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Information Journal Paper

Title

Synthesis and Characterization of Nano-Hydroxyapatite/mPEG-b-PCL Composite Coating on Nitinol Alloy

Pages

  98-104

Abstract

 In this study the bioactivity of hydroxyapatite/poly(ε-caprolactone)– poly(ethylene glycol) bilayer coatings on Nitinol superelastic alloy was investigated. The surface of Nitinol alloy was activated by a thermo-chemical treatment and hydroxyapatite coating was electrodeposited on the alloy, followed by applying the polymer coating. The surface morphology of coatings was studied using FE-SEM and SEM. The data revealed that the hydroxyapatite coating is composed of one-dimensional nano sized flakes and the polymer coating is uniformly covered the sublayer. Also, High resolution TEM studies on the hydroxyapatite samples revealed that each flake contains nano-crystalline grains with a diameter of about 15 nm. The hydroxyapatite monolayer coating was rapidly covered by calcium phosphate crystals (Ca/P=1. 7) after immersion in simulated body fluid confirming the bioactivity of the nanostructured flakes. However, the flakes were weak against applied external forces because of their ultra-fine thickness. Scratch test was applied on hydroxyapatite/ polymer coating to evaluate delamination of the coating from substrate. It was shown that, the polymer coating has a great influence on toughening the hydroxyapatite coating. To assess the degradation effect of the polymer layer on hydroxyapatite coating, samples were immersed in phosphate-buffered saline at 37 ᵒ C. SEM studies on the samples revealed that the beneath layer of hydroxyapatite appears after 72 h without any visible change in morphology. It seems that, application of a biodegradable polymer film on the nanostructured hydroxyapatite coating is a good way to support the coating during implantation processes.

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    APA: Copy

    Etminanfar, Mohamadreza, KHALIL ALLAFI, JAFAR, & Jalili, Kiyumars. (2017). Synthesis and Characterization of Nano-Hydroxyapatite/mPEG-b-PCL Composite Coating on Nitinol Alloy. JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS, 50(2), 98-104. SID. https://sid.ir/paper/347437/en

    Vancouver: Copy

    Etminanfar Mohamadreza, KHALIL ALLAFI JAFAR, Jalili Kiyumars. Synthesis and Characterization of Nano-Hydroxyapatite/mPEG-b-PCL Composite Coating on Nitinol Alloy. JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS[Internet]. 2017;50(2):98-104. Available from: https://sid.ir/paper/347437/en

    IEEE: Copy

    Mohamadreza Etminanfar, JAFAR KHALIL ALLAFI, and Kiyumars Jalili, “Synthesis and Characterization of Nano-Hydroxyapatite/mPEG-b-PCL Composite Coating on Nitinol Alloy,” JOURNAL OF ULTRAFINE GRAINED AND NANOSTRUCTURED MATERIALS, vol. 50, no. 2, pp. 98–104, 2017, [Online]. Available: https://sid.ir/paper/347437/en

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