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RISS 인기검색어
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- 저자 : S.P. Vinodhini (검색결과 2 건)
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Bioresorbable whitlockite coatings on titanium by EPD for biomedical applications
S.P. Vinodhini,B. Venkatachalapathy,T.M. Sridhar 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.9
We have developed biodegradable tri calcium phosphate [Ca3(PO4)2 , β-TCP (whitlockite)] coatings on titanium by surfacemodification to improve the corrosion resistance and biocompatibility. It is a bioresorbable biomaterial and is absorbed forthe formation of new bone tissues. Nano whitlockite powder was synthesized by wet chemical precipitation method and coatedon titanium surfaces by electrophoretic deposition (EPD) from a 1.5% suspension in ethanol. The coatings were carried outat various potentials ranging from 10-50 V and were followed by sintering in vacuum at 800 oC for 1 hr. The crystallinity,vibrational states, surface morphology and composition of the coatings were characterized by XRD, FTIR, and FE-SEM withEDAX respectively. The corrosion resistance of the coating was further evaluated electrochemically to study the stability of thecoatings using open circuit potential-time measurements, potentiodynamic polarization studies and impedance behavior in Ringer’ssolution. The electrochemical corrosion parameters evaluated indicate a shift towards noble direction for the whitlockite coatedsamples in comparison with uncoated titanium metal. Electrochemical impedance spectroscopic investigations revealed the stablenature of the coatings formed. In vitro cytotoxicity studies of the coated material were carried out by MTT assay. The stable natureof the cells confirms the biocompatibility of whitlockite coatings on the titanium substrate.
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Joseph Raj Xavier,Vinodhini S.P. 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
The surface treated nano Zr2C by (3-aminopropyl)tris[2-(2-methoxyethoxy)ethoxy]silane (APTMEES)was mixed with graphene oxide (GO), and the resulting GO-APTMEES/Zr2C nanofiller was integrated intothe epoxy resin (EP). Electrochemical impedance spectroscopy (EIS), polarization, and scanning electrochemicalspectroscopy (SECM) tests were used to evaluate the protection efficiency of epoxy coatingon mild steel in the presence of varied concentrations of GO/APTMEES-Zr2C in seawater. The ideal weightproportion of GO-APTMEES/Zr2C in the epoxy matrix was discovered to be 2.0, which resulted in bettercoating performance. After 1 h of exposure to the marine environment, the coating resistance of EP-GO/APTMEES-Zr2C was determined to be over 44.9 times higher than that of pure matrix. Even after 180 h inseawater, EIS tests revealed an improved coating resistance of EP-GO/APTMEES-Zr2C nanocomposite(6366.24 kO.cm2). Because of the coated substrate’s superior resistance to anodic dissipation, SECM measurementsrevealed the least discharge of Fe2+ ions at the scratch of the EP-GO/APTMEES-Zr2C coating(1.2 I/nA). Zr2C was found in the rusted components, forming an outstanding inert film at the surface,according to FE-SEM/EDX analysis. The newly produced EP-GO/APTMEES-Zr2C composite had improvedbarrier properties and hydrophobic characteristics (WCA: 161), according to the findings. The mechanicalcharacteristics of the epoxy matrix increased when GO-APTMEES/Zr2C was added. As a result, the EPGO/APTMEES-Zr2C nanocomposite could be used as a coating material for industrial purposes.
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