Corrosion behavior of polypyrrole/hydroxyapatite nanocomposite thin films electropolymerized on NiTi substrates in simulated body fluid

Torabi, Morteza; Sadrnezhaad, S.K.

doi:10.1002/maco.200905399

Cited by 24 publications

(16 citation statements)

References 27 publications

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“…It has the advantages of simplicity, reproducibility, low cost, and ease of producing (even in bulk quantities) of nanostructured materials [9,10]. The outstanding biological potentials of nanostructured biomaterials, which have not been observed in the conventional polycrystalline coarse grained materials, have been reported by previous studies [11][12][13].…”

Section: Introductionmentioning

confidence: 96%

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

2017

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Abstract. Nanostructured copper-doped uorapatite (Cu x .Ca (10 x) .(PO 4 ) 6 .F 2 ) having crystallite sizes of 19, 29, and 34 nm at x = 0:9, 0.4, and 0.0, respectively, was synthesized by planetary ball milling of CaO, P2O5, CaF2, and CuO powders. Speci cations of the products were determined by Fourier-transform infrared spectroscopy, eld emission scanning electron microscopy, transmission electron microscopy, and X-ray di raction analyses. In-vitro studies and Mossman's Tetrazole Test (MTT) assays were also conducted by incubating Cu x .Ca (10 x) .(PO 4 ) 6 .F 2 powder into Kokubo's Simulated Body Fluid (SBF) and against BT-20 cell, respectively, to determine bioactivity and biocompatibility of the materials. Antibacterial e ects on Staphylococcus aureus were assessed by the disc di usion test method. Measurements showed that the rate of formation of uorapatite was lowered by Cu content. Besides, in-vitro experiments showed the same SBF interacted apatite precipitation for all samples. In contrast, MTT assays revealed di erent behavior for pure uorapatite and apatite with x = 0:9 Cu against BT-20 cell after 24 h of incubation. This highlights the increase of uorapatite cytotoxicity when Cu ion is present in the apatite structure. Copper-doped uorapatite was, however, desirably antibacterial. This stemmed from copper ions interactions with the bacterial metabolism which resulted in enzymes neutralization and copper-doped uorapatite antibacterial behavior.

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Section: Introductionmentioning

confidence: 96%

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

2017

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“…2 Research efforts have been directed to the elimination of Ni release from the surface and therefore improving the corrosion resistance and as well as the biocompatibility of the implants. [1][2][3][4][5] Nickel is known for its diverse effects on human body, including allergic reactions and toxicity. 6 Studies on commercially available orthodontic wires showed increased Ni release rate with time of exposure and type of solution, indicating the need for better understanding the processes at the interface between the implant and biological environment.…”

Section: Introductionmentioning

confidence: 99%

“…2,7 Various surface modification techniques have been used including mechanical, chemical and thermal treatments, as well as bioactive coatings such as calcium phosphate coatings. 4,5,8,9 Hydroxyapatite coatings (HAP) are appropriate candidates for biocompatibility improvement since they offer an excellent surface for cell growth. 8,10 However, they cannot be used in load-bearing applications due to their poor mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of a hydroxyapatite coating on a biocompatible NiTi alloy

Kocijan¹

2018

Mater. Tehnol.

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The electrodeposition method was used to apply a hydroxyapatite coating (HAP) on the surface of a biocompatible NiTi alloy with the aim to enhance the corrosion resistance of the substrate and therefore decrease the release of nickel ions from the surface of the alloy. A uniform inner layer of HAP was formed and overlaid by clusters of spherical and flake-like morphological structures. The HAP coating exhibited super-hydrophilic wetting properties compared to the moderate hydrophilicity of the NiTi alloy. The barrier properties of the HAP coating were investigated by using potentiodynamic measurements. The HAP coating significantly enhanced the corrosion resistance of the NiTi alloy and confirmed the effective barrier properties of the coating, which can be used to minimise the nickel release in biomedical applications. Keywords: electrodeposition, hydroxyapatite, NiTi alloy, SEM Za{~itna plast hidroksiapatita je bila z elektrodepozicijo nane{ena na povr{ino biokompatibilne zlitine NiTi z namenom izbolj{anja korozijskih lastnosti substrata in zmanj{anja izlo~anja nikljevih ionov. Tvorila se je zvezna notranja plast hidroksiapatita, ki je bila prekrita s skupki okroglih in podolgovatih morfolo{kih struktur. Z meritvami stati~nih kontaktnih kotov smo potrdili superhidrofilne lastnosti hidroksiapatitne prevleke v primerjavi z zmerno hidrofilnostjo osnovnega materiala. S potenciodinamskimi meritvami smo potrdili, da se z nanosom za{~itne plasti izrazito izbolj{a korozijska obstojnost zlitine NiTi in s tem predstavlja ustrezno bariero za prepre~evanje izlo~anja nikljevih ionov v biomedicinskih aplikacijah.

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“…shape memory effect, superelasticity and high damping capacity [1][2][3][4]. As a metal material for medical implant, it should be resistant to corrosion to ensure long service life and to minimize its adverse biologic effect.…”

Section: Introductionmentioning

confidence: 99%

“…Polypyrrole (PPy) is particularly attractive due to its high conductivity, stability, ease of synthesis and especially very good tissue compatibility [2,10,16]. Moreover, PPy coating can be electrodeposited directly on the alloy surface easily [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The Protection Performance of Polypyrrole Coating Doped with Different Counter Anions for the Corrosion of NiTi Alloy

Qi¹

2011

TOCORRJ

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Abstract:The electrochemical corrosion behavior of NiTi alloy electrodeposited conductive polypyrrole (PPy) coatings doped with small size sulfate (SO4 2 ), medium size para-toluene sulfonate (pTS ) and large size dodecylbenzene sulfonate (DBS ) counter anions has been studied by electrochemical measurements and surface analysis. It is demonstrated that PPy coatings inhibit the corrosion of NiTi substrate in chloride solution by shifting the corrosion potential and pitting potential positively and increasing the impedance of corrosion process. The protective performance of PPy coatings for NiTi alloy is in the order: PPy/pTS < PPy/SO 4 < PPy/DBS. The protective performance of the doped PPy coatings for NiTi alloy is related to their anions exchange abilities. The worse anion exchange ability PPy coating has, the better protective performance. The increase of solution pH increases the corrosion rate of the coated NiTi substrate.

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Corrosion behavior of polypyrrole/hydroxyapatite nanocomposite thin films electropolymerized on NiTi substrates in simulated body fluid

Cited by 24 publications

References 27 publications

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

Effect of Cu2+ ion on Biological Performance of Nanostructured Fluorapatite Doped with Copper

Electrodeposition of a hydroxyapatite coating on a biocompatible NiTi alloy

The Protection Performance of Polypyrrole Coating Doped with Different Counter Anions for the Corrosion of NiTi Alloy

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