Synthesis, microstructure and biodegradation behavior of MgO-TiO2-PCL nanocomposite coatings on the surface of magnesium-based biomaterials

•PEO is a promising technique for the modification of Mg-based biomaterials.•MgO-TiO2 coatings can be applied on the surface of Mg-based biomaterials.•The porous nature of the PEO coating could not provide desired corrosion resistance.•A uniform top-layer PCL coating significantly improves the chara...

Full description

Saved in:
Bibliographic Details
Published in:Materials letters 2022-03, Vol.310, p.131142, Article 131142
Main Authors: Amukarimi, Shukufe, Mobasherpour, Iman, Yarmand, Benyamin, Brouki-Milan, Peiman, Mozafari, Masoud
Format: Article
Language:English
Subjects:
Biodegradability
Biodegradation
Biomaterials
Biomedical materials
Body fluids
Corrosion resistance
Dip coatings
Immersion coating
Magnesium oxide
Magnesium-based implants
Materials science
Microstructure
Nanocomposites
Nanoparticles
Oxidation
Polycaprolactone
Protective coatings
Substrates
Superconductors (materials)
Surface modification
Surgical implants
Titanium
Titanium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•PEO is a promising technique for the modification of Mg-based biomaterials.•MgO-TiO2 coatings can be applied on the surface of Mg-based biomaterials.•The porous nature of the PEO coating could not provide desired corrosion resistance.•A uniform top-layer PCL coating significantly improves the characteristics of the surface.•PCL top-layer coated MgO-TiO2 composite can control the substrate’s degradation rate.•The proposed coating system is able to locally deliver therapeutic molecules. In this study, a magnesium oxide-titanium dioxide (MgO-TiO2) nanocomposite film was successfully applied to pure magnesium (Mg) surface using the plasma electrolytic oxidation (PEO) technique in an electrolyte solution containing TiO2 nanoparticles. A uniform top-layer polycaprolactone (PCL) coating was eventually formed on the PEO-treated Mg through a dip-coating process. The results indicated that the porous nature of the PEO-coated samples could not provide the desired corrosion resistance in simulated body fluid (SBF). However, the deposition of the top-layer PCL coating (utilizing 8wt% PCL) over the MgO-TiO2 nanocomposite coating greatly improved the corrosion resistance of the Mg substrate. The proposed PCL top-layer coated MgO-TiO2 nanocomposite film could be considered as a promising candidate for the surface modification of Mg-based biodegradable implants. Due to the microstructural and macrostructural porous nature of the PEO film, this coating can be further used on the surface of biodegradable implants not only to control the degradation rate but also to deliver therapeutic molecules.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2021.131142