Characteristics of in-situ synthesized Hydroxyapatite on TiO2 ceramic via plasma electrolytic oxidation

Ahounbar, Elham; Khoei, Seyed Mohammad Mousavi; Omidvar, Hamid

doi:10.1016/j.ceramint.2018.10.206

Cited by 31 publications

(6 citation statements)

References 40 publications

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“…In the second stage of the processing, the transformation of the oxide layer occurs resulting in the formation of low conductive coating (Figure 1a, area II), and finally stabilizes (Figure 1a, area III). The same behavior was also observed by Ahounbar et al [25].…”

Section: Resultssupporting

confidence: 89%

Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

2019

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The micro arc oxidation (MAO) process has been applied to produce ceramic oxide coating on Ti-6Al-4V alloy. The MAO process was carried out at the symmetric bipolar square pulse in electrolyte containing Na2CO3 and Na2SiO3. The effect of current frequency on the surface morphology, the chemical and the phase compositions as well as the corrosion resistance was examined. Morphology and cross-sectional investigation by electron microscopy evaluated more compacted and less porous coating produced by high current frequency (1000 Hz). This alloy also exhibited a high corrosion resistance in comparison with the untreated alloy. Additionally, the alloy subjected to MAO treatment by a current frequency of 1000 Hz showed a higher corrosion resistance in comparison with alloys obtained by lower current frequencies. This behavior was attributed to more compacted and less porous morphology of the coating.

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Section: Resultssupporting

confidence: 89%

Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

2019

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“…In stage II, the created oxide coating continued to grow, although its amorphous structure transformed into a crystalline form. Moreover, at this stage, the appearance of sparks on the surface was detected as a small peak on the curve (point Vs in Figure ), referred to as sparking potential . In stage III, small and scattered sparks were stabilized by homogeneous distribution on the alloy’s surface.…”

Section: Resultsmentioning

confidence: 90%

“…Moreover, at this stage, the appearance of sparks on the surface was detected as a small peak on the curve (point Vs in Figure 1), referred to as sparking potential. 30 In stage III, small and scattered sparks were stabilized by homogeneous distribution on the alloy's surface. The current drop is attributed to the formation of a thick oxide layer jointly with a change in dielectric properties that appeared in stage IV.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Bioactive Coating on Ti Alloy with High Osseointegration and Antibacterial Ag Nanoparticles

Sobolev

Valkov

Kossenko

et al. 2019

ACS Appl. Mater. Interfaces

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Titanium alloys have advanced mechanical properties jointly with high biocompatibility that make them eminently suitable for biomedical applications such as dental and orthopedic implants. Improvement in their osseointegration with human bone can be achieved by the development of hydroxyapatite (HAp) on a Ti alloy surface using different methods of deposition. However, plasma electrolytic oxidation (PEO) treatment has been found to be one of the most promising techniques, due to the formation of high bonding between the bone and the Ti surface. Along with this high bonding, an antibacterial ability of the surface to prevent bacterial infection is also essential. Silver, which is a widely applicable antibacterial agent, was used in this work. First, a titanium oxide coating containing calcium and phosphorus and Ag nanoparticles was formed by PEO treatment. Then, Ti alloy was subjected to hydrothermal treatment to ensure a crystalline formation of HAp. Morphology and phase composition investigations detected the presence of HAp crystals in the coating along with antibacterial agents of silver nanoparticles. The biocompatibility and bioactivity of the created coating were examined by contact angle (CS) measurement and electrochemical impedance spectroscopy (EIS). It was shown that the coating was extensively grown after exposure of the alloy to simulated body fluid (SBF) solution for 7 days with no effect on the Ag nanoparticles. An antibacterial test using Staphylococcus aureus and Escherichia coli revealed that the coating containing Ag nanoparticles has more significant antibacterial effectiveness compared to a coating that does not contain silver.

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“…In this regard, considerable attention is currently being paid to methods for forming coatings containing calcium phosphate compounds [12,[23][24][25]. Among these methods, plasma electrolytic oxidation (PEO) can be distinguished, which allows one, due to varying the electrolyte composition and formation modes, to significantly change the composition and structure of the synthesized surface layer [26][27][28][29][30][31][32][33][34][35][36][37][38][39]. Thus, Ahounbar et al formed biocompatible coatings on titanium scaffolds using calcium acetate and trisodium phosphate electrolytes [37].…”

Section: Introductionmentioning

confidence: 99%

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

et al. 2020

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Bioactive coatings on VT1-0 commercially pure titanium were formed by the plasma electrolytic oxidation (PEO). A study of the morphological features of coatings was carried out using scanning electron microscopy. A composition of formed coatings was investigated using energy-dispersive spectroscopy and X-ray diffractometry analysis. It was shown that PEO-coatings have calcium phosphate in their composition, which increases the bioactivity of the surface layer. Electrochemical properties of the samples were studied by potentiondynamic polarization and electrochemical impedance spectroscopy in different physiological media: simulated body fluid and minimum essential medium. The data of electrochemical studies indicate more than 15 times decrease in the corrosion current density for the sample with coating (5.0 × 10−9 A/cm2) as compared to the bare titanium (7.7 × 10−8 A/cm2). The formed PEO-layers have elastoplastic properties close to human bone (12–30 GPa) and a lower friction coefficient in comparison with bare metal. The wettability of PEO-layers increased. The contact angle for formed coatings reduced by more than 60° in comparison with bare metal (from 73° for titanium to 8° for PEO-coating). Such an increase in surface hydrophilicity contributes to the greater biocompatibility of the formed coating in comparison with commercially pure titanium. PEO can be prospective as a method for improving titanium surface bioactivity.

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Characteristics of in-situ synthesized Hydroxyapatite on TiO2 ceramic via plasma electrolytic oxidation

Cited by 31 publications

References 40 publications

Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

Study of the Effect of Current Pulse Frequency on Ti-6Al-4V Alloy Coating Formation by Micro Arc Oxidation

Bioactive Coating on Ti Alloy with High Osseointegration and Antibacterial Ag Nanoparticles

Bioactive Coatings Formed on Titanium by Plasma Electrolytic Oxidation: Composition and Properties

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