Anti‐Icing Property of Superhydrophobic Octadecyltrichlorosilane Film and Its Ice Adhesion Strength

Ge, Liang; Ding, Guifu; Wang, Hong; Yao, Jinrong; Cheng, Ping; Wang, Yan

doi:10.1155/2013/278936

Cited by 37 publications

(20 citation statements)

References 22 publications

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“…And then a drop of shear force down to zero follows. The difference between force dropping to non-zero and dropping to zero after the ice detachment verifies the liquid-like lubricating layer on LP-OG surface [32]. Dynamic sliding on PDMS surface shows a typical solid-like stick-slip friction characteristic.…”

Section: Science China Materialsmentioning

confidence: 67%

Organogel as durable anti-icing coatings

et al. 2015

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A durable organogel anti-icing material via swelling crosslinked poly(dimethylsiloxane) with liquid paraffin is reported. The surface of the organogel is covered by a thin released layer of paraffin due to the osmotic pressure, which acts as a lubricant and reduces the ice adhesion greatly. Results show that the ice adhesion on the surface of the organogel is as small as 1.7±1.2 kPa (at −30°C) and the low ice adhesion remains even when the temperature is lowered to −70°C. The surface with lubricating liquid paraffin layer exhibits excellent durability, as it shows an ultralow ice adhesion after 35 cycles of icing/deicing and 100 days of exposure in ambient environment.

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Section: Science China Materialsmentioning

confidence: 67%

Organogel as durable anti-icing coatings

et al. 2015

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“…In general, a significant reduction in ice adhesion strength (lower than hydrophobic materials) was observed for the majority of investigations. 7,[29][30][31][32][33][34][35][36][37] However, there were also a few studies that reported an increase in ice adhesion on a superhydrophobic surface as compared to hydrophilic samples. 38,39 These conflicting reports are hypothesized to be due to inconsistent ice accretion processes.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of these studies relied on "static" methods, which involve the placement and freezing of either a drop or water columns on superhydrophobic surfaces. 30,38,39 Although these methods do result in ice formation, they do not represent the typical process of aerospace ice accretion, i.e., the impingement and instantaneous nucleation of a cloud of super-cooled droplets (20-100 µm diameter) on aircraft surfaces in freezing environmental conditions. The dynamics of these two ice accretion processes are clearly different.…”

Section: Introductionmentioning

confidence: 99%

Ice Adhesion Strength on Hydrophobic and Superhydrophobic Coatings

Yeong

Loth

Sokhey

et al. 2014

6th AIAA Atmospheric and Space Environments Conference

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Superhydrophobic coatings have shown promise in reducing both ice accretion and accumulation on a surface. However, recent studies revealed conflicting reports of ice adhesion strength on superhydrophobic surfaces. Therefore, a comprehensive experiment was conducted to measure the ice adhesion strength of a variety of hydrophobic and superhydrophobic coatings by subjecting test substrates to a super-cooled spray consisting of 20 µm droplets in a walk-in cold chamber, and at an air temperature of -20°C. The accreted ice was then removed by pressurized air in a tensile direction for a mode-1 fracture. The relationships between surface wettability, roughness parameters and ice adhesion were then studied in detail. Results showed that for hydrophobic surfaces, a high contact angle and receding contact angle resulted in a lower ice adhesion strength. However, ice adhesion strength for superhydrophobic surfaces correlated weakly with receding contact angle. It was discovered that low surface autocorrelation lengths for superhydrophobic surfaces would result in low ice adhesion strength. This is due to the fact that closely spaced surface features create a high capillary pressure between the surface asperities to resist the penetration of impacting super-cooled droplets to result in ice formation at a Cassie wetting state. However, if the surface asperities are infiltrated with water droplets, the ice adhesion strength can be affected by secondary surface roughness parameters such as arithmetic mean roughness, kurtosis and skewness. Nomenclature 2τ= cohesive fracture energy ω = adhesive fracture energy υ = Poisson's ratio for ice A = area c = "defect" diameter h = ice accretion thickness E = Young's modulus of ice z = surface feature amplitude P c = critical ice fracture pressure S a = arithmetic surface roughness S sk = surface skewness S ku = surface kurtosis 2 S al = surface autocorrelation length S q = surface root mean square roughness t x = autocorrelation function in the x-direction t y = autocorrelation function in the y-direction

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“…In general, a significant reduction in ice adhesion strength (lower than hydrophobic materials) was observed for the majority of investigations. [107][108][109][110][111][112][113][114][115][116] However, there were also a few studies that reported an increase in ice adhesion on a superhydrophobic surface as compared to hydrophilic samples. 117,118 These conflicting reports are hypothesized to be due to inconsistent ice accretion processes.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of these studies relied on "static" methods, which involve the placement and freezing of either a drop or water columns on superhydrophobic surfaces. 108,117,118 Although these methods do result in ice formation, they do not represent the typical process of atmospheric ice accretion, i.e., the impingement and instantaneous nucleation of a cloud of super-cooled droplets (20-m in diameter) on target surfaces in freezing environmental conditions. The dynamics of these two ice accretion processes are clearly different.…”

Section: Introductionmentioning

confidence: 99%

Impinging Drops on Superhydrophobic Surfaces at Icing Conditions

Yeong

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Due to their excellent water repellent characteristics, superhydrophobic surfaces have been hypothesized to be icephobic. This is based on the premise that water droplets will be repelled from the surface before ice nucleation can occur. The icephobic nature of these surfaces provides an attractive solution to current icing problems that can occur in aerospace applications. However, significant challenges remain before anti-wetting coatings could be implemented as an effective ice mitigation tool. For example, the majority of current synthetic superhydrophobic surfaces are fragile and unable to withstand the harsh environmental conditions that are encountered by aerospace applications. In addition, their static and dynamic wettability at varying temperatures and humidity, as well as their ice-shedding performance under the impact of a super-cooled icing cloud, are not well understood.Therefore, in this dissertation, fabrication techniques for a previously developed nanocomposite surface were improved so that coatings of consistent antiwetting performance and durability could be produced. The icephobicity of this nanocomposite coating was then systematically investigated. First, an experiment was conducted to study the wettability of a water drop on the coating for a full temperature cycle (20 -3The investigation was then extended to study the impact and rebound dynamics of a iv drop on an inclined coating, at different fluid viscosities and at various temperatures (50°C to -8°C). This was followed by a study of ice adhesion strength of the coatings -cooled water droplets. The receding contact angle was discovered from these experiments to be a key parameter in controlling superhydrophobic wettability and ice adhesion. Therefore, the receding angle depinning dynamics from a superhydrophobic surface were also studied in detail at micron length scales and at microsecond temporal scales. In summary, results from this dissertation revealed the crucial parameters that govern the icing performance of a nanocomposite superhydrophobic surface.

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Anti‐Icing Property of Superhydrophobic Octadecyltrichlorosilane Film and Its Ice Adhesion Strength

Cited by 37 publications

References 22 publications

Organogel as durable anti-icing coatings

Organogel as durable anti-icing coatings

Ice Adhesion Strength on Hydrophobic and Superhydrophobic Coatings

Impinging Drops on Superhydrophobic Surfaces at Icing Conditions

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