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

Safaee, Alireza

doi:10.1522/030112159

Cited by 5 publications

(7 citation statements)

References 146 publications

(196 reference statements)

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“…These surfaces have a number of practical applications in various areas such as cleaning coatings [31], biomédical [10], anti-icing [30,32,33], anti-fouling [34,35] and anticorrosion [32], anti-sticking surfaces [36], anti-contamination of glass surfaces such as windows in buildings and windshields in vehicles [37]. Several studies showed a good correlation between hydrophobicity, especially superhydrophobicity and icephobicity of surfaces [7,30,32,[38][39][40][41][42][43]. Hence, the fabrication of hydrophobic and superhydrophobic surfaces has much promise in anti-icing application.…”

Section: IImentioning

confidence: 99%

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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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Section: IImentioning

confidence: 99%

“…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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“…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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“…The chemical bath deposition method has recently seen widespread use for the purpose of preparing uniform thin films on flat substrates at room temperature. Even though a number of these organic coatings, including stearic acid, or FAS-13, [183,186] was previously examined in this laboratory, nevertheless, the systematic study of hydrophobic properties, the stability of these coatings under water for long periods of time, the icephobic behavior during several icing/de-icing events and hydrophobicity following several icing/de-icing cycles has not yet been undertaken formally. These parts are scarce; this research work was thus carried out to investigate the previously mentioned properties on coated Al surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…For further details regarding this series of experiments and the tools used, kindly refer to Chapter 4. This sample was expected not to be mechanically strong as its rough structures were based on relatively loose Ag nanoparticles sintered during annealing to better bond to each other followed by passivating the final rough structure with a thin fluoropolymer later [183,187]. Alkylsilane coated flat surfaces show higher adhesion strengths of-195 kPa compared to the nano-particle-based coated surfaces displaying strengths of ~55 to 60 kPa.…”

Section: Introductionmentioning

confidence: 99%

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Farhadi¹

2010

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Ice and wet-snow accretion on outdoor structures, including power transmission and distribution equipment, is a serious problem for regions experiencing icing conditions.Various de-icing and anti-icing techniques have been developed to date to counter this problem. Most of the techniques currently in use, however, including active de-icing methods, are employed only where accumulations are substantial. Passive approaches to the problem such as anti-icing or icephobic coatings which inhibit or retard ice accumulation on the surfaces are gaining in popularity.Metal corrosion should also be taken into account since metal or metallic alloys are subject to corrosion problems when placed in a humid or aggressive environment; the development of any ice-releasing coatings on Al structures, as they must be durable enough, is thus closely related to anti-corrosive protection of that specific metal.Consequently, this research has made an attempt to prepare coatings, either one layer or multi-layer, for use on polished AA6061 and AA2024 substrates combining the qualities of reduced ice adhesion and improved corrosion resistance. These two alloys are among the most widely used aluminium alloys in transportation systems (including aircraft), electric power industry, military, etc. Both the stability of the coatings in a humid environment and their overall ice-repellent performance was systematically studied.This research work has made a systematic approach to investigating the influence of surface roughness on the ice-releasing potential and the hydrophobic properties of the prepared coating surfaces. All coatings displayed a gradual loss of their hydrophobic properties after ~ 1000 h of immersion in water, and while corrosion of surfaces was also observed, except in the case of surfaces treated with permanganate conversion coatings which provided satisfactory anti-corrosive protection. IllAll flat coated surfaces demonstrated shear stress of ice detachment values which were at least ~ 1.5 times lower than uncoated mirror-polished Al surfaces and about ~ 2 times lower than those observed on as-received Al surfaces. The adhesion reduction factor (ARF) values decreased after as many as 12 icing/de-icing events, implying a certain amount of decay of the coatings.All rough superhydrophobic samples allowed for ice adhesion shear stress values of at least ~ 4 to 7 times lower than those obtained on the uncoated as-received Al surfaces. After 24 icing/de-icing experiments, however, ice adhesion strength increased significantly on those surfaces by a factor of ~ 2 after 24 icing/de-icing cycles.In addition, all flat and rough-coated surfaces gradually lost their hydrophobic properties after nearly each icing/de-icing cycle. Thus, the ice-releasing ability of all samples tested was found to be time-dependent.The work thus reveals that it is possible to prepare coatings which provide the reduced adhesion of ice to Al surfaces, while at the same time also providing some degree of anticorrosive protection.

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

Cited by 5 publications

References 146 publications

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

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 /

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

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