Polypyrrole/graphene oxide composite coating on Ti implants: a promising material for biomedical applications

Autor:	Bhavana Rikhari, S. Pugal Mani, Nallaiyan Rajendran
Rok vydání:	2020
Předmět:	Materials science Biocompatibility Graphene 020502 materials Mechanical Engineering Composite number 02 engineering and technology engineering.material Polypyrrole Paint adhesion testing Nanomaterials law.invention Dielectric spectroscopy chemistry.chemical_compound 0205 materials engineering Coating chemistry Chemical engineering Mechanics of Materials law engineering General Materials Science
Zdroj:	Journal of Materials Science. 55:5211-5229
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-019-04228-7
Popis:	Advanced materials can be developed by the combination of synthetic polymer and nanomaterial for biomedical application. Polypyrrole/graphene oxide (PPy/GO) composite coating on Ti metal was developed through electropolymerization of pyrrole by varying the amount of GO in aqueous oxalic acid solution. The influence of GO in the PPy matrix was confirmed by scanning electron microscopy studies. Structural interactions between PPy and GO in the composite coating were studied using ATR-FTIR, solid 13C NMR and Raman spectroscopy. The higher surface roughness and the lower wettability of the composite-coated Ti favor biocompatibility. The increase in adhesion strength of the composite coating was analyzed by the cross-hatch adhesion test. Potentiodynamic polarization studies showed a higher polarization resistance (Rp) and lower corrosion rates for composite coatings. Dynamic electrochemical impedance spectroscopy studies confirmed the PPy/GO composite coating exhibited a higher impedance from − 0.55 to 1.25 V in SBF solution. Bode impedance and Bode phase angle results revealed a higher resistance for PPy/GO composite-coated Ti. Immersion studies of PPy/GO composite coating in SBF solution revealed the growth of dense hydroxyapatite (Hap.) over Ti metal. Further, in vitro cell culture studies were carried out by MG-63 cells to assess the biocompatibility of PPy/GO composite coating on the substrate. Improved corrosion protection and biocompatibility behavior of PPy/GO composite-coated Ti suggests the potential candidate for biomedical applications.
Databáze:	OpenAIRE
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