermore, the effect of contact angle, surface roughness and porosity on icing and ice/substrate interface was investigated.This study clearly showed that the electrostatic, van der Waals and hydrogen bond forces are the main contributors to ice adhesion to a surface at the molecular level. The electrostatic energy, based on the principle of image charge, depends on the type of material in contact with the ice, the distance between the ice and the material, and the types of ice surface defects. The van der Waals energy depends on the material type, the thickness of the liquid water layer, and the temperature. For its part, the energy associated with hydrogen bonds depends on the material type, temperature, droplet mass, as well as on IV the static and sliding contact angles. Among these three forces, the electrostatic energy is the largest. Whereas the hydrogen bond energy is larger than the van der Waals energy. However, the latter is always present as long as ice is in contact with a solid surface.The experimental study showed that ice adhesion strength depends on the surface roughness of the substrate. In the case of metals with a thin natural protective oxide layer, higher roughness leads to higher ice adhesion strength. In other words, polished metallic surfaces exhibit lower ice adhesion strengths. However, in the case of anodized aluminum surfaces coated with PTFE, the roughened needle-like structure resulted in lower ice adhesion. The experimental results showed that PTFE coatings remain resistant to icing/deicing cycles. Even after 15 icing/deicing cycles, surfaces remain hydrophobic with a static contact angle greater than 130°. LISTE ...

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Water- and ice-repellent coatings

Cited by 153 publications

References 8 publications

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

Superhydrophobic and icephobic surfaces prepared by RF-sputtered polytetrafluoroethylene coatings

The icephobic performance of alkyl-grafted aluminum surfaces

Contribution à l'étude des mécanismes de l'adhésion de la glace à différents matériaux et application à l'évaluation des matériaux glaciophobes /

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