Icephobic surfaces: Definition and figures of merit

Irajizad, Peyman; Nazifi, Sina; Ghasemi, Hadi

doi:10.1016/j.cis.2019.04.005

Cited by 132 publications

(118 citation statements)

References 148 publications

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“…When there was no SAW power supplied, the ice‐nucleation at the solid surface followed the classical ice‐formation theory. [ 22,23 ] Due to the same environmental conditions (e.g., same temperature) and similar surface structure (e.g., roughness), for all the devices, the critical nucleolus radius, the critical free energy of ice nucleation, and nucleation rate (according to Equations () to ()) were maintained nearly as constants which led to similar icing times of around 50 s for all the devices without SAW power applied.…”

Section: Resultsmentioning

confidence: 99%

“…According to Equation (), the critical nucleolus radius at −10 °C is ≈4.74 nm, based on literature. [ 23 ] With the wavelength of SAW devices varying from 100 to 400 µm in this study, the values of κ change from 7.44 × 10 −5 to 29.8 × 10 −5 , which are far less than 1. This indicates that the ice nucleolus inside the liquid is mainly driven by acoustic streaming.…”

Section: Theorymentioning

confidence: 87%

“…The value of x

= \frac{R}{r_{c}}

depends on the radius of features at the surface ( R ) and the critical nucleolus radius ( r c ). Another key factor to evaluate the ice formation is the nucleation rate, J ( T ), which is given by [ 23 ]

\begin{matrix} J (T) = τ^{- 1} = K \exp (- \frac{normalΔ G^{*}}{k_{B} T}) \end{matrix}

where τ is the ice nucleation delay time, k B is the Boltzmann constant, K = ZβN is a kinetic constant which depends on the Zeldovich nonequilibrium factor ( Z ), the rate at which atoms or molecules are added to the critical nucleus (β), and the number of atomic nucleation sites per unit volume ( N ). According to Equations (), (), and (), the key factors of ice nucleation on the given structural surface are the temperature T and the surface factor f ( m , x ).…”

Section: Theorymentioning

confidence: 99%

See 2 more Smart Citations

Nanoscale “Earthquake” Effect Induced by Thin Film Surface Acoustic Waves as a New Strategy for Ice Protection

Yang

Tao

Hou

et al. 2020

Adv Materials Inter

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Ice accretion often poses serious operational and safety challenges in a wide range of industries, such as aircraft, wind turbines, power transmission cables, oil field exploration and production, as well as marine transport. Great efforts have been expended to research and develop viable solutions for ice prevention. Effective ice protection techniques, however, have yet to be developed. Ice prevention measures that are currently available often consume significant amounts of de‐icing chemicals or energy, and these approaches are expensive to operate and have long‐term economic and environmental impacts. Here, a new ice protective strategy based on thin film surface acoustic waves (SAWs) is proposed that generates: nanoscale “earthquake”‐like vibrations, acoustic streaming, and acousto‐heating effects, directly at the ice–structure interface, which actively and effectively delays ice nucleation and weakens ice adhesion on the structure surface. Compared with the conventional electro‐thermal de‐icing method, the SAW approach demonstrates much‐improved energy efficiency for ice‐removal. The potential for the dual capability of autonomous ice monitoring and removing functions using the SAW generation elements as transducers is also explored.

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Section: Resultsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 87%

“…The value of x

= \frac{R}{r_{c}}

\begin{matrix} J (T) = τ^{- 1} = K \exp (- \frac{normalΔ G^{*}}{k_{B} T}) \end{matrix}

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

Nanoscale “Earthquake” Effect Induced by Thin Film Surface Acoustic Waves as a New Strategy for Ice Protection

Yang

Tao

Hou

et al. 2020

Adv Materials Inter

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“… 7 , 21 Loss of the lubricant leads to increased ice-to-substrate contact and therefore, increased ice adhesion. 7 , 18 …”

Section: Introductionmentioning

confidence: 99%

Capillary Balancing: Designing Frost-Resistant Lubricant-Infused Surfaces

et al. 2020

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Slippery lubricant-infused surfaces (SLIPS) have shown great promise for antifrosting and anti-icing. However, small length scales associated with frost dendrites exert immense capillary suction pressure on the lubricant. This pressure depletes the lubricant film and is detrimental to the functionality of SLIPS. To prevent lubricant depletion, we demonstrate that interstitial spacing in SLIPS needs to be kept below those found in frost dendrites. Densely packed nanoparticles create the optimally sized nanointerstitial features in SLIPS (Nano-SLIPS). The capillary pressure stabilizing the lubricant in Nano-SLIPS balances or exceeds the capillary suction pressure by frost dendrites. We term this concept capillary balancing. Three-dimensional spatial analysis via confocal microscopy reveals that lubricants in optimally structured Nano-SLIPS are not affected throughout condensation (0 °C), extreme frosting (−20 °C to −100 °C), and traverse ice-shearing (−10 °C) tests. These surfaces preserve low ice adhesion (10−30 kPa) over 50 icing cycles, demonstrating a design principle for next-generation anti-icing surfaces.

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“…Structure of bis(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10-hexadecafluorodecyldimethylsiloxy) bis(hexyl dimethylsiloxy)tetrakis((trimethoxysilyl)ethyldimethylsiloxy)pentacyclo[9 .5.1.13,9.15,15.17,13]octasiloxane.…”

mentioning

confidence: 99%

Hybrid Modification of Unsaturated Polyester Resins to Obtain Hydro- and Icephobic Properties

et al. 2020

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Ice accumulation is a key and unsolved problem for many composite structures with polymer matrices, e.g., wind turbines and airplanes. One of the solutions to avoid icing is to use anti-icing coatings. In recent years, the influence of hydrophobicity of a surface on its icephobic properties has been studied. This solution is based on the idea that a material with poor wettability maximally reduces the contact time between a cooled drop of water and the surface, consequently prevents the formation of ice, and decreases its adhesion to the surface. In this work, a hybrid modification of a gelcoat based on unsaturated polyester resin with nanosilica and chemical modifiers from the group of triple functionalized polyhedral oligomeric silsesquioxanes (POSS) and double organofunctionalized polysiloxanes (generally called multi-functionalized organosilicon compounds (MFSC)) was applied. The work describes how the change of modifier concentration and its structural structure finally influences the ice phobic properties. The modifiers used in their structure groups lowered the free surface energy and crosslinking groups with the applied resin, lowering the phenomena of migration and removing the modifier from the surface layer of gelcoat. The main studies from the icephobicity point of view were the measurements of ice adhesion forces between modified materials and ice. The tests were based on the measurements of the shear strength between the ice layer and the modified surface and were conducted using a tensile machine. Hydrophobic properties of the obtained nanocomposites were determined by measurement of the contact angle and contact angle hysteresis. As the results of the work, it was found that the modification of gelcoat with nanosilica and multi-functionalized silicone compounds results in the improvement of icephobic properties when compared to unmodified gelcoat while no direct influence of wettability properties was found. Ice adhesion decreased by more than 30%.

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Icephobic surfaces: Definition and figures of merit

Cited by 132 publications

References 148 publications

Nanoscale “Earthquake” Effect Induced by Thin Film Surface Acoustic Waves as a New Strategy for Ice Protection

Nanoscale “Earthquake” Effect Induced by Thin Film Surface Acoustic Waves as a New Strategy for Ice Protection

Capillary Balancing: Designing Frost-Resistant Lubricant-Infused Surfaces

Hybrid Modification of Unsaturated Polyester Resins to Obtain Hydro- and Icephobic Properties

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