Durability of superhydrophobic laser-treated metal surfaces under icing conditions

Vercillo, Vittorio; Cardoso, José Tiago; Huerta-Murillo, D.; Tonnicchia, Simone; Laroche, Alexandre; Guillén, Javier Alejandro Mayén; Ocaña, J.L.; Lasagni, Andrés Fabían; Bonaccurso, Elmar

doi:10.1016/j.mlblux.2019.100021

Cited by 17 publications

(19 citation statements)

References 23 publications

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“…Additionally, the real-to-projected area ratio Sdr was measured using a confocal microscope (Sensofar S Neox, Terrassa, Spain) with a 150× objective, resulting in vertical and lateral resolution of 2 nm and 140 nm. The surface roughness R z was measured with a benchtop stylus profiler (DektakXT, Bruker, Billerica, MA, USA), following the standard DIN ISO 25178 and DIN EN ISO 4287, respectively [ 50 , 51 ]. For acquiring the results, a stylus with a 2 µm diameter was pressed on the surface with a weight of 2 mg and moved at a speed of approx.…”

Section: Methodsmentioning

confidence: 99%

Icephobic Performance of Multi-Scale Laser-Textured Aluminum Surfaces for Aeronautic Applications

et al. 2021

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Ice-building up on the leading edge of wings and other surfaces exposed to icing atmospheric conditions can negatively influence the aerodynamic performances of aircrafts. In the past, research activities focused on understanding icing phenomena and finding effective countermeasures. Efforts have been dedicated to creating coatings capable of reducing the adhesion strength of ice to a surface. Nevertheless, coatings still lack functional stability, and their application can be harmful to health and the environment. Pulsed laser surface treatments have been proven as a viable technology to induce icephobicity on metallic surfaces. However, a study aimed to find the most effective microstructures for reducing ice adhesion still needs to be carried out. This study investigates the variation of the ice adhesion strength of micro-textured aluminum surfaces treated using laser-based methods. The icephobic performance is tested in an icing wind tunnel, simulating realistic icing conditions. Finally, it is shown that optimum surface textures lead to a reduction of the ice adhesion strength from originally 57 kPa down to 6 kPa, corresponding to a relative reduction of ~90%. Consequently, these new insights will be of great importance in the development of functionalized surfaces, permitting an innovative approach to prevent the icing of aluminum components.

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Section: Methodsmentioning

confidence: 99%

Icephobic Performance of Multi-Scale Laser-Textured Aluminum Surfaces for Aeronautic Applications

et al. 2021

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“…Additionally, the Ti64 surface chemically functionalized with a perfluoropolyether solution in a fluorinated solvent (MecaSurf, Surfactis Technologies, Angers, France) is still superhydrophobic after 16 icing/deicing cycles, while the nonfunctionalized laser‐treated Ti64 increases its wettability (static contact angle (CA) decreases from ≈170° to 120°) due to the removal of an adsorbed C‐rich layer on its surface. [ 42 ] However, to the best of our knowledge it has not yet been addressed which kind of microstructure (and therefore which laser technology) can produce superhydrophobic surfaces that also show icephobic properties in atmospheric icing conditions encountered during aircraft operations. To bridge this gap, this work investigates the adhesion strength of impact ice (i.e., ice generated in close to operation conditions in icing wind tunnel tests) on laser‐structured Ti64 superhydrophobic surfaces patterned employing three different laser techniques: direct laser writing (DLW), direct laser interference patterning (DLIP), and laser induced periodic surface structures (LIPSS), with pulse durations in the range of nanosecond to femtoseconds.…”

Section: Introductionmentioning

confidence: 99%

Design Rules for Laser‐Treated Icephobic Metallic Surfaces for Aeronautic Applications

Vercillo

Tonnicchia

Romano

et al. 2020

Adv Funct Materials

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130

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Ice accretion on external aircraft surfaces due to the impact of supercooled water droplets can negatively affect the aerodynamic performance and reduce the operational capability and, therefore, must be prevented. Icephobic coatings capable of reducing the adhesion strength of ice to a surface represent a promising technology to support thermal or mechanical ice protection systems. Icephobicity is similar to hydrophobicity in several aspects and superhydrophobic surfaces embody a straightforward solution to the ice adhesion problem. Short/ultrashort pulsed laser surface treatments are proposed as a viable technology to generate superhydrophobic properties on metallic surfaces. However, it has not yet been verified whether such surfaces are generally icephobic under representative icing conditions. This study investigates the ice adhesion strength on Ti6Al4V, an alloy commonly used for aerospace components, textured by means of direct laser writing, direct laser interference patterning, and laser-induced periodic surface structures laser sources with pulse durations ranging from nano-to femtosecond regimes. A clear relation between the spatial period, the surface microstructure depth, and the ice adhesion strength under different icing conditions is investigated. From these observations, a set of design rules can be defined for superhydrophobic surfaces that are icephobic, too.can reduce dramatically lift and increase drag, influencing the maneuverability of the aircraft. Ice protection systems (IPS) are installed to allow aircraft flying safely in icing conditions. At the present time, IPS are not supported by coatings or surfaces that facilitate the ice removal-due to the still too low maturity and robustness of such technological solutions. Yet, surface functionalization is a promising strategy for manufacturing icephobic surfaces [3] aiming to delay ice accretion and/ or to reduce ice adhesion [4,5] and therefore to reduce the electrical or thermal energy required by the IPS.In the last two decades, several approaches for producing icephobic surfaces were presented in literature. For example, it has been proven that polishing the surfaces can reduce the mechanical interlocking with the accreted ice, hence facilitating the ice removal. [5] Coatings can lower the surface free energy and thus reduce the strength of the bonding between ice and surface. [6] On slippery liquid-infused porous surfaces the supercooled water droplets impinge on a liquid instead of a solid surface, which offers a double advantage: interfacial slippage of water or ice occurs (nonzero slip velocity)-which reduces ice adhesion [7] -and interlocking of ice with a liquid interface cannot occur. However, employing coatings or chemicals to

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“… 20 , 21 , 27 Chemical etching is easily scalable 28 similar to other approaches for surface structuring of metals such as anodization, 29 coating application by spray 30 or immersion, 31 and laser-based methods. 32 However, it typically requires using hazardous chemicals such as strong acids and carcinogenic solvents, while a subsequent surface coating is also needed, typically involving the use of biopersistent polymers. 33 , 34 A few approaches using hot water baths to create nanostructures directly on metals have been reported.…”

Section: Introductionmentioning

confidence: 99%

Water-Based Scalable Methods for Self-Cleaning Antibacterial ZnO-Nanostructured Surfaces

Milionis

Tripathy

Donati

et al. 2020

Ind. Eng. Chem. Res.

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Bacterial colonization poses significant health risks, such as infestation of surfaces in biomedical applications and clean water unavailability. If maintaining the surrounding water clean is a target, developing surfaces with strong bactericidal action, which is facilitated by bacterial access to the surface and mixing, can be a solution. On the other hand, if sustenance of a surface free of bacteria is the goal, developing surfaces with ultralow bacterial adhesion often suffices. Here we report a facile, scalable, and environmentally benign strategy that delivers customized surfaces for these challenges. For bactericidal action, nanostructures of inherently antibacterial ZnO, through simple immersion of zinc in hot water, are fabricated. The resulting nanostructured surface exhibits extreme bactericidal effectiveness (9250 cells cm –2 h –1 ) that eliminates bacteria in direct contact and also remotely through the action of reactive oxygen species. Remarkably, the remote bactericidal action is achieved without the need for any illumination, otherwise required in conventional approaches. As a result, ZnO nanostructures yield outstanding water disinfection of >99.98%, in the dark, by inactivating the bacteria within 3 h. Moreover, Zn 2+ released to the aqueous medium from the nanostructured ZnO surface have a concentration of 0.73 ± 0.15 ppm, markedly below the legal limit for safe drinking water (5–6 ppm). The same nanostructures, when hydrophobized (through a water-based or fluorine-free spray process), exhibit strong bacterial repulsion, thus substantially reducing bacterial adhesion. Such environmentally benign and scalable methods showcase pathways toward inhibiting surface bacterial colonization.

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Durability of superhydrophobic laser-treated metal surfaces under icing conditions

Cited by 17 publications

References 23 publications

Icephobic Performance of Multi-Scale Laser-Textured Aluminum Surfaces for Aeronautic Applications

Icephobic Performance of Multi-Scale Laser-Textured Aluminum Surfaces for Aeronautic Applications

Design Rules for Laser‐Treated Icephobic Metallic Surfaces for Aeronautic Applications

Water-Based Scalable Methods for Self-Cleaning Antibacterial ZnO-Nanostructured Surfaces

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