Surface characteristics and cell-adhesion performance of titanium treated with direct-current gas plasma comprising nitrogen and oxygen

Hirano, Mitsuhiro; Yamane, Masayuki; Ohtsu, Naofumi

doi:10.1016/j.apsusc.2015.02.153

Cited by 15 publications

(16 citation statements)

References 16 publications

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“…In this context it is necessary to develop new materials or to improve the existent ones by functional coatings. Titanium based stents exhibit reasonable surface properties and, if coated with a titanium oxynitride layer their performances for both medical [1][2][3] and engineering applications [4][5][6] can be further improved. Based on numerous works, stents coated with a TiOxNy film, exhibit superior clinical performance compared with uncoated stents especially due to the low adherence of platelets and fibrinogen [7,8].…”

Section: Extended Abstractmentioning

confidence: 99%

Thickness, Temperature and Magnetic Field Dependent Resistance of Cu1.8S

Jo¹,

Woo²,

Kim³

et al. 2018

Proceedings of the 3rd World Congress on Recent Advances in Nanotechnology

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Section: Extended Abstractmentioning

confidence: 99%

Thickness, Temperature and Magnetic Field Dependent Resistance of Cu1.8S

Jo¹,

Woo²,

Kim³

et al. 2018

Proceedings of the 3rd World Congress on Recent Advances in Nanotechnology

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“…Surface nitriding of titanium (Ti) using laser irradiation has been studied with the aim of enhancing the hardness of the Ti surface. Compared with other nitriding techniques using gas plasma and thermal diffusion, the laser process has the advantages of reduced equipment size and precise selection of the treated area. Accordingly, the laser‐nitriding process has gained considerable attention as a new industrial process for improving the wear resistance of metallic materials .…”

Section: Introductionmentioning

confidence: 99%

“…The higher pulse frequency and the faster flow rate were beneficial for obtaining a higher-quality layer because of the enhancement of nitridation and the suppression of oxidation, respectively. Compared with other nitriding techniques using gas plasma 1-3 and thermal diffusion, [4][5][6][7] the laser process has the advantages of reduced equipment size and precise selection of the treated area. Accordingly, the laser-nitriding process has gained considerable attention as a new industrial process for improving the wear resistance of metallic materials.…”

mentioning

confidence: 99%

Parameter settings in a compact laser‐nitriding system for titanium composed of a focused pulsed Nd:YAG laser and nitrogen gas blow

Ohtsu

Saito

Yamane

2018

Surface & Interface Analysis

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The aim of the present study was to form a nitride layer on a titanium (Ti) substrate through a compact laser‐nitriding system comprising a focused pulsed Nd:YAG laser and nitrogen gas blow. To obtain a high‐quality layer, the effects of pulse frequency and gas flow rate on the surface characteristics were investigated by using plasma emission analysis as well as X‐ray analyses. Optical emission spectra from the laser‐induced plasma mainly consisted of ionic Ti lines, and their intensities when the pulse frequency was 15 Hz were much higher than those for 8 Hz. Similarly, the reflections from the δ‐TiN phase in the X‐ray diffraction (XRD) pattern were enhanced when using 15 Hz. On the other hand, the flow rate of nitrogen gas blow had a significant effect on the thickness of the thin oxide layer that formed above the nitride layer. Using a lower flow rate resulted in the formation of a thicker oxide layer. The higher pulse frequency and the faster flow rate were beneficial for obtaining a higher‐quality layer because of the enhancement of nitridation and the suppression of oxidation, respectively.

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Section: Extended Abstractmentioning

confidence: 99%

Design of TiOxNy for Developing Layered Stent Technology

Ficai¹,

Sönmez²,

Trusc³

et al. 2017

Proceedings of the 2nd World Congress on Recent Advances in Nanotechnology

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Extended AbstractStents are medical devices that are increasingly used in medical practice. Unfortunately, existing materials present certain disadvantages and lead to high failure risk. In this context it is necessary to develop new materials or to improve the existent ones by functional coatings. Titanium based stents exhibit reasonable surface properties and, if coated with a titanium oxynitride layer their performances for both medical [1][2][3] and engineering applications [4][5][6] can be further improved. Based on numerous works, stents coated with a TiOxNy film, exhibit superior clinical performance compared with uncoated stents especially due to the low adherence of platelets and fibrinogen [7,8]. In this study, the synthesis of TiO2 nanopowders was carried out by three different routes, in order to optimize the N:O ratio, in particularly, and thus to design the characteristics of the obtained nanopowders. The first synthesis route involved the chemical modification of the titanium dioxide (anatase form), by exposure at the action of ammonia 25% under magnetic stirring for 12h, followed by drying at 80°C overnight. TiOxNy nanoparticles were obtained with average particle size of 20-30nm, but also particles as large as 100nm in diameter can be identified. The second synthesis route involved in hydrolysis of titanium isopropoxide in concentrated ammonia. Hydrolysis was carried out by maintaining titanium isopropoxide in NH4OH (25%) for 12h, under magnetic stirring, followed by drying at 80°C overnight. It should be noted that the hydrolysis is practically instantaneous. TiOxNy nanoparticles were obtained with a broader particle size distribution with particles starting from 5-10nm to particles larger than 100nm in diameter. The third synthetic route involve the hydrolysis of titanium isopropoxide with the ammonia vapour followed by drying at 80oC, overnight. It should be noted that the modification of the morphology of the particles are independent and as a result of the treatment that has been exposed to moist powder is practically negligible. TiOxNy nanoparticles were obtained with particle sizes of 5-10nm, the tendency of agglomeration being very high. The N:O ratio was in the range 1:20 to 1:10 being adequate for manufacturing coated stents.

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Surface characteristics and cell-adhesion performance of titanium treated with direct-current gas plasma comprising nitrogen and oxygen

Cited by 15 publications

References 16 publications

Thickness, Temperature and Magnetic Field Dependent Resistance of Cu1.8S

Thickness, Temperature and Magnetic Field Dependent Resistance of Cu1.8S

Parameter settings in a compact laser‐nitriding system for titanium composed of a focused pulsed Nd:YAG laser and nitrogen gas blow

Design of TiOxNy for Developing Layered Stent Technology

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