Nanostructured thin films for icephobic applications =

Noormohammed, Saleema

doi:10.1522/030112137

Cited by 5 publications

(7 citation statements)

References 72 publications

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“…Therefore, the previously proposed hypothesis on the effect of the dielectric constant of the material coating [85] on the strength of ice adhesion on its surface was not confirmed in this work and may need further experimental tests to be verified.…”

Section: Discussionmentioning

confidence: 56%

Water and ice-repellent properties of nanocomposite coatings based on silicone rubber /

Arianpour¹

2010

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In cold-climate countries such as Canada, Norway, Russia, Finland, the USA, China and Japan, ice accumulation on power network equipment may cause serious problems resulting in power outages with socioeconomical consequences. This situation is caused roughly by mechanical line failures or insulator flashovers, involving several complex phenomena.Coating the surface of structures exposed to atmospheric icing with anti-icing materials can be an effective way to protect them against ice and snow adhesion and accretion. Coatings with water contact angle greater than 150° have been the subject of great interest during recent years. Such surfaces are called super-hydrophobic and are prepared by combining appropriate surface roughness with low surface energy.In the present work, flat and micro-/nano-rough water-repellent coatings based on silicone rubber incorporated with nanopowders of carbon-black, titania and ceria as dopants have been prepared and investigated. Such water-repellent coatings are potential candidates for protecting high-voltage equipment such as conductors and insulators.The water-repellent properties of the coatings were evaluated showing good incorporation of the dopant particles into silicone rubber. The anti-icing behaviour of the different coatings was studied under atmospheric icing conditions. Rough superhydrophobic coatings prepared with TiO2 and CeO2 nanoparticles of different dielectric constants ( TiO2.* ~80, CeC^: -60) resulted in reducing the ice adhesion strength of at least ~ 7 times compared to a mirror-polished aluminum sample and ~ 9 times compared to an as-received aluminum sample. IllFreezing behaviour of small water droplets was investigated on such nanostructured composite surfaces and compared with that on flat surfaces. At -15 °C, small water droplets were observed to freeze on polished Al after approximately 5 s, while their freezing was delayed to -12-13 min on super-hydrophobic nanocomposite surfaces. This is explained by the insulating properties of the rough surfaces which entrap a significant amount of air into their structure. Therefore, the coatings prepared show promise for industrial applications on high-voltage equipment, including insulators, since they can reduce ice accumulation, while also reducing the risk of flashover on overhead high-tension insulators. IV RésuméDans les pays à climat froid comme le Canada, la Norvège, la Russie, la Finlande, les États-Unis, la Chine et le Japon, l'accumulation de glace sur les équipements des réseaux électriques peut causer de sérieux problèmes résultant en des pannes d'électricité avec des conséquences socioéconomiques parfois désastreuses.

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Section: Discussionmentioning

confidence: 56%

Water and ice-repellent properties of nanocomposite coatings based on silicone rubber /

Arianpour¹

2010

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“…Therefore, between these types of atmospheric ice (glaze ice, hard and soft rime ice), glaze ice is denser and exerts stronger static/dynamic forces on the equipment [39,46].…”

Section: Ii-2-icephobicitymentioning

confidence: 99%

Development of nano-structured icephobic surfaces based on plasma polymerization /

Mobarakeh¹

2014

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Accumulated ice on exposed surfaces leads to operational difficulties and extensive maintenance for power transmission lines, antennas, aircraft, ships, and ground transportation vehicles.In the present study, the low pressure plasma polymerized Hexamethyldisiloxane (PP-HMDSO) film is deposited on aluminum surfaces to create a superhydrophobic coating with icephobic properties. Prior to the deposition of this low surface energy coating, aluminum surfaces were anodized or immersed in boiling water to make micro/nano structured surfaces.Plasma parameters were optimized in order to find the best optimum conditions for having high static contact angle and low contact angle hysteresis. Hence, the Grey-based Taguchi method was used as one of the Design of Experiment (DOE) techniques. The stability of coatings was studied under accelerated aging conditions such as UV degradation, immersion in distilled water and different pH solutions, and several icing/deicing cycles. It was observed that the PP-HMDSO coatings are quite stable against UV exposure and immersion in distilled water. However, the icephobicity of the PP-HMDSO coating deposited on the anodized aluminum decreased after fifteen icing/de-icing cycles.The stability of the developed coating was improved against several icing/de-icing cycles by increasing the deposition time of plasma polymerized coating from 15 to 25 minutes. The results showed that increasing the deposition time of plasma polymerization leads to decrease of the ice adhesion strength of coatings on anodized aluminum while it has no significant effect on the PP-HMDSO coating deposited on a water-treated aluminum surface. Finally, the superhydrophobic PP-HMDSO coating also provides anti-corrosion protection for the aluminum substrate.

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“…Des études ont été menées pour tenter de comprendre le rôle de la rugosité d'une surface solide sur l'adhésion de la glace en utilisant le concept de la superhydrophobicité [7,17,20], En présence de forts degrés de rugosité, une diminution de l'adhésion de la glace a été remarquée. Cette diminution est liée à la présence de bulles d'air à l'interface de la glace et du substrat [28][29][30][31][32][33]. 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.…”

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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Nanostructured thin films for icephobic applications =

Cited by 5 publications

References 72 publications

Water and ice-repellent properties of nanocomposite coatings based on silicone rubber /

Water and ice-repellent properties of nanocomposite coatings based on silicone rubber /

Development of nano-structured icephobic surfaces based on plasma polymerization /

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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