The effects of femtosecond laser-textured Ti-6Al-4V on wettability and cell response

Raimbault, Ophélie; Benayoun, Stéphane; Anselme, Karine; Mauclair, Cyril; Bourgade, Tatiana; Kietzig, Anne‐Marie; Girard‐Lauriault, Pierre‐Luc; Valette, S.; Donnet, Christophe

doi:10.1016/j.msec.2016.06.072

Cited by 137 publications

(100 citation statements)

References 32 publications

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“…Cell number and cell mean area of HUVECs adhered onto CoCr surfaces were statistically equal for all studied series including CTR. Thus, DLIP technique did not affect cell adhesion, confirming the published results of Raimbault et al on laser‐modified surfaces. The fact that DLIP technique did not modify the nanoroughness of the surface and, consequently, did not affect protein adsorption could explain the similar adhesion and spreading of HUVEC on the patterned surfaces compared to the plain ones.…”

Section: Discussionsupporting

confidence: 88%

“…This effect was visually confirmed through the optical microscopy images, which showed that peaks blocked the water expansion after deposition, mainly when the contact angle was perpendicular to the patterned lines, resulting in oval drop geometry (Figure S2, Supporting Information). This anisotropic wettability on laser‐modified samples was already reported by other authors with Cu and Ti substrates, suggesting that DLIP topographical patterns induced, in general, an anisotropic wettability on metals which could influence protein adsorption and, indeed, cell spreading.…”

Section: Discussionsupporting

confidence: 79%

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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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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 79%

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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“…Whereas the apparent contact angle initially reveals a pronounced drop as compared to unstructured brass, it increases into the hydrophobic regime and saturates over several days. This temporal evolution has already been shown for several metallic surfaces after femtosecond-based laser structuring [17,[25][26][27][28] and is mainly described by a highly chemical reactive surface direct after laser treatment and a growing passive hydrophobic layer rich on carbon from the composition of CO 2 [29]. Both the initial drop and the subsequent increase reveal a strong dependence on pulse overlap and laser fluence.…”

Section: Introductionsupporting

confidence: 54%

Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

et al. 2018

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We present a comprehensive experimental study on laser-induced hierarchic nano-micro periodic surface structures on brass that influences wetting behavior. Using ultra short laser pulses with a wavelength of 1030 nm, large scaled areas completely covered by laser-induced periodic surface structures (LIPSS) are generated with these areas being superimposed by ablation trenches and u-ripples. The influence of the incident laser fluence and pulse overlap on the apparent contact angle for coverage of the surface with distilled water with a surface tension of 74 mN/m are examined with its temporal evolution being observed over a period of two weeks. Our results show an initial drop in the apparent contact angle below the angle of an unstructured surface. Using atomic force microscopy, the roughness factor described by the Wenzel model is determined and compared to the roughness factor given by the apparent contact angle measurement. The ascertained difference in roughness cannot be entirely attributed to the topography of the laser-structured surface. We suggest that changes in the surface chemistry additionally alter the wetting behavior as confirmed by X-ray photoelectron spectroscopy (XPS) measurements. On a time scale of days after laser irradiation, the apparent contact angle increases into the hydrophobic range. Both the absolute apparent contact angle and this temporal change reveal a pronounced dependence on the applied laser fluence and pulse overlap. In particular, increasing both, the fluence and the pulse overlap leads to smaller apparent contact angles directly after the irradiation and to higher apparent contact angles after an observation period of two weeks.

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“…This indicates that the measured contact angles on the CrCoMo samples due to laser processing can be explained by the increase of the ratio between the real surface area and the projected area σ and a reduction of the wetted area due to LIPSS [40,41]. Nonetheless, the contact angles are highly dependent on the formation of additional oxide layers.…”

Section: Wetting Propertiesmentioning

confidence: 92%

Fabricating Laser-Induced Periodic Surface Structures on Medical Grade Cobalt–Chrome–Molybdenum: Tribological, Wetting and Leaching Properties

et al. 2019

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Hip-implants structured with anti-bacterial textures should show a low-friction coefficient and should not leach hazardous substances into the human body. The surface of a typical material used for hip-implants, namely Cobalt–Chrome–Molybdenum (CoCrMo) was textured with different types of laser-induced periodic surface structures (LIPSS)—i.e., low spatial frequency LIPSS (LSFL), hierarchical structures consisting of grooves superimposed with high spatial frequency LIPSS (HSFL) and Triangular shaped Nanopillars (TNP)—using a picosecond pulsed laser source. The effect of LIPSS on the wettability, friction, as well as wear of the structures, when slid against a polyethylene (PE) counter surface and biocompatibility was analyzed. Surfaces covered with LSFL show superhydrophobicity and grooves with superimposed HSFL, as well as TNP, show hydrophobic behavior. The coefficient of friction (CoF) of LIPSS against a polyethylene (PE) counter surface was found to be higher (ranging from 0.40 to 0.66) than the CoF of (polished) CoCrMo, which was found to equal 0.22. It was found that the samples release cobalt within biocompatible limits. Compared to polished reference surfaces, LIPSS cause higher friction of CoCrMo against PE contact. However, the wear of the PE counter surface only increased significantly for the LSFL textures. For these reasons, it is concluded that LIPSS are not suitable for a heavily loaded metal-on-plastic bearing contact.

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The effects of femtosecond laser-textured Ti-6Al-4V on wettability and cell response

Cited by 137 publications

References 32 publications

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

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

Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

Fabricating Laser-Induced Periodic Surface Structures on Medical Grade Cobalt–Chrome–Molybdenum: Tribological, Wetting and Leaching Properties

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