Preparation of PCLF/Si–Mg–FA Nanocomposite Coating on Ti-based Alloy: Synthesis, Corrosion behavior and Cytocompatibility

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Abstract
In the present study, polycaprolactone fumarate (PCLF) and polycaprolactone fumarate/silicon and magnesium codoped fluorapatite nanoparticles (PCLF/Si–Mg–FA nanocomposite) were deposited on the surface of Ti–6Al–4V alloy via dip-coating technique. The adhesion test, scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS), X-ray diffraction (XRD) technique, Fourier transform infrared spectroscopy (FTIR), electrochemical, and in vitro biocompatibility evaluations were utilized to characterize coated and uncoated specimens. The results show that uniform nanocomposite coating (thickness of about 6.65 µm) with appropriate adhesion strength and a homogeneous distribution of Si-Mg-FA nanoparticles throughout the PCLF matrix was coated on the substrate. The potentiodynamic polarization and electrochemical impedance tests, in agreement with each other, indicated higher corrosion resistance of nanocomposite coating in comparison to uncoated and PCLF-coated specimens. Cell cytotoxicity (MTT) evaluation and cell adhesion examinations show no toxicity and represent a good cell attachment with flattened sheet morphologies for nanocomposite coating.

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