Silicone nanofilaments grown on aircraft alloys for low ice adhesion

Laroche, Alexandre; Bottone, Davide; Seeger, Stefan; Bonaccurso, Elmar

doi:10.1016/j.surfcoat.2021.126971

Cited by 18 publications

(12 citation statements)

References 54 publications

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“…1f-g. The fact that the Si signal does not appear to be specifically associated with the coral-like stalks of the SNFs points out the presence of a polysilsesquioxane underlayer below the SNFs, as already observed for other DAGS-derived coating 47 . Moreover, EDX mapping of F on f-SNFs, shown in Fig.…”

Section: Resultssupporting

confidence: 61%

“…In addition to that, the values measured for SLIPS (LS and LF) lay between 10 and 20 kPa, and fall within the range observed for slippery and lubricated surfaces tested using the same IWiT and testing method 35,36,48,51 . Notably, although a direct comparison is not possible, LS and LF show values close to those observed for SLIPS with other characterization methods relative to reference surfaces 33,34,47 .…”

Section: Ice Adhesion Testingsupporting

confidence: 58%

“…However, the homogeneous distribution of Si observed from the EDX map of sample S, shown in Fig. 3i, points out that the polysilsesquioxane underlayer beneath the SNFs withstands the aggressive cycling, as observed for DAGS-derived coatings on other substrates 47 . On the other hand, the F EDX map of sample F after ice adhesion testing (Fig.…”

Section: Ice Adhesion Testingmentioning

confidence: 79%

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Coral-like silicone nanofilament coatings with extremely low ice adhesion

Bottone

Donadei

Niemelä

et al. 2021

Sci Rep

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Passive icephobic surfaces can provide a cost and energy efficient solution to many icing problems that are currently handled with expensive active strategies. Water-repellent surface treatments are promising candidates for this goal, but commonly studied systems, such as superhydrophobic surfaces and Slippery Liquid Infused Porous Surfaces (SLIPS), still face challenges in the stability and durability of their properties in icing environments. In this work, environmental icing conditions are simulated using an Icing Wind Tunnel, and ice adhesion is evaluated with a Centrifugal Adhesion Test. We show that superhydrophobic coral-like Silicone Nanofilament (SNF) coatings exhibit extremely low ice adhesion, to the point of spontaneous ice detachment, and good durability against successive icing cycles. Moreover, SNFs-based SLIPS show stably low ice adhesion for the whole duration of the icing test. Stability of surface properties in a cold environment is further investigated with water wettability at sub-zero surface temperature, highlighting the effect of surface chemistry on superhydrophobicity under icing conditions.

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Section: Resultssupporting

confidence: 61%

Section: Ice Adhesion Testingsupporting

confidence: 58%

Section: Ice Adhesion Testingmentioning

confidence: 79%

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Coral-like silicone nanofilament coatings with extremely low ice adhesion

Bottone

Donadei

Niemelä

et al. 2021

Sci Rep

Self Cite

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“…However, the durability is still an issue in anti-icing materials [ 74 , 75 ]. In order to address the durability of the coatings, the samples were exposed repetitively to the entire accretion–detach process with the intention of evaluating how many of these cycles can be withstood before degradation.…”

Section: Resultsmentioning

confidence: 99%

Icephobic and Anticorrosion Coatings Deposited by Electrospinning on Aluminum Alloys for Aerospace Applications

et al. 2021

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Anti-icing or passive strategies have undergone a remarkable growth in importance as a complement for the de-icing approaches or active methods. As a result, many efforts for developing icephobic surfaces have been mostly dedicated to apply superhydrophobic coatings. Recently, a different type of ice-repellent structure based on slippery liquid-infused porous surfaces (SLIPS) has attracted increasing attention for being a simple and effective passive ice protection in a wide range of application areas, especially for the prevention of ice formation on aircrafts. In this work, the electrospinning technique has been used for the deposition of PVDF-HFP coatings on samples of the aeronautical alloy AA7075 by using a thickness control system based on the identification of the proper combination of process parameters such as the flow rate and applied voltage. In addition, the influence of the experimental conditions on the nanofiber properties is evaluated in terms of surface morphology, wettability, corrosion resistance, and optical transmittance. The experimental results showed an improvement in the micro/nanoscale structure, which optimizes the superhydrophobic and anticorrosive behavior due to the air trapped inside the nanotextured surface. In addition, once the best coating was selected, centrifugal ice adhesion tests (CAT) were carried out for two types of icing conditions (glaze and rime) simulated in an ice wind tunnel (IWT) on both as-deposited and liquid-infused coatings (SLIPs). The liquid-infused coatings showed a low water adhesion (low contact angle hysteresis) and low ice adhesion strength, reducing the ice adhesion four times with respect to PTFE (a well-known low-ice-adhesion material used as a reference).

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“…20 In recent years, CVD coating of (super)hydrophobic polysiloxane patterns around the entire surface of various chemistry and shape materials was performed to advance their surface antiwetting properties and chemistry for specific applications spanning from antifoulant textiles 5,21 to icephobic aircraft alloys. 22 Gas-phase growth of silicone micro and nanopatterns till today has been provided various shaped silicone nano-and microstructures, for instance, isotropic and superhydrophobic silicone nanofilaments (SNF), nanotubes, 23 stars, volcano, 24 and recently reported two-tier coatings of regular micro-rods (tier-1) surrounded by SNF (tier-2). 25 As reported previously by our group, the main factors defining the morphology of such (super)antiwetting silicone coatings in gas phase coatings are the (i) level of relative humidity and (ii) the temperature of the gas phase inside of the reaction chamber.…”

Section: Introductionmentioning

confidence: 99%

Droplet size assisted polysiloxane architecting

Varol

Seeger

2022

Preprint

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(Super)antiwetting shielding around engineering materials and protecting them against harsh environmental conditions has been achieved in recent years via growing various geometry polysiloxane (or silicone) patterns around them by using droplet assisted growth (DAGS) method, where the polymerization takes place inside of the water droplets acting as reaction vessels. The size and distribution of these reaction vessels are the main factors in making different geometry silicone patterns; however, very little is known about the fate of these droplets throughout the polymerization. Here, we proposed keeping the relative humidity (% RH) inside the reactor stable throughout the polymerization as a new coating parameter to force the size of the reaction vessel water droplets to be the same for building simple shape silicone rods with controlled geometry and distribution. In this manner, we grew simple geometry cylindric micro-rods on surfaces and could tune their length, diameter, inter-rod spacings, and thus the (super)hydrophobicity. Beyond fabricating simple geometry cylindrical micro rods, here, we also demonstrate that by changing the amplitude and the stability of the % RH, it is possible to fabricate different (super)hydrophobic nano-grasses, conical silicone micro-rods, and isotropic silicone nanofilaments (SNF). In the end, the proposed new way of tuning initial and in-situ reaction vessel droplet size can be used as a single factor to formulate different geometry silicone patterns with tunable dimensions, leading to different roughness and thus different degrees of hydrophobicity and superhydrophobicity. Due to its simplicity, silicone patterning with irregular spacing and size is preferred among other coating techniques, but the mathematical description of these irregular patterns is not trivial to explain their (super)hydrophobicity. To a certain extent, the droplet-size-assisted silicone shaping in this work provides a new way to control the length, diameter, morphology, inter-rod spacing, and thus the (super)hydrophobicity of the silicone patterns, especially those in the shape of simple cylindrical micro-rods. This control over silicone architecting will help to prepare new (super)hydrophobic coatings with more controlled morphology and thus wettability; on the other hand, it will support surface scientists modeling the connection between surface geometry and (super)antiwetting of such irregular pillared surfaces that remain elusive.

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Silicone nanofilaments grown on aircraft alloys for low ice adhesion

Cited by 18 publications

References 54 publications

Coral-like silicone nanofilament coatings with extremely low ice adhesion

Coral-like silicone nanofilament coatings with extremely low ice adhesion

Icephobic and Anticorrosion Coatings Deposited by Electrospinning on Aluminum Alloys for Aerospace Applications

Droplet size assisted polysiloxane architecting

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