Functionally Graded Hydroxyapatite Coatings Doped with Antibacterial Components

Journal Article · Fri Jan 01 04:00:00 EST 2010 · Acta Biomaterialia

DOI:https://doi.org/10.1016/j.actbio.2009.12.002· OSTI ID:981777

Bai, Xiao ^[1]; More, Karren Leslie ^[1]; Rouleau, Christopher M ^[1]; Rabiei, Afsaneh ^[1]

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1. ORNL

A series of functionally graded hydroxyapatite (FGHA) coatings incorporated with various percentages of silver were deposited on titanium substrates using ion beam assisted deposition (IBAD). The analysis of the coating s cross-section using transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM), equipped with energy dispersive X-ray spectroscopy (EDS), has shown a decreased crystallinity as well as a distribution of nano scale (10 ~ 50nm) silver particles from the coating/substrate interface to top surface. Both X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR) results revealed the presence of hydroxyapatite within the coatings. The amount of Ag (wt. %) on the outer surface of the FGHA, as determined from X-ray photoelectron spectroscopy (XPS), ranged from 1.09 ~ 6.59, which was about half of the average Ag wt. % incorporated in the entire coating. Average adhesion strengths evaluated by pull-off tests were in the range of 83 6 - 88 3 MPa, which is comparable to 85 MPa for FGHA without silver. Further optical observations of failed areas illustrated that the dominant failure mechanism was epoxy failure and FGHA coating delamination was not observed.

• Research Organization: Oak Ridge National Laboratory (ORNL); Center for Nanophase Materials Sciences
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 981777
• Journal Information: Acta Biomaterialia, Journal Name: Acta Biomaterialia Journal Issue: 6 Vol. 6; ISSN 1742-7061
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADHESION
APATITES
COATINGS
CRYSTAL STRUCTURE
ENERGY BEAM DEPOSITION
FAILURE MODE ANALYSIS
HYDROXY COMPOUNDS
SILVER
SUBSTRATES
TITANIUM