Influence of ambient conditions on the evolution of wettability properties of an IR-, ns-laser textured aluminium alloy

“…Modification of surface chemistry together with activation and adsorption of hydrocarbon molecules by the resulting organic layer could explain this phenomenon [27,42,44]. The storage condition of the laser-textured samples also plays an important role in the aging process [34].…”

Section: Surface Functionalitymentioning

confidence: 99%

Triangular laser-induced submicron textures for functionalising stainless steel surfaces

Romano

García‐Girón

Penchev

et al. 2018

Applied Surface Science

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“…The material removal takes place locally at the zone where the laser beam is interacting with the substrate and also causes a limited chemical surface modification. [ 27 ] From an industrial point of view, S/US pulsed laser technologies are very flexible and allow to treat a wide range of materials as long as the substrate absorbs the used laser wavelength (i.e., infrared (IR) and visible (VIS) for metals [ 28,29 ] and ultraviolet (UV) for polymers [ 30 ] ). In addition, the scale‐up of such technologies for industrial applications has been already demonstrated in several cases.…”

Section: Introductionmentioning

confidence: 99%

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

Vercillo

Tonnicchia

Romano

et al. 2020

Adv Funct Materials

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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“…This route to fabricate micropatterns, nanoripples or dual-scale structures has been investigated by many researchers. However, the evolution of their respective surface chemistry in ambient air or storage conditions is less studied while it is of prime importance in retaining the attractive surface functionality for as long as possible [9][10][11]. At the same time another indirect route for enhancing the hydrophobic properties of chemically stable polymers is gaining importance, especially through the use of well-established replication processes to transfer laser-fabricated surface textures/structures on tooling inserts onto thermoplastic parts [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mechanical durability of hydrophobic surfaces fabricated by injection moulding of laser-induced textures

Romano

Gülçür

García‐Girón

et al. 2019

Applied Surface Science

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CitationRomano J-M, Gülçür M, Garcia-Giron A et al (2019) Mechanical durability of hydrophobic surfaces fabricated by injection moulding of laser-induced textures. Applied Surface Science. 476: 850-860. Rights ABSTRACT.The paper reports an investigation on the mechanical durability of textured thermoplastic surfaces together with their respective wetting properties. A range of laser-induced topographies with different aspect ratios from micro to nanoscale were fabricated on tool steel inserts using an ultrashort pulsed near infrared laser. Then, through micro-injection moulding the topographies were replicated onto polypropylene surfaces and their durability was studied systematically. In particular, the evolution of topographies on textured thermoplastic surfaces together with their wetting properties were investigated after undergoing a controlled mechanical abrasion, i.e.reciprocating dry and wet cleaning cycles. The obtained empirical data was used both to study the effects of cleaning cycles and also to identify cleaning procedures with a minimal impact on textured thermoplastic surfaces and their respective wetting properties. In addition, the use of 3D areal parameters that are standardised and could be obtained readily with any state-of-the-art surface characterisation system are discussed for monitoring the surfaces' functional response.

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Influence of ambient conditions on the evolution of wettability properties of an IR-, ns-laser textured aluminium alloy

Cited by 107 publications

References 46 publications

Triangular laser-induced submicron textures for functionalising stainless steel surfaces

Triangular laser-induced submicron textures for functionalising stainless steel surfaces

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

Mechanical durability of hydrophobic surfaces fabricated by injection moulding of laser-induced textures

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