Preparation and Characterisation of Titania-hydroxyapatite-carbon
Nanotube Nanostructured Bioceramics by Sol-gel Process

Majidnia, Elahe | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41301 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Mohammadi, Mohammad Reza
  7. Abstract:
  8. Hydroxyapatite (HA) is an attractive biomaterial due to its close chemical composition to bone and teeth. However, HA is brittle and has low strength under bearing loads, resulting in limition for orthopedic and dental applications. Two creative approaches have been developed to overcome this problem, using bioactive HA as coatings on metallic implants or as ceramic/metal composites. Carbon nanotubes (CNT) possess excellent mechanical properties to play the role as reinforcement for imparting strength and toughness to brittle hydroxyapatite (HA) bioceramic coating. Moreover, The addition of TiO2 to HA coatings has attracted considerable attention, since TiO2 is capable of increasing the bonding strength between HA coating and the substrate. Functionally graded TiO2-HA and TiO2-HA-CNT coatings were deposited on pure Ti substrate by sol-gel process. The microstructure and morphology were characterised using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (FESEM), Atomic force microscope (AFM) and transmission electron microscope (TEM). The results showed that the deposited coating was homogeneous, rough and porous, containing well distributed multiwalled CNT as reinforcement material in TiO2/HA matrix. It was found that CNT improved the fracture toughness and crystallinity of TiO2-HA material. Furthermore, in vitro electrochemical studies revealed that corrosion resistance of TiO2-HA -CNT composite inhanced in the simulated body fluid
  9. Keywords:
  10. Titanium Dioxide ; Hydroxyapatite ; Sol-Gel Method ; Carbon Nanotubes Nanocomposites ; Substrates ; Coating ; Bioceramic

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