Wettability modification of laser-fabricated hierarchical surface structures in Ti-6Al-4V titanium alloy

Huerta-Murillo, D.; García‐Girón, Antonio; Romano, Jean–Michel; Cardoso, José Tiago; Cordovilla, Francisco; Walker, Marc; Dimov, Stefan Simeonov; Ocaña, José L.

doi:10.1016/j.apsusc.2018.09.012

Cited by 96 publications

(64 citation statements)

References 34 publications

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“…During the DLW and LIPSS processes, the laser beam is focused on the surface of the sample and the scanning of the beam textures a defined area. [ 43 ] LIPSS are self‐organized surface features usually generated with fluences close to or slightly above the ablation threshold. [ 44 ] By optimizing the energy transferred to the surface, sub‐micrometer features or hierarchical micro/nanoscale features can be fabricated.…”

Section: Introductionmentioning

confidence: 99%

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

Vercillo

Tonnicchia

Romano

et al. 2020

Adv Funct Materials

118

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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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Section: Introductionmentioning

confidence: 99%

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

Vercillo

Tonnicchia

Romano

et al. 2020

Adv Funct Materials

118

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“…In the recent decades, for the purpose of miniaturization, the fabrication of micro-and nano-structures with ultra-fine building blocks is highly demanding in modern industry. Therefore, versatile surfaces with considerable physical and chemical heterogeneities need to be either protected or decorated with nano-structures for functional properties, such as plasmonic enhancement [28], anti-refection [4], wettability tuning [29], dental implants [30]. With the capillary assembly, unique micro-and nano-structures are possible to reach these massive needs.…”

Section: Introductionmentioning

confidence: 99%

Capillary assembly of colloidal particles on patterned surfaces

et al. 2020

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Capillary attraction at the meniscus between tiny objects plays a crucial role in self-assembly processes. The shape of the meniscus governed by the Laplace equation devotes to a long-range attraction distinct to the DLVO defined forces. Rather than considering trapped particles on ideal smooth surfaces, we use patterned substrates with ordered nano-arrays for theoretical modeling toward the capillary assembly. The vertical elevation of particles is found to change the shape of the meniscus between particles, therefore the interaction energy and capillary force. A minimal model is developed to determine the capillary force between particles and thus the motility of particles, therefore the criterion of the crystallization of colloidal particles. It turns out that the formation of a colloidal crystal or amorphous medium depends on the optimization between the scaled particle separation by its size and the geometrical design of the supporting nano-arrays. Finally, we experimentally confirmed the capillary assembly from colloidal suspensions, by playing the control parameters defined in our theoretical model, with a nice agreement. This model system can mimic the practical applications of nano-structure fabrication on versatile real surfaces for functionality purposes.

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“…There are several reported works on nano/micro-texturing of different materials such as the improvement of cell adhesion in metallic bio-implants or tribological properties of mechanical components, self-cleaning, corrosion protection, and other applications [25,26]. The lasers used were short-pulse lasers [27][28][29][30][31][32] as well as ultra-short pulses [31,[33][34][35][36]. However, the application of laser texturing to modify the wettability of stones is scarce or even nonexistent [37,38].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Laser Surface Texturing: A Sustainable Tool to Modify Wettability Properties of Marble

et al. 2019

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Conservation strategies to reduce the degradation of stone caused by the action of water are focusing on increasing the hydrophobicity of the surface by imitating existing solutions in nature (lotus leafs and others). These are mainly based on the existence of hierarchical roughness with micro- and nanoscale structures. In the case of marble, research has focused on protective coatings that sometimes are dangerous for the health and the environment, and with undesirable effects such as color changes or reduction of water vapor permeability of the stone. Laser texturing, however, is an environmentally friendly technique, because no chemicals or toxic waste are added and, moreover, it can process nearly all types of materials. It has been used to change the surface texture of metals and other materials on a micro or even nanometric scale, to meet a specific functional requirement, such as hydrophobicity. The objective of this work was to analyze the feasibility of this technique to provide hydrophobic properties to a marble surface without appreciable changes in its appearance. Therefore, an analysis of the irradiation parameters with ultra-short-pulse laser was performed. Preliminary results demonstrate the ability of this technique to provide hydrophobic character the marble (contact angles well above 90 ∘ ). Besides, the analysis of the treated surfaces in terms of roughness, color and gloss indicates that changes in the appearance of the surface are minimal when properly selecting the process parameters.

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Wettability modification of laser-fabricated hierarchical surface structures in Ti-6Al-4V titanium alloy

Cited by 96 publications

References 34 publications

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

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

Capillary assembly of colloidal particles on patterned surfaces

Ultrafast Laser Surface Texturing: A Sustainable Tool to Modify Wettability Properties of Marble

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