Étude de l adhérence de la glace sur des solides à caractère glaciophobe

Laforte, Caroline

doi:10.1522/12599107

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The RMS roughness of whole surface was determined to be 191.25nm. This is a low degree of roughness compared with the reported values for other anti-icing candidate coatings, for example in [202]. Without coating, the RMS roughness was found to be ~115 nm using the optical profilometer.…”

Section: Effect Of Freezing-thawing Cycles On Passivation Layermentioning

confidence: 48%

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Nanostructured metal surfaces and their passivation for superhydrophobic and anti-icing applications =

Safaee¹

2008

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Section: Effect Of Freezing-thawing Cycles On Passivation Layermentioning

confidence: 48%

“…It worth mentioning that in the works of many researchers the meaning of reducing the surface energy by passivation have been expressed by hydrophobicity [202]. However, it has been found that there is no unique relation between ice adhesion strength and hydrophobicity.…”

Section: Effect Of Passivation On Not-coated Surfacesmentioning

confidence: 99%

Nanostructured metal surfaces and their passivation for superhydrophobic and anti-icing applications =

Safaee¹

2008

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“…Par ailleurs, la glace peut adhérer fortement à certaines surfaces car l'eau surfondue pénètre dans les zones poreuses et occupe plus de volume en se solidifiant, créant ainsi un effet d'ancrage mécanique au substrat. La littérature révèle que l'augmentation de la rugosité implique l'augmentation de la force d'adhérence de la glace [17,[34][35].…”

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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“…La rupture entre la glace et le substrat proviendrait alors des imperfections du réseau (Lliboutry, 1964). Dans plusieurs cas de rupture de la glace, on observe à la surface du substrat une mince couche de glace encore en place (C, Laforte, 2001; L.D., Minsk, 1982). La rupture serait donc plutôt cohesive qu'adhésive c'est-à-dire que la couche de glace se rupture au lieu de décoller de la surface.…”

Section: Mécanisme De Déformation Fragileunclassified

Déformation à la rupture adhésive par traction, flexion et torsion d'un substat givré /

Laforte¹

2008

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Étude de l adhérence de la glace sur des solides à caractère glaciophobe

Cited by 4 publications

References 5 publications

Nanostructured metal surfaces and their passivation for superhydrophobic and anti-icing applications =

Nanostructured metal surfaces and their passivation for superhydrophobic and anti-icing applications =

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

Déformation à la rupture adhésive par traction, flexion et torsion d'un substat givré /

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