Related Experiment Video
Updated: Mar 23, 2026
10:27
The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
Published on: October 11, 2016
10.0K
A systemic study on key parameters affecting nanocomposite coatings on magnesium substrates.
Ian Johnson1, Sebo Michelle Wang1, Christine Silken1
1Department of Bioengineering, University of California at Riverside, 900 University Avenue, Riverside, CA 92521, United States.
Acta Biomaterialia
|March 24, 2016
Summary
Optimizing nanocomposite coatings on magnesium alloys prevents delamination and reduces degradation. Melted and annealed hydroxyapatite/polycaprolactone coatings enhance bone cell adhesion for improved skeletal implants.
Area of Science:
- Biomaterials Science
- Orthopedic Engineering
- Nanotechnology
Background:
- Magnesium (Mg) alloys are promising for skeletal implants due to their biodegradability.
- Nanocomposite coatings offer multifunctional benefits but suffer from delamination issues.
- Improving coating adhesion and controlling Mg degradation are crucial for implant longevity.
Purpose of the Study:
- To address the delamination of nanocomposite coatings on Mg alloys.
- To optimize coating properties for reduced Mg degradation and enhanced cytocompatibility.
- To establish design guidelines for Mg-based skeletal implants.
Main Methods:
- Investigated substrate surface conditions (metallic vs. alkaline heat-treated hydroxide).
- Dispersed nanophase hydroxyapatite (nHA) in poly(lactic-co-glycolic acid) (PLGA), poly(l-lactic acid) (PLLA), and poly(caprolactone) (PCL).
- Evaluated post-deposition processing (melting, annealing) effects on coating properties.
Main Results:
- Optimized coating processes successfully mitigated delamination.
- Melted then annealed nHA/PCL coating on metallic Mg substrates exhibited the slowest degradation and best adhesion.
- Enhanced bone marrow derived mesenchymal stem cell (BMSC) adhesion was observed with the optimized coating.
Conclusions:
- Surface condition, polymer type, and post-deposition processing are key parameters for nanocomposite coating efficacy.
- Melted/annealed nHA/PCL coatings provide superior performance for Mg alloy skeletal implants.
- Rational design guidelines are provided for clinical translation of biodegradable Mg implants.
Keywords:
Biodegradable polymersBioresorbable skeletal implantsBone marrow derived mesenchymal stem cells (BMSCs)Hydroxyapatite (HA) nanoparticlesInternal stressMagnesiumNanocompositesPoly(caprolactone) (PCL)Poly(l-lactic acid) (PLLA)Poly(lactic-co-glycolic acid) (PLGA)Residual stressRevised simulated body fluid (rSBF)
