Surface modification of Ti–30Ta alloy by deposition of P(VDF-TrFE)/BaTiO3 coating for biomedical applications.
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Data
2022
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This study aims to promote an adequate methodology for coating an experimental Ti-30Ta
alloy with P(VDF-TrFE)/BaTiO3. The combination of a copolymer with a ceramic has not been used
until now. Ti-30Ta is an excellent choice to replace current alloys in the global market. The composite
deposition on the Ti-30Ta substrate was performed by a spray coating process and at low temperature
using two different surface modifications: surface acidic etching and surface polishing. Characterization was divided into four areas: (I) the substrate surface treatments used and their influences on the
adhesion process were evaluated using surface energy, wettability, and roughness analyses; (II) the
properties of the composite film, which were carried out using X-ray diffractometry (XRD), Fourier
transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and differential scanning
calorimetry (DSC); (III) the study of the adhesion of the film on the substrate, which was performed
by a scratch test; (IV) the final product, which was evaluated to determine the surface properties
after the coating process. Biofilm formation using Staphylococcus aureus and Staphylococcus epidermidis
strains and a hemocompatibility test were performed as biological assays. The results indicated that
the P(VDF-TrFE)/BaTiO3 film showed high thermal stability (up to ≈450 ◦C); the FTIR and DSC
tests indicated the presence of the β phase, which means that the material presents a piezoelectric
nature; and the scratch test showed that the samples with the polish treatment provided a better
adhesion of the film with an adhesion strength of ~10 MPa. From the SEM analysis, it was possible to
determine that the spray deposition coating process resulted in a well-applied film as evidenced by
its homogeneity. Microbiological tests showed that for Staphylococcus aureus, the bacterial growth in
the coated Ti-30Ta presented no significant differences when compared to the alloy without coating.
However, for Staphylococcus epidermidis, there was considerable growth on the coated Ti-30Ta, when
compared to the non-coated alloy, indicating that the film surface may have favored bacterial growth.
The hemolysis assay showed that the coated material presents hemocompatible characteristics when
in contact with blood cells. The results obtained indicate that the Ti-30Ta alloy coated with P(VDFTrFE)/BaTiO3
is a promising alternative for implant applications, due to its biocompatible properties,
simplicity, and low cost.
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Spray coating, Surface characterization, Biofilm adhesion
Citação
RIBEIRO, L. M. S. et al. Surface modification of Ti–30Ta alloy by deposition of P(VDF-TrFE)/BaTiO3 coating for biomedical applications. Metals, v. 12, n. 9, artigo 1409, ago. 2022. Disponível em: <https://www.mdpi.com/2075-4701/12/9/1409>. Acesso em: 03 maio 2023.