Fabrication of four-level hierarchical topographies through the combination of LIPSS and direct laser interference pattering on near-beta titanium alloy

Schell, Frederic; Alamri, Sabri; Hariharan, Avinash; Gebert, A.; Lasagni, Andrés Fabían; Kunze, Tim

doi:10.1016/j.matlet.2021.130920

Cited by 18 publications

(15 citation statements)

References 9 publications

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“…The periodicity of ca. 400 nm is consistent with expected values for green light on titanium [35,36] …”

Section: Resultssupporting

confidence: 88%

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Fox,

Maria Delfino,

Cortés

et al. 2023

ChemNanoMat

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State of the art approaches to produce photocatalytic surfaces generally require multiple processing steps to achieve highly active surfaces. Following recent trends to facilitate the production of active surfaces, this work presents a single‐step method to create porous photocatalytic surfaces via direct laser interference patterning (DLIP) of a titanium substrate with pulses in the picosecond range. The resulting surfaces contain a variety of titanium oxides while both their composition and morphology can be controlled through the laser process parameters. This makes it possible to tailor these surfaces for specific applications such as antimicrobial surfaces, implant materials or water treatment. Surface characterization was executed by applying scanning electron microscopy complemented by focused ion beam cross‐sectioning and energy dispersive X‐ray spectroscopy as well as gracing incidence X‐ray diffractometry. The photocatalytic activity achieved by different laser parameters is assessed by methylene blue degradation under UV‐A light. As DLIP is already established in industrial applications, this approach could greatly facilitate the use of photocatalytic surfaces for water treatment or medical applications, as it does not require nanoparticle synthesis or additional coating steps.

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“…The periodicity of ca. 400 nm is consistent with expected values for green light on titanium [35,36] …”

Section: Resultssupporting

confidence: 88%

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Fox,

Maria Delfino,

Cortés

et al. 2023

ChemNanoMat

View full text Add to dashboard Cite

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“…In the high-frequency range (large wavenumbers) of the ordinate also a new feature appears. The signal originated from parallel ripples on the slopes of the trenches, which most likely results from the interference of incident and the forward-reflected light at the slopes 9 , 14 . In the following, these ripples were denoted by LSFL and their signal by type-s .…”

Section: Resultsmentioning

confidence: 99%

“…Although this in turn cannot be achieved without a large increase in heat accumulation. Therefore, process strategies providing hierarchical topographies are probably not transferable to higher repetition rates without changes in process dynamics and structure formation 9 , 12 . In this frame, it is of great relevance to investigate how the substrate temperature affects the DLIP formation process, especially when fabricating hierarchical surface patterns due to the simultaneous formation of LIPSS.…”

Section: Introductionmentioning

confidence: 99%

Heating influence on hierarchical structures fabricated by direct laser interference patterning

Schröder

Nyenhuis

Baumann

et al. 2022

Sci Rep

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The combination of direct laser interference patterning (DLIP) with laser-induced periodic surface structures (LIPSS) enables the fabrication of functional surfaces reported for a wide spectrum of materials. The process throughput is usually increased by applying higher average laser powers. However, this causes heat accumulation impacting the roughness and shape of produced surface patterns. Consequently, the effect of substrate temperature on the topography of fabricated features requires detailed investigations. In this study, steel surfaces were structured with line-like patterns by ps-DLIP at 532 nm. To investigate the influence of substrate temperature on the resulting topography, a heating plate was used to adjust the temperature. Heating to 250 $$^{\circ }$$ ∘ C led to a significant reduction of the produced structure depths, from 2.33 to 1.06 µm. The reduction is associated with the appearance of a different LIPSS type, depending on the grain orientation of the substrates and laser-induced superficial oxidation. This study revealed a strong effect of substrate temperature, which is also to be expected when heat accumulation effects arise from processing surfaces at high average laser power.

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“…As a result, inhomogeneous energy deposition leads to self-arrangement of the material and formation of ripples in the submicrometic range, either Low Spatial Frequency LIPSS (LSFL) perpendicular to the beam polarisation with structure periods larger than λ/2, or High Spatial Frequency LIPPS (HSFL) with structure periods much smaller than λ/2. Recent studies have also shown the possibility to combine LIPPS in top of DLIP structures achieving multiscale strucures [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of periodic surface structures created by direct laser interference patterning

et al. 2023

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Surface structuring using nano-second lasers can be used to enhance certain properties of a material or even to introduce new ones. One way to create these structures efficiently is direct laser interference patterning using different polarization vector orientations of the interfering beams. However, experimentally measuring the fabrication process of these structures is very challenging due to small length and time scales. Therefore, a numerical model is developed and presented for resolving the physical effects during formation the predicting the resolidified surface structures. This three-dimensional, compressible computational fluid dynamics model considers the gas, liquid, and solid material phase and includes various physical effects, such as heating due to the laser beam for both parallel and radial polarization vector orientations, melting, solidification, and evaporation, Marangoni convection, and volumetric expansion. The numerical results reveal a very good qualitatively and quantitatively agreement with experimental reference data. Resolidified surface structures match both in overall shape as well as crater diameter and height, respectively. Furthermore, this model gives valuable insight on different quantities during the formation of these surface structures, such as velocity and temperature. In future, this model can be used to predict surface structures based on various process input parameters.

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Fabrication of four-level hierarchical topographies through the combination of LIPSS and direct laser interference pattering on near-beta titanium alloy

Cited by 18 publications

References 9 publications

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Single‐step Production of Photocatalytic Surfaces via Direct Laser Interference Patterning of Titanium

Heating influence on hierarchical structures fabricated by direct laser interference patterning

Numerical simulation of periodic surface structures created by direct laser interference patterning

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