FEM simulation of periodical local heating caused by Laser Interference Metallurgy

Lasagni, Andrés Fabían; Mücklich, Frank

doi:10.1016/j.jmatprotec.2008.01.040

Cited by 27 publications

(13 citation statements)

References 19 publications

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“…One of the most important laser processing parameters that control the morphology of the periodic patterns is laser fluence . This effect can be observed for instance in Figure for a 10 µm spatial period.…”

Section: Resultsmentioning

confidence: 99%

“…A new method that was shown to be capable of producing surface patterns in metals in the micro and sub‐micrometer range is direct laser interference patterning (DLIP) . Compared to a direct laser writing process, DLIP allows higher processing speeds (up to 0.36 m 2 min −1 for metals), as well as resolution even in the sub‐micrometer range .…”

Section: Introductionmentioning

confidence: 99%

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Laser Surface Pattering of Titanium for Improving the Biological Performance of Dental Implants

Zwahr

Günther

Brinkmann

et al. 2016

Adv Healthcare Materials

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Direct laser interference patterning (DLIP) is used to produce periodic line-like patterns on titanium surfaces. An Nd:YAG laser operating at 532 nm wavelength with a pulse duration of 8 ns is used for the laser patterning process. The generated periodic patterns with spatial periods of 5, 10, and 20 µm are produced with energy densities between 0.44 and 2.6 J cm with a single laser pulse. With variation of energy density, different shapes of the arising topography are observed due to the development of the solidification front of the molten material at the maxima positions. Characterization of the surface chemistry shows that the DLIP treatment enhances the content of nitrogen of the titanium reactive layer from 3.9% up to 23.4%. The structural analysis near the titanium surface shows no changes in microstructure after the laser treatment. Contact angles between 65° and 79° are measured on both structured and turned reference surfaces. Cell viability of human osteoblasts on line-like patterned surfaces after 7 d in cultivation medium is 16% higher compared to the grit-blasted and acid-etched references. Finally, the possibility of patterning complex 3D dental implants is shown.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser Surface Pattering of Titanium for Improving the Biological Performance of Dental Implants

Zwahr

Günther

Brinkmann

et al. 2016

Adv Healthcare Materials

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“…DLIP technique applied to metals generates melting of the surface layer at the constructive interference, and the molten metal flows to the destructive interference zone due to the surface tension gradient induced by the difference of temperatures . If the applied fluency is enough, two consecutive constructive interferences can melt enough material to form a single peak between them and, consequently, cover the entire surface with molten and resolidified material.…”

Section: Discussionmentioning

confidence: 99%

Direct Laser Interference Patterning of CoCr Alloy Surfaces to Control Endothelial Cell and Platelet Response for Cardiovascular Applications

Schieber

Lasserre

Hans

et al. 2017

Adv Healthcare Materials

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The main drawbacks of cardiovascular bare-metal stents (BMS) are in-stent restenosis and stent thrombosis as a result of an incomplete endothelialization after stent implantation. Nano- and microscale modification of implant surfaces is a strategy to recover the functionality of the artery by stimulating and guiding molecular and biological processes at the implant/tissue interface. In this study, cobalt-chromium (CoCr) alloy surfaces are modified via direct laser interference patterning (DLIP) in order to create linear patterning onto CoCr surfaces with different periodicities (≈3, 10, 20, and 32 µm) and depths (≈20 and 800 nm). Changes in surface topography, chemistry, and wettability are thoroughly characterized before and after modification. Human umbilical vein endothelial cells' adhesion and spreading are similar for all patterned and plain CoCr surfaces. Moreover, high-depth series induce cell elongation, alignment, and migration along the patterned lines. Platelet adhesion and aggregation decrease in all patterned surfaces compared to CoCr control, which is associated with changes in wettability and oxide layer characteristics. Cellular studies provide evidence of the potential of DLIP topographies to foster endothelialization without enhancement of platelet adhesion, which will be of high importance when designing new BMS in the future.

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“…The temperature distribution in ta-C on steel is calculated the program FlexPDE (for more details see Ref. [18]). The thermal diffusivity is calculated according to Ref [12].…”

Section: Thermal Simulation Of Interference Patterning Of Ta-cmentioning

confidence: 99%

Dependence between friction of laser interference patterned carbon and the thin film morphology

Roch

Benke

Milles

et al. 2015

Diamond and Related Materials

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FEM simulation of periodical local heating caused by Laser Interference Metallurgy

Cited by 27 publications

References 19 publications

Laser Surface Pattering of Titanium for Improving the Biological Performance of Dental Implants

Laser Surface Pattering of Titanium for Improving the Biological Performance of Dental Implants

Direct Laser Interference Patterning of CoCr Alloy Surfaces to Control Endothelial Cell and Platelet Response for Cardiovascular Applications

Dependence between friction of laser interference patterned carbon and the thin film morphology

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