Time-Dependent Anisotropic Wetting Behavior of Deterministic Structures of Different Strut Widths on Ti6Al4V

Schnell, Georg; Jagow, Christopher; Springer, Armin; Frank, Marcus; Seitz, Hermann

doi:10.3390/met9090938

Cited by 11 publications

(8 citation statements)

References 28 publications

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“…For calculation of the SCAs, the software Software SCA 20_U (Version 2, 2010, DataPhysics Instruments GmbH, Filderstadt, Germany) was used. The procedure the SCA measurements is based on previous studies [ 16 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

“…For such applications, the structuring of surfaces with short pulse laser or, in particular, ultra-short pulse lasers is of special importance in research and industrial applications. Due to the ability of creating stochastic (nano- and/or micro) [ 17 , 18 , 19 ] and highly precise deterministic structures [ 20 , 21 ] it is possible to initiate a desired wetting state in a fast processing time without subsequent processing on metals [ 22 ]. Therefore, the static contact angle (SCA) is often used to characterize the wetting state on laser-structured surfaces and related to relevant structuring parameters and biological response [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Chemical Solvents on the Wetting Behavior Over Time of Femtosecond Laser Structured Ti6Al4V Surfaces

et al. 2020

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The effect of chemical solvents on the wetting state of laser-structured surfaces over time is systematically examined in this paper. By using a 300-fs laser, nanostructures were generated on Ti6Al4V, subsequently cleaned in an ultrasonic bath with different solvents and stored in ambient air. The static contact angle showed significant differences for cleaning with various solvents, which, depending on the applied cleaning and time, amounted up to 100°. X-ray photoelectron spectroscopy analyses reveal that the cleaning of the laser-structured surfaces affects the surface chemistry and the aging behavior of the surfaces, even with highly volatile solvents. The effect of the chemical surface modification is particularly noticeable when using alcohols for cleaning, which, due to their OH groups, cause highly hydrophilic behavior of the surface after one day of storage. Over the course of 14 days, enrichment with organic groups from the atmosphere occurs on the surface, which leads to poorer wetting on almost every structured surface. In contrast, the cleaning in hexane leads to a fast saturation of the surface with long-chain carbon groups and thus to a time-independent hydrophobic behavior.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Chemical Solvents on the Wetting Behavior Over Time of Femtosecond Laser Structured Ti6Al4V Surfaces

et al. 2020

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“…Conventional techniques such as sandblasting [ 14 , 15 , 16 , 17 , 18 ], chemical etching [ 16 , 17 , 18 ], and coatings [ 17 ] were applied. In addition, laser treatment is a more recent technology with several advantages including a reduced risk for surface contamination [ 19 ] and the possibility of producing stochastic or precise deterministic structures in micro and nanometer ranges [ 20 ]. Several studies have shown the potential of ultrashort-pulsed lasers on the structuring of titanium for biomedical implants [ 5 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Preclinical In Vitro Assessment of Submicron-Scale Laser Surface Texturing on Ti6Al4V

et al. 2020

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Loosening of orthodontic and orthopedic implants is a critical and common clinical problem. To minimize the numbers of revision surgeries due to peri-implant inflammation or insufficient osseointegration, developments of new implant manufacturing strategies are indicated. Ultrafast laser surface texturing is a promising contact-free technology to modify the physicochemical properties of surfaces toward an anti-infectious functionalization. This work aims to texture Ti6Al4V surfaces with ultraviolet (UV) and green (GR) radiation for the manufacturing of laser-induced periodic surface structures (LIPSS). The assessment of these surface modifications addresses key aspects of topography, morphology and chemical composition. Human primary mesenchymal stromal cells (hMSCs) were cultured on laser-textured and polished Ti6Al4V to characterize the surfaces in terms of their in vitro biocompatibility, cytotoxicity, and metal release. The outcomes of the in vitro experiment show the successful culture of hMSCs on textured Ti6Al4V surfaces developed within this work. Cells cultured on LIPSS surfaces were not compromised in terms of their viability if compared to polished surfaces. Yet, the hMSC culture on UV-LIPSS show significantly lower lactate dehydrogenase and titanium release into the supernatant compared to polished. Thus, the presented surface modification can be a promising approach for future applications in orthodontics and orthopedics.

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“…Sandblasting [7][8][9][10][11], chemical etching [9][10][11], and coatings [10] have been used for roughness modification of titanium surfaces for a long time and have been well investigated. Laser treatment of titanium has been found to be particularly advantageous compared to conventional surface structuring methods because it leads to less contamination of the surfaces [12] and offers the possibility of creating stochastic as well as precise deterministic structures in the microand nanometer range [5,13,14]. In particular, the potential of femtosecond (fs) laser structuring of titanium for use in biomedical implants has been shown in several studies [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Pulse Overlap and Scanning Line Overlap on Femtosecond Laser-Structured Ti6Al4V Surfaces

2020

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Surface structuring is a key factor for the tailoring of proper cell attachment and the improvement of the bone-implant interface anchorage. Femtosecond laser machining is especially suited to the structuring of implants due to the possibility of creating surfaces with a wide variety of nano- and microstructures. To achieve a desired surface topography, different laser structuring parameters can be adjusted. The scanning strategy, or rather the laser pulse overlap and scanning line overlap, affect the surface topography in an essential way, which is demonstrated in this study. Ti6Al4V samples were structured using a 300 fs laser source with a wavelength of 1030 nm. Laser pulse overlap and scanning line overlap were varied between 40% and 90% over a wide range of fluences (F from 0.49 to 12.28 J/cm²), respectively. Four different main types of surface structures were obtained depending on the applied laser parameters: femtosecond laser-induced periodic surface structures (FLIPSS), micrometric ripples (MR), micro-craters, and pillared microstructures. It could also be demonstrated that the exceedance of the strong ablation threshold of Ti6Al4V strongly depends on the scanning strategy. The formation of microstructures can be achieved at lower levels of laser pulse overlap compared to the corresponding value of scanning line overlap due to higher heat accumulation in the irradiated area during laser machining.

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Time-Dependent Anisotropic Wetting Behavior of Deterministic Structures of Different Strut Widths on Ti6Al4V

Cited by 11 publications

References 28 publications

Effect of Chemical Solvents on the Wetting Behavior Over Time of Femtosecond Laser Structured Ti6Al4V Surfaces

Effect of Chemical Solvents on the Wetting Behavior Over Time of Femtosecond Laser Structured Ti6Al4V Surfaces

Preclinical In Vitro Assessment of Submicron-Scale Laser Surface Texturing on Ti6Al4V

Effect of Laser Pulse Overlap and Scanning Line Overlap on Femtosecond Laser-Structured Ti6Al4V Surfaces

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