Characteristics of hemocompatible TiO2 nano-films produced by the sol-gel and anodic oxidation techniques

Abstract:To obtain smooth TiO 2 coatings for building a new design of Ti-6Al-4V heart valve, the anodic oxidation technique in pre-spark conditions was evaluated. TiO 2 coating is necessary for its recognized biocompatibility and corrosion resistance. A required feature on surfaces in contact with blood is a low level of roughness (R a ≤ 50 nm) that does not favor the formation of blood clots. The present paper compares the coatings obtained by anodic oxidation of the Ti-6Al-4V alloy using H 2 SO 4 at different concentrations (0.1-4 M) as electrolyte and applying different voltages (from 20 to 70 V). Color and morphological analysis of coatings are performed using optical and scanning microscopy. The crystalline phases were analyzed by glancing X-ray diffraction. By varying the applied voltage, different interference colors coatings were obtained. The differences in morphologies of the coatings caused by changes in acid concentration are more evident at high voltages, limiting the oxidation conditions for the desired application. Anatase phase was detected from 70 V for 1 M H 2 SO 4 . An increase in the concentration of H 2 SO 4 decreases the voltage at which the transformation of amorphous to crystalline coatings occurs; i.e., with 4 M H 2 SO 4 , the anatase phase appears at 60 V.

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“…TiO 2 coatings have demonstrated hemocompatibility properties appropriate for use in this type of prosthesis [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Electrolyte Concentration on the Smooth TiO2 Anodic Coatings on Ti-6Al-4V

et al. 2017

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“…Yet, in wastewaters treatment the use of non-immobilized particles or poorly adherent films implies an onerous process of separation of catalyst from purified water. Creating TiO 2 films directly by oxidizing metallic titanium would provide a much stronger adhesion of the oxide to the substrate, and therefore improved stability to water flowing in photocatalytic devices and longer lifetime, while still being easy to control and implement even on an industrial scale [15,16].…”

Section: Introductionmentioning

confidence: 99%

Anodic titanium oxide as immobilized photocatalyst in UV or visible light devices

Diamanti

Ormellese

Marin

et al. 2011

Journal of Hazardous Materials

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“…TiO2 coatings have demonstrated hemocompatibility properties appropriate for use in this type of prosthesis [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Electrolyte Concentration on the Smooth TiO2 Anodic Coatings on Ti-6Al-4V

Vera¹,

Colaccio²,

Rosenberger³

et al. 2017

Preprint

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To obtain smooth TiO2 coatings for building a new design of Ti-6Al-4V heart valve, the anodic oxidation technique in pre-spark conditions was evaluated. TiO2 coating is necessary for its recognized biocompatibility and corrosion resistance. A required feature on surfaces in contact with blood is a low level of roughness (Ra ≤ 50 nm) that does not favor the formation of blood clots. The present paper compares the coatings obtained by anodic oxidation of the Ti-6Al-4V alloy using H2SO4 at different concentrations (0.1-4 M) as electrolyte and applying different voltages (from 20 to 70 V). Color and morphological analysis of coatings are performed using optical and scanning microscopy. The crystalline phases were analyzed by glancing X-ray diffraction. By varying the applied voltage, different interference colors coatings were obtained. The differences in morphologies of the coatings caused by changes in concentration are more evident at high voltages, limiting the oxidation conditions for the desired application. Anatase phase was detected from 70 V for 1 M H2SO4. An increase in the concentration of H2SO4 decreases the voltage at which the transformation of amorphous to crystalline coatings occurs; i.e., with 4 M H2SO4, the anatase phase appears at 60 V.

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Characteristics of hemocompatible TiO2 nano-films produced by the sol-gel and anodic oxidation techniques

Cited by 19 publications

References 27 publications

Influence of the Electrolyte Concentration on the Smooth TiO2 Anodic Coatings on Ti-6Al-4V

Influence of the Electrolyte Concentration on the Smooth TiO2 Anodic Coatings on Ti-6Al-4V

Anodic titanium oxide as immobilized photocatalyst in UV or visible light devices

Influence of the Electrolyte Concentration on the Smooth TiO2 Anodic Coatings on Ti-6Al-4V

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