High Throughput Direct Laser Interference Patterning of Aluminum for Fabrication of Super Hydrophobic Surfaces

Lang, Valentin; Voisiat, Bogdan; Lasagni, Andrés Fabían

doi:10.3390/ma12091484

Cited by 15 publications

(8 citation statements)

References 56 publications

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“…This results in more molten material, forming larger melt fronts and deeper line‐like structures. [ 37,45–48 ] For small spatial periods, it has been already reported that the temperature difference between interference maxima and minima is low, which causes a melting at both positions when high pulse energies or high pulse overlaps are used. Consequently, a loss of structure depth occurs after some number of pulses due to remelting, whereby the homogeneity of the line‐like patterns is reduced.…”

Section: Resultsmentioning

confidence: 99%

Scanner‐Based Direct Laser Interference Patterning on Stainless Steel

et al. 2021

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Direct laser interference patterning (DLIP) so far has been used almost exclusively in combination with mechanical translation stages reaching impressive throughputs for very specific configurations. As an alternative, DLIP modules can be combined with laser scanners, however presenting some limitations in comparison with standard static optical setups due to the limited possible spatial separation between the interfering beams. Herein, the fabrication of periodic microstructures on stainless steel using a galvanometer‐scanner DLIP approach is addressed. Line‐like patterns with spatial periods ranging from 2.9 to 12.8 μm are produced using a nanosecond pulsed laser source operating at a wavelength of 527 nm. The scan fields generated are evaluated with respect to the structure quality and scan field size, with dependence on the spatial period. Furthermore, the correlation between the spatial period, laser fluence, total number of pulses, and resulting structure depth of the line‐like patterns is discussed. In addition, the optimization of process parameters leads to surface patterns with aspect ratios greater than 1. The achievable structuring speeds are determined under consideration of the used number of pulses. Finally, throughputs up to 7.69 cm2 min−1 with less than 0.5 W laser power at a repetition rate of 3.5 kHz are realized.

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Section: Resultsmentioning

confidence: 99%

Scanner‐Based Direct Laser Interference Patterning on Stainless Steel

et al. 2021

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“…For overlaps ranging from 40% to 85% as well as hatches between 40% and 85%, the lowest Z sm /Z fm ratios were obtained (down to~0.3). For overlaps and hatches above 85% the structure becomes inhomogeneous due to the high applied energy leading to a significant deterioration of the pattern uniformity as discussed elsewhere [46].…”

Section: Of 16mentioning

confidence: 91%

Development of a Monitoring Strategy for Laser-Textured Metallic Surfaces Using a Diffractive Approach

et al. 2019

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The current status of research around the world concurs on the powerful influence of micro- and nano-textured surfaces in terms of surface functionalization. In order to characterize the manufactured topographical morphology with regard to the surface quality or homogeneity, major efforts are still required. In this work, an optical approach for the indirect evaluation of the quality and morphology of surface structures manufactured with Direct Laser Interference Patterning (DLIP) is presented. For testing the designed optical configuration, line-like surface patterns are fabricated at a 1064 nm wavelength on stainless steel with a repetitive distance of 4.9 µm, utilizing a two-beam DLIP configuration. Depending on the pulse to pulse overlap and hatch distance, different single and complex pattern geometries are produced, presenting non-homogenous and homogenous surface patterns. The developed optical system permitted the successfully classification of different pattern geometries, in particular, those showing single-scale morphology (high homogeneity). Additionally, the fabricated structures were measured using confocal microscopy method, and the obtained topographies were correlated with the recorded optical images.

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“…Thus, the higher thermal conductivity of Scalmalloy ® leads to a larger volume of material that is molten at the interference maxima positions which contributes to the formation of the periodic structure. Furthermore, in case of DLIP treatment with ns pulses, the contribution of the molten material on the structure formation has already been discussed, driven mainly by Marangoni flow and recoil pressure for low and high intensity levels, respectively [ 47 , 48 ].…”

Section: Surface Modification By Dlip Techniquementioning

confidence: 99%

Simultaneous Micro-Structuring and Surface Smoothing of Additive Manufactured Parts Using DLIP Technique and Its Influence on the Wetting Behaviour

et al. 2021

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It is well known that the surface topography of a part can affect its function as well as its mechanical performance. In this context, we report on the surface modification of additive manufactured components made of Titanium 64 and Scalmalloy®, using Direct Laser Interference Patterning technique. In our experiments, a nanosecond-pulsed near-infrared laser source with a pulse duration of 10 ns was used. By varying the process parameters, periodic structures with different depths and associated roughness values are produced. Additionally, the influence of the resultant morphological characteristics on the wettability behaviour of the fabricated textures is investigated by means of contact angle measurements. The results demonstrated a reduction of the surface roughness of the additive manufactured parts (in the order of some tens of micrometres) and simultaneously the production of well-defined micro-patterns (in the micrometre range), which allow the wettability of the surfaces from 26° and 16° up to 93° and 131° to be tuned for Titanium 6Al 4V and Al-Mg-Sc (Scalmalloy®), respectively.

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High Throughput Direct Laser Interference Patterning of Aluminum for Fabrication of Super Hydrophobic Surfaces

Cited by 15 publications

References 56 publications

Scanner‐Based Direct Laser Interference Patterning on Stainless Steel

Scanner‐Based Direct Laser Interference Patterning on Stainless Steel

Development of a Monitoring Strategy for Laser-Textured Metallic Surfaces Using a Diffractive Approach

Simultaneous Micro-Structuring and Surface Smoothing of Additive Manufactured Parts Using DLIP Technique and Its Influence on the Wetting Behaviour

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