Hydroxyapatite/poly(Éε-caprolactone) double coating on magnesium for enhanced corrosion resistance and coating flexibility

Ji Hoon Jo, Yuanlong Li, Sae Mi Kim, Hyoun Ee Kim, Young-Hag Koh

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Hydroxyapatite was deposited on pure magnesium (Mg) with a flexible poly(Éε-caprolactone) interlayer to reduce the corrosion rate of Mg and enhance coating flexibility. The poly(Éε-caprolactone) interlayer was uniformly coated on Mg by a spraying method, followed by hydroxyapatite deposition on the poly(Éε-caprolactone) using an aerosol deposition method. In scanning electron microscopy observations, inorganic/organic composite-like structure was observed between the hydroxyapatite and poly(Éε-caprolactone) layers, resulting from the collisions of hydroxyapatite particles into the poly(Éε- caprolactone) matrix at the initial stage of the aerosol deposition. The corrosion resistance of the coated Mg was examined using potentiodynamic polarization tests. The hydroxyapatite/poly(Éε-caprolactone) double coating remarkably improved the corrosion resistance of Mg in Hank's solution. In the in vitro cell tests, the coated Mg showed better cell adhesion compared with the bare Mg due to the reduced corrosion rate and enhanced biocompatibility. The stability and flexibility of hydroxyapatite/ poly(Éε-caprolactone) double coating was investigated by scanning electron microscopy inspections after the coated Mg was deformed. The hydroxyapatite coating on the poly(Éε-caprolactone) interlayer revealed enhanced coating stability and flexibility without cracking or delamination during bending and stretching compared with the hydroxyapatite single coating. These results demonstrated that the hydroxyapatite/ poly(Éε-caprolactone) double coating significantly improved the surface corrosion resistance of Mg and enhanced coating flexibility for use of Mg as a biodegradable implant.

Original languageEnglish
Pages (from-to)617-625
Number of pages9
JournalJournal of Biomaterials Applications
Volume28
Issue number4
DOIs
Publication statusPublished - 2013 Nov 1

Fingerprint

Durapatite
Hydroxyapatite
Magnesium
Corrosion resistance
Coatings
Aerosols
Corrosion rate
polycaprolactone
Scanning electron microscopy
Potentiodynamic polarization
Cell adhesion
Spraying
Biocompatibility
Delamination
Stretching
Inspection
Composite materials

Keywords

  • biodegradation
  • flexibility
  • hydroxyapatite coating
  • Magnesium
  • poly(Éε-caprolactone) interlayer

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

Cite this

Hydroxyapatite/poly(Éε-caprolactone) double coating on magnesium for enhanced corrosion resistance and coating flexibility. / Jo, Ji Hoon; Li, Yuanlong; Kim, Sae Mi; Kim, Hyoun Ee; Koh, Young-Hag.

In: Journal of Biomaterials Applications, Vol. 28, No. 4, 01.11.2013, p. 617-625.

Research output: Contribution to journalArticle

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