Hydrophilic to ultrahydrophobic transition of Al 7075 by affordable ns fiber laser and vacuum processing

Hauschwitz, Petr; Jagdheesh, R.; Rostohar, Danijela; Brajer, Jan; Kopeček, Jaromı́r; Jiřı́ček, P.; Houdková, J.; Mocek, Tomáš

doi:10.1016/j.apsusc.2019.144523

Cited by 45 publications

(29 citation statements)

References 36 publications

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“…The chemisorption of non-polar hydrocarbons takes place quickly on the laser-induced structures under high vacuum replacing the reactive hydroxylated site (see Figure 9 discussion). As the passive layer of water molecules on –OH groups is almost absent under vacuum, adsorption of hydrocarbons sourced from the oil in the pumps becomes faster (Hauschwitz et al, 2019 ). A vacuum of 4.5 × 10 −5 mbar for 4 h suppresses the passivation of –OH sites with H 2 O molecules due to the absence of humidity in the chamber in comparison to the normal atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Expedited Transition in the Wettability Response of Metal Meshes Structured by Femtosecond Laser Pulses for Oil-Water Separation

et al. 2020

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Oil-water separation using super-wetting and the selective permeability of membranes for oil or water has great ecological and economic significance. We report on the transition of wettability response, from superhydrophilic underwater-superoleophobic to superhydrophobic-superoleophilic state, by nanostructuring stainless steel and copper meshes using ultrashort femtosecond laser pulses. Our approach is environment-friendly, chemical free, and efficient as it exploits the benefit of aging the processed samples in a high vacuum environment. We optimized the laser scanning parameters, mesh pore size, and aging conditions to produce membranes exhibiting an extraordinary separation efficiency of 98% for the oil-water mixture. A variation in the water and oil contact angles for different meshes is presented as a function of the laser scanning speed. Stainless steel meshes with 150 μm pore size and copper meshes with 100 μm pore size have demonstrated an excellent wettability response for oil and water phases. Vacuum aging causes rapid chemisorption of hydrocarbons on laser-structured surfaces in the absence of water molecules, rapidly transforming the wetting state from superhydrophilic to superhydrophobic.

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Section: Resultsmentioning

confidence: 99%

Expedited Transition in the Wettability Response of Metal Meshes Structured by Femtosecond Laser Pulses for Oil-Water Separation

et al. 2020

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“…For the wettability analysis selected structures were produced on the area of 6 mm × 6 mm including structures depicted in Figure 4 b,e,h,k,n,q which were produced by 5 and 20 pulses with a peak fluence of 0.33 J/cm 2 , 0.49 J/cm 2 and 0.65 J/cm 2 . Immediately after laser treatment, samples show hydrophilic properties due to the formation of high-temperature metal oxides which have a high affinity towards the water molecules leading to hydrophilic behaviour [ 30 ]. Ageing in ambient conditions for several days is conventionally used to transfer samples from hydrophilic to hydrophobic state [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…Immediately after laser texturing (in less than 15 min), samples were stored for 6 h in a vacuum chamber pumped down to 10 −4 Pa by HiPace 80 turbopump with backing Duo 3 rotary vane pump (Pfeiffer Vacuum Technology AG, Aßlar, Germany) to promote favourable chemical changes and decrease the transition time to reach hydrophobic state [ 30 ]. After that, samples were stored in plastic box in atmospheric conditions.…”

Section: Methodsmentioning

confidence: 99%

Towards Rapid Fabrication of Superhydrophobic Surfaces by Multi-Beam Nanostructuring with 40,401 Beams

et al. 2021

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Superhydrophobic surfaces attract a lot of attention due to many potential applications including anti-icing, anti-corrosion, self-cleaning or drag-reduction surfaces. Despite a list of attractive applications of superhydrophobic surfaces and demonstrated capability of lasers to produce them, the speed of laser micro and nanostructuring is still low with respect to many industry standards. Up-to-now, most promising multi-beam solutions can improve processing speed a hundred to a thousand times. However, productive and efficient utilization of a new generation of kW-class ultrashort pulsed lasers for precise nanostructuring requires a much higher number of beams. In this work, we introduce a unique combination of high-energy pulsed ultrashort laser system delivering up to 20 mJ at 1030 nm in 1.7 ps and novel Diffractive Laser-Induced Texturing element (DLITe) capable of producing 201 × 201 sub-beams of 5 µm in diameter on a square area of 1 mm2. Simultaneous nanostructuring with 40,401 sub-beams resulted in a matrix of microcraters covered by nanogratings and ripples with periodicity below 470 nm and 720 nm, respectively. The processed area demonstrated hydrophobic to superhydrophobic properties with a maximum contact angle of 153°.

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“…It may be necessary to have a surface that repels liquids such as car windscreens with rain, oil impregnating of mechanical parts, or a surface that has good wetting property [ 7 , 8 , 9 ]. A good wetting property means that a liquid can spread fully on the surface [ 10 , 11 , 12 ]. An example of the need for a good wetting property is for the adhesion bonding techniques [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Wetting and Adhesive Properties by Atmospheric Pressure Plasma Surface Treatment Methods and Investigation Processes on the Influencing Parameters on HIPS Polymer

Berczeli

Weltsch

2021

Polymers

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The development of bonding technology and coating technologies require the use of modern materials and topologies for the demanding effect and modification of their wetting properties. For the industry, a process modification process that can be integrated into a process is the atmospheric pressure of air operation plasma surface treatment. This can be classified and evaluated based on the wettability, which has a significant impact on the adhesive force. The aim is to improve the wetting properties and to find the relationship between plasma treatment parameters, wetting, and adhesion. High Impact PolyStyrene (HIPS) was used as an experimental material, and then the plasma treatment can be treated with various adjustable parameters. The effect of plasma parameters on surface roughness, wetting contact angle, and using Fowkes theory of the surface energy have been investigated. Seven different plasma jet treatment distances were tested, combined with 5 scan speeds. Samples with the best plasma parameters were prepared from 25 mm × 25 mm overlapping adhesive joints using acrylic/cyanoacrylate. The possibility of creating a completely hydrophilic surface was achieved, where the untreated wetting edge angle decreased from 88.2° to 0° for distilled water and from 62.7° to 0° in the case of ethylene glycol. The bonding strength of High Impact PolyStyrene was increased by plasma treatment by 297%.

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Hydrophilic to ultrahydrophobic transition of Al 7075 by affordable ns fiber laser and vacuum processing

Cited by 45 publications

References 36 publications

Expedited Transition in the Wettability Response of Metal Meshes Structured by Femtosecond Laser Pulses for Oil-Water Separation

Expedited Transition in the Wettability Response of Metal Meshes Structured by Femtosecond Laser Pulses for Oil-Water Separation

Towards Rapid Fabrication of Superhydrophobic Surfaces by Multi-Beam Nanostructuring with 40,401 Beams

Enhanced Wetting and Adhesive Properties by Atmospheric Pressure Plasma Surface Treatment Methods and Investigation Processes on the Influencing Parameters on HIPS Polymer

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