Anodic thin films on titanium used as masks for surface micropatterning of biomedical devices

Jaeggi, Christian; Kern, P.; Michler, Johann; Zehnder, Thomas; Siegenthaler, H.

doi:10.1016/j.surfcoat.2005.08.021

Cited by 31 publications

(28 citation statements)

References 22 publications

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“…5. The general behavior is similar in both electrolytes up to ¾80 V. However, the two time constants are more clearly separated in phosphoric acid oxides, starting from 20 V.…”

Section: Ac Impedancementioning

confidence: 76%

“…5. For a given potential, phosphoric acid oxides were generally slightly thinner than oxides grown in sulfuric acid.…”

Section: Anodization and Oxide Thicknessmentioning

confidence: 94%

“…Their preparation and the anodic oxidation setup has been described elsewhere. 5 The electrolytes were prepared from 95-97% H 2 SO 4 and 85% H 3 PO 4 (p.a. Merck), respectively.…”

Section: Methodsmentioning

confidence: 99%

“…On the basis of TEM imaging and impedance data, a serial (two) layer model 5 consisting of two parallel (R-CPE) elements combined in series was chosen for data fitting, clearly simplifying the highly complex nature of these oxides. In the equivalent circuit R E -CPE P -R P -CPE D -R D used, R E , R P and R D are the resistances of the electrolyte (E), the porous part (P) and the dense part (D) of the oxide, respectively.…”

Section: Ac Impedancementioning

confidence: 99%

“…5 In this work, surfaces anodized in sulfuric and phosphoric acid containing electrolytes, both often used in anodic oxidation of Ti-like materials, were compared with respect to film growth and chemical composition (electrolyte impurities) of the resulting thin oxides.…”

Section: Introductionmentioning

confidence: 99%

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Film formation and characterization of anodic oxides on titanium for biomedical applications

Jaeggi

Kern

Michler

et al. 2006

Surface & Interface Analysis

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For a better understanding of the oxide growth and final film properties upon anodization of titanium in sulfuric and phosphoric acid containing electrolytes, the electrochemical behavior as studied by a.c. impedance was correlated to microstructural analysis (TEM, Raman). Chemical depth profiling of the films was performed with glow discharge optical emission spectroscopy (GDOES), XPS and RBS. The fitted capacitances and resistances from a.c. impedance measurements were greatly influenced by the ongoing crystallization as well as by film porosity as a function of increasing anodization potential. GDOES revealed a small sulfur contamination (with its maximum before the oxide-metal interface) upon anodization in 1 M H 2 SO 4 and a significant phosphorus content throughout the oxides for films grown in 1 M H 3 PO 4 , showing an accumulation at the surface. Small impurities of carbon in all films as well as an accumulation of hydrogen at/after the interface oxide-metal were also observed. Quantification of the hydrogen content by elastic recoil detection analysis (ERDA) indicated a peak concentration of 20-30 at%.

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“…5. The general behavior is similar in both electrolytes up to ¾80 V. However, the two time constants are more clearly separated in phosphoric acid oxides, starting from 20 V.…”

Section: Ac Impedancementioning

confidence: 76%

“…5. For a given potential, phosphoric acid oxides were generally slightly thinner than oxides grown in sulfuric acid.…”

Section: Anodization and Oxide Thicknessmentioning

confidence: 94%

“…Their preparation and the anodic oxidation setup has been described elsewhere. 5 The electrolytes were prepared from 95-97% H 2 SO 4 and 85% H 3 PO 4 (p.a. Merck), respectively.…”

Section: Methodsmentioning

confidence: 99%

Section: Ac Impedancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Film formation and characterization of anodic oxides on titanium for biomedical applications

Jaeggi

Kern

Michler

et al. 2006

Surface & Interface Analysis

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Corrosion resistance of titanium dioxide anodic coatings on Ti–6Al–4V

Vera

Linardi

Lanzani

et al. 2014

Materials & Corrosion

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The Ti–6Al–4V alloy is used for biomedical implants due to its corrosion resistance and biocompatibility, associated with the spontaneous formation of TiO2 oxide. However, the native film may be flawed and after some time of implantation in the body it may release metal ions. Oxides of higher thickness than naturally grown can be produced by anodic oxidation. The objective of this study was to evaluate the corrosion resistance of anodic TiO2 coatings, evaluating the influence of the thickness and crystalline structure of the coatings. Amorphous coatings were obtained from 27 to 140 nm that crystallized in anatase and rutile phases by heat treatment. The corrosion resistance was evaluated by potentiodynamic measurements in 0.9% sodium chloride, which is the main component of physiological solution. Evaluation of the electrochemical parameters showed that anodic coatings are more efficient barrier than the natural TiO2 oxide. As the oxidation processes influenced the electrochemical properties of metals by altering the resistance to corrosion, therefore they become important to study the electrochemical behavior of the oxides by electrochemical impedance spectroscopy.

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Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Sanchez

Schreiner

Duffó

et al. 2013

Surface & Interface Analysis

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Titanium surface characteristics determine the degree of success of permanent implants. The topography, morphology of the surface in micro and nano scales, the impurities present and other characteristics are a main concern, and therefore a multi‐technique approach is required in order to evaluate modification process effects on the surface. Surface modification of titanium in the nanometrical range was performed by means of anodisation in phosphoric with the aim of improving both the biocompatibility and the corrosion resistance in the biological media. Biocompatible characteristics of the modified titanium surface, as the presence of anatase in the oxide film and the incorporation of phosphate to the surface, were determined. Moreover, the electronic properties of the surface oxide presented a carrier number adequate for biomedical applications. The increase in the film thickness from 3 to 42 nm was estimated from EIS results when anodising potentials from 0 to 30 V were applied, whereas a bi‐layer structure of the protective oxides formed was determined. Copyright © 2013 John Wiley & Sons, Ltd.

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Anodic thin films on titanium used as masks for surface micropatterning of biomedical devices

Cited by 31 publications

References 22 publications

Film formation and characterization of anodic oxides on titanium for biomedical applications

Film formation and characterization of anodic oxides on titanium for biomedical applications

Corrosion resistance of titanium dioxide anodic coatings on Ti–6Al–4V

Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

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