Laser texturing of stainless steel under different processing atmospheres: From superhydrophilic to superhydrophobic surfaces

Pou, Pablo Jauralde; Val, J. del; Riveiro, A.; Comesaña, R.; Arias-González, F.; Lusquiños, F.; Bountinguiza, M.; Quintero, F.; Pou, J.

doi:10.1016/j.apsusc.2018.12.248

Cited by 99 publications

(42 citation statements)

References 39 publications

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“…This has led to interest into the effect of the atmosphere during the irradiation process itself on final wettability of the surface. Pou et al (2019) performed a study in which they streamed: air, Ar, N 2 , O 2 , and CO 2 onto the substrate during nanosecond laser irradiation. After irradiation, the samples were individually sealed in an air-filled bag for a week before analytical tests were performed.…”

Section: Introductionmentioning

confidence: 99%

The Tuning of LIPSS Wettability during Laser Machining and through Post-Processing

2021

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In this work, we investigate the fabrication of stainless-steel substrates decorated with laser-induced periodic surface structures (LIPSS) of both hydrophilic and hydrophobic wettability through different post-processing manipulation. In carrying out these experiments, we have found that while a CO2-rich atmosphere during irradiation does not affect final wettability, residence in such an atmosphere after irradiation does indeed increase hydrophobicity. Contrarily, residence in a boiling water bath will instead lead to a hydrophilic surface. Further, our experiments show the importance of removing non-sintered nanoparticles and agglomerates after laser micromachining. If they are not removed, we demonstrate that the nanoparticle agglomerates themselves become hydrophobic, creating a Cassie air-trapping layer on the surface which presents with water contact angles of 180. However, such a surface lacks robustness; the particles are removed with the contacting water. What is left behind are LIPSS which are integral to the surface and have largely been blocked from reacting with the surrounding atmosphere. The actual surface presents with a water contact angle of approximately 80. Finally, we show that chemical reactions on these metallic surfaces decorated with only LIPSS are comparatively slower than the reactions on metals irradiated to have hierarchical roughness. This is shown to be an important consideration to achieve the highest degree of hydro-philicity/phobicity possible. For example, repeated contact with water from goniometric measurements over the first 30 days following laser micromachining is shown to reduce the ultimate wettability of the surface to approximately 65, compared to 135when the surface is left undisturbed for 30 days.

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Section: Introductionmentioning

confidence: 99%

The Tuning of LIPSS Wettability during Laser Machining and through Post-Processing

2021

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“…Nitrogen (N 2 ) is a known shielding gas that helps to exclude oxygen from the processing zone, preventing metal oxidation. Although it is reactive at elevated temperatures, it forms only small amount of lattice nitrides at low gas pressures [28,29]. The spectral response of the steel surfaces structured in nitrogen show noticeable reduction in the emissivity compared to the in-air treated surface, as seen from Fig.…”

Section: Resultsmentioning

confidence: 90%

High-performance thermal emitters based on laser-engineered metal surfaces

Zolotovskaya¹,

Wackerow²,

Neupert³

et al. 2020

Opt. Mater. Express

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Effective thermal management is of paramount importance for all high-temperature systems operating under vacuum. Cooling of such systems relies mainly on radiative heat transfer requiring high spectral emissivity of surfaces, which is strongly affected by the surface condition. Pulsed laser structuring of stainless steel in air resulted in the spectral hemispherical emissivity values exceeding 0.95 in the 2.5–15 µm spectral region. The effects of surface oxidation and topography on spectral emissivity as well as high temperature stability of the surface structures were examined. High performance stability of the laser textured surfaces was confirmed after thermal aging studies at 320°C for 96 hours.

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“…Laser micro-and nanomachining can also be used to generate asperities on surfaces which behave as hydrophobic or superhydrophobic depending on the base material, the type of microstructure created, the processing atmosphere and the laser machining parameters. [57][58][59][60] Both laser-induced periodic surface structures (LIPSS) and unstructured bumps can be generated over surfaces using various kinds of pulse lasers, such as nano- 61 or femtosecond lasers, 62 and so on, just by varying various laser parameters. 63 Figure 22 shows SEM images of laser-patterned surfaces under different machining conditions.…”

Section: Multistep Processesmentioning

confidence: 99%

Superhydrophobic surfaces review: Functional application, fabrication techniques and limitations

Manoharan

Bhattacharya

2019

Journal of Micromanufacturing

137

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Over the years, researchers have been working to mimic the nature by inducing superhydrophobic properties into a variety of material surfaces so that they exhibit non-wetting properties. Many diverse applications have been found in the fields, such as space and aerospace, defence, automotive, biomedical applications and engineering, sensors, apparels, and so on. Superhydrophobic surfaces repel water generally due to their surface texture or chemical properties. In this article, we focus on the functional applications of the superhydrophobic surfaces, and state-of-the-art fabrication technologies and processes, and the limitations of these processes to generate the superhydrophobic surfaces have been developed over the years.

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Laser texturing of stainless steel under different processing atmospheres: From superhydrophilic to superhydrophobic surfaces

Cited by 99 publications

References 39 publications

The Tuning of LIPSS Wettability during Laser Machining and through Post-Processing

The Tuning of LIPSS Wettability during Laser Machining and through Post-Processing

High-performance thermal emitters based on laser-engineered metal surfaces

Superhydrophobic surfaces review: Functional application, fabrication techniques and limitations

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