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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications
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Hydroxyapatite/titania composite bioactivity coating processed by the sol-gel method.

J Y Han1, Z T Yu, L Zhou

  • 1Northwestern Polytechnical University, No. 127, Youyi Street, Xi'an, 710072, People's Republic of China. nwpuhanjy@sina.com.cn

Biomedical Materials (Bristol, England)
|November 26, 2008
PubMed
Summary
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This study developed a hydroxyapatite/titania composite coating on titanium using sol-gel methods. The titania addition enhanced the coating's porous structure and improved its corrosion resistance.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Surface Chemistry

Background:

  • Titanium (Ti) is widely used in biomedical implants due to its biocompatibility.
  • Enhancing the surface properties of titanium, such as corrosion resistance and bioactivity, is crucial for implant performance.
  • Hydroxyapatite (HA) and titania (TiO2) are known for their biocompatibility and desirable surface characteristics.

Purpose of the Study:

  • To develop a novel hydroxyapatite/titania (HA/TiO2) composite coating on a pure titanium substrate.
  • To investigate the effect of TiO2 addition on the structural and corrosion properties of HA coatings.
  • To explore the potential of sol-gel methods for creating advanced biomaterial coatings.

Main Methods:

  • Sol-gel synthesis of separate hydroxyapatite (HA) and titania (TiO2) sols.

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  • Mixing of HA and TiO2 sols to form a composite sol.
  • Spin coating of the composite sol onto a pure titanium (Ti) substrate.
  • Drying and heat treatment of the coated samples at elevated temperatures.
  • X-ray diffraction (XRD) analysis to study crystallization and phase evolution.

    • Main Results:

    • XRD analysis indicated improved crystallization and grain growth with increasing heat treatment temperature.
    • The incorporation of TiO2 was observed to delay HA crystallization and accelerate its decomposition.
    • The resulting HA/TiO2 composite coating exhibited a porous surface structure.
    • The addition of TiO2 significantly enhanced the corrosion resistance of the HA coating on the Ti substrate.

    Conclusions:

    • The sol-gel method is effective for fabricating HA/TiO2 composite coatings on titanium.
    • TiO2 incorporation modifies the crystallization behavior of HA and improves the coating's structural properties.
    • The HA/TiO2 composite coating demonstrates superior corrosion resistance compared to pure HA coatings.
    • This composite coating holds promise for applications requiring enhanced titanium implant performance.