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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
05:41

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Published on: February 23, 2017

Functionally graded hydroxyapatite coatings doped with antibacterial components.

Xiao Bai1, Karren More, Christopher M Rouleau

  • 1Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA.

Acta Biomaterialia
|December 9, 2009
PubMed
Summary
This summary is machine-generated.

Functionally graded hydroxyapatite (FGHA) coatings with silver nanoparticles were developed on titanium. These silver-infused FGHA coatings demonstrated strong adhesion, comparable to non-silvered coatings, indicating potential for biomedical applications.

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Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Nanotechnology

Background:

  • Titanium implants are widely used in orthopedics and dentistry.
  • Hydroxyapatite (HA) coatings enhance osseointegration of titanium implants.
  • Incorporating silver into HA coatings may provide antimicrobial properties.

Purpose of the Study:

  • To develop silver-incorporated functionally graded hydroxyapatite (FGHA) coatings on titanium substrates.
  • To characterize the structural, compositional, and adhesion properties of these FGHA coatings.
  • To evaluate the effect of silver incorporation on the coating's adhesion strength.

Main Methods:

  • Ion beam-assisted deposition was used to create FGHA coatings with varying silver percentages on titanium.
  • Transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) with energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were employed for characterization.
  • Pull-off tests were conducted to evaluate the adhesion strength of the coatings.

Main Results:

  • TEM and STEM-EDS confirmed the presence of nanoscale silver particles distributed throughout the FGHA coatings.
  • XRD and TEM analysis verified the presence of hydroxyapatite within the coatings.
  • Surface silver content ranged from 1.09 to 6.59 wt.%, approximately half of the bulk concentration.
  • Adhesion strengths were measured between 83+/-6 MPa and 88+/-3 MPa, comparable to silver-free FGHA (85 MPa).
  • The primary failure mode observed in adhesion tests was epoxy failure, not coating delamination.

Conclusions:

  • Silver-incorporated FGHA coatings can be successfully fabricated on titanium substrates using ion beam-assisted deposition.
  • The incorporation of silver does not compromise the adhesion strength of FGHA coatings on titanium.
  • The observed distribution of silver nanoparticles and strong adhesion suggest potential for these coatings in antimicrobial implant applications.