Bioactivity and electrochemical behavior of hydroxyapatite-silicon-multi walled carbon nano-tubes composite coatings synthesized by EPD on NiTi alloys in simulated body fluid

Khalili, Vida; Khalil‐Allafi, Jafar; Frenzel, Jan; Eggeler, Gunther

doi:10.1016/j.msec.2016.10.036

Cited by 44 publications

(16 citation statements)

References 30 publications

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“…This phenomenon makes it difficult to separate the time relaxation of the physical impedance of the coating from that of the electrochemical reaction impedance at the Ti/coating interface. 1,2 The same conclusion can be reached by qualitatively comparing the polarization data with the results pertinent to the Nyquist plots.…”

Section: Corrosion Behaviormentioning

confidence: 55%

“…A higher corrosion potential and lower corrosion current indicate a higher corrosion resistance. 1,6 Moreover, as seen in Figure 6A, the co-incorporation of F and Ag into the HA shifts the E corr and i corr of the coated substrate from −551 mV and 3.71 μA to −524 mV and 0.18 μA, respectively. The uniformly compact surface of the FAgHA/TNT coating can better protect the substrate, which prevents corrosive ions from entering into the substrate.…”

Section: Corrosion Behaviormentioning

confidence: 85%

“…The uniformly compact surface of the FAgHA/TNT coating can better protect the substrate, which prevents corrosive ions from entering into the substrate. 1,2 Electron and ion transports at the coating/electrolyte interface are hindered by the FAgHA coating deposited on the protective TiO 2 nanotubes layer whose regeneration can also be promoted by the coating through its uncompressed structure, which then protects the substrate against corrosion. 4 Very useful information about the resistive and capacitive behavior of all as-coated samples can be obtained by the EIS.…”

Section: Corrosion Behaviormentioning

confidence: 99%

“…Owing to their excellent biological and mechanical properties, commercially pure titanium (CP-Ti) and Ti alloys (Ti6Al4V) have widely been in use as endosseous implants in clinics. 1,2 However, Ti lacks antimicrobial properties and sufficient osteogenic activity, which leads to a delayed osseointegration and complicated bacterial infections -which consequently may make implants fail, particularly in patients with complex pathologies. 3,4 This negative effect of metallic implants has been reduced with the application of coatings of bioactive calcium phosphates (Ca-P) such as hydroxyapatite (HA) with the chemical formula of Ca 10 (PO 4 ) 6 (OH) 2 .…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured Ag+-substituted fluorhydroxyapatite-TiO2 coatings for enhanced bactericidal effects and osteoinductivity of Ti for biomedical applications

Huang

Song

Chang

et al. 2018

IJN

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BackgroundPoor mechanical properties, undesirable fast dissolution rate, and lack of antibacterial activity limit the application of hydroxyapatite (HA) as an implant coating material. To overcome these limitations, a hybrid coating of Ag+-substituted fluorhydroxyapatite and titania nanotube (TNT) was prepared.MethodsThe incorporation of silver into the HA-TiO2 hybrid coating improves its antimicrobial properties. The addition of F as a second binary element increases the structural stability of the coating. The TNT/F-and-Ag-substituted HA (FAgHA) bilayer coating on the Ti substrate was confirmed by X-ray diffraction, scanning electron microscope, energy-dispersive X-ray spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS).ResultsThe results indicate that the FAgHA/TNT nanocomposite coating has a dense and uniform morphology with a nano-rod-like structure. The solubility measurement result shows that the substitution of F− ions into the AgHA structure has a positive effect on the dissolution resistance of HA. The adhesion strength of FAgHA/TNT has significantly increased because of the interlocking of the roughened surface with nano-rod-like particles that entered into the voids of the TiO2 nanotubes. Compared with that of the bare Ti, the corrosion current density of FAgHA/TNT-coated Ti substrate decreased from 3.71 to 0.18 μA, and its corrosion resistance increased by almost two orders of magnitude. Moreover, despite pure HA, the FAgHA killed all viable Staphylococcus aureus after 24 hours of incubation. Although the fabricated FAgHA/TNT coating is hydrophobic, it induced deposition of the typical spherical apatite when immersed in a simulated body fluid (SBF); the osteoblasts spread very well on the surface of the coating. In addition, in vitro cell culture tests demonstrated cell viability and alkaline phosphatase (ALP) similar to pure HA, which indicated good cytocompatibility. Interestingly, compared with bare Ti, FAgHA/TNT-coated Ti surface was innocent for cell vitality and even more beneficial for cell osteogenesis in vitro.ConclusionEnhancing the osseointegration and preventing infection in implants, the FAgHA/TNT-coated Ti makes implants more successful.

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Section: Corrosion Behaviormentioning

confidence: 55%

Section: Corrosion Behaviormentioning

confidence: 85%

Section: Corrosion Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Nanostructured Ag+-substituted fluorhydroxyapatite-TiO2 coatings for enhanced bactericidal effects and osteoinductivity of Ti for biomedical applications

Huang

Song

Chang

et al. 2018

IJN

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“…Different coating methods have been utilized such as plasma spraying, dip coating, hot isostatic pressing, ion beam‐assisted deposition, pulsed laser deposition, sol–gel technique and electrophoretic deposition (EPD) . Among of these methods, EPD has several benefits such as better control thickness and morphology of the coating, components with complex shapes are deposited uniform, higher deposition rate than other coating technics and cheap equipment required …”

Section: Introductionmentioning

confidence: 99%

Electrochemical and biological characterization HA/Al₂O₃‐YSZ nano‐composite coatings using electrophoretic process

Askari

Yousefpour

Rajabi

2018

J Biomedical Materials Res

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In this research work, hydroxyapatite/alumina/YSZ bio nanocomposite coatings on titanium substrate were created by electrophoretic deposition (EPD) and reaction bonding process. By using the EPD process, uniform green form coatings containing HA, yttria-stabilized zirconia (YSZ), and aluminum particles were produced on titanium. After oxidation of aluminum at 660°C and sintering at 850°C, a dense and adherent HA/Al O /YSZ coating was produced. Scanning electron microscopy, X-ray diffractometric and mechanical tests were employed to investigate the morphologies, compositions, hardness, toughness and bonding strength of the coatings. The corrosion studies and cell culturing experiment were carried out and the results show that the HA/YSZ/Al O coatings are more bioactive and more resistance to corrosion than HA coatings. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1916-1922, 2018.

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Structural characterization, mechanical, and electrochemical studies of hydroxyapatite‐titanium composite coating fabricated using electrophoretic deposition and reaction bonding process

et al. 2019

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In the present work, hydroxyapatite (HA)-titanium (Ti, 20 wt%) composite coating was coated on NiTi alloy substrate by EPD (electrophoretic deposition) process.Before applying the coating, the HA powder was composed with Ti powder using a ball milling process. Influence of the ball milling time on morphology and phase structure of HA-Ti powder was evaluated using TEM and XRD analysis. After composing the HA particles with Ti, the HA-Ti composite powders were coated on the NiTi substrate by the EPD process in an n-butanol medium for 2 min, with the applied voltage of 60 V. XRD and SEM analysis were utilized to evaluate the phase analysis and morphology of the coatings. Mechanical and electrochemical characteristic of the coatings were also assessed using the micro-indentation, micro-scratch, and polarization tests, respectively. The results revealed that the milling process time had a significant influence on reaction bonds and optimum mixing time was 4 hr. Micro-hardness of the HA-Ti composite coating (304 HV) was substantially higher than the HA coating (72 HV). Also, as the HA coating was composed with Ti particles, the amount of force (in the micro-scratch test) required for detaching the coating from the NiTi substrate increased from 7.1 to 17.8 N. The polarization results showed that the HA-Ti composite coating had a higher electrochemical resistance compared with the HA coating. Corrosion resistance of the NiTi alloy coated with HA increased from 133 kΩ. cm 2 to 2,720 kΩ.cm 2 after composed with the Ti particles.

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Bioactivity and electrochemical behavior of hydroxyapatite-silicon-multi walled carbon nano-tubes composite coatings synthesized by EPD on NiTi alloys in simulated body fluid

Cited by 44 publications

References 30 publications

Nanostructured Ag<sup>+</sup>-substituted fluorhydroxyapatite-TiO<sub>2</sub> coatings for enhanced bactericidal effects and osteoinductivity of Ti for biomedical applications

Nanostructured Ag<sup>+</sup>-substituted fluorhydroxyapatite-TiO<sub>2</sub> coatings for enhanced bactericidal effects and osteoinductivity of Ti for biomedical applications

Electrochemical and biological characterization HA/Al₂O₃‐YSZ nano‐composite coatings using electrophoretic process

Structural characterization, mechanical, and electrochemical studies of hydroxyapatite‐titanium composite coating fabricated using electrophoretic deposition and reaction bonding process

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Bioactivity and electrochemical behavior of hydroxyapatite-silicon-multi walled carbon nano-tubes composite coatings synthesized by EPD on NiTi alloys in simulated body fluid

Cited by 44 publications

References 30 publications

Nanostructured Ag<sup>+</sup>-substituted fluorhydroxyapatite-TiO<sub>2</sub> coatings for enhanced bactericidal effects and osteoinductivity of Ti for biomedical applications

Nanostructured Ag<sup>+</sup>-substituted fluorhydroxyapatite-TiO<sub>2</sub> coatings for enhanced bactericidal effects and osteoinductivity of Ti for biomedical applications

Electrochemical and biological characterization HA/Al2O3‐YSZ nano‐composite coatings using electrophoretic process

Structural characterization, mechanical, and electrochemical studies of hydroxyapatite‐titanium composite coating fabricated using electrophoretic deposition and reaction bonding process

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Electrochemical and biological characterization HA/Al₂O₃‐YSZ nano‐composite coatings using electrophoretic process