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Preparation and Characterization of the HA/MWNTs and HA/TiO2 Nanotubes Composite Biomaterials

Author: ZhaoYanRong
Tutor: LinChangJian
School: Xiamen University
Course: Physical and chemical
Keywords: Hydroxyapatite Titania nanotubes Carbon nanotubes Hydrothermal Synthesis Electrophoretic deposition Mechanical properties Biological properties
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 403
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Abstract


Hydroxyapatite (HA) is the most important inorganic component of bones and teeth, synthetic HA has good biocompatibility and bioactivity, but HA brittleness, low strength, flexural strength and fracture toughness index limit its practical application in clinical characteristics of artificial dense bone. Medical titanium surface coated with HA can be combined with the metal materials with good mechanical properties and good biological properties in HA has been widely used as a human hard tissue replacement material. However, HA with a titanium substrate coefficient of thermal expansion mismatch caused by the residual stress, to reduce the bonding force between the coating and the substrate, often occur in the clinical application of the coating off or implant loosening. Titania nanotubes having a good biological activity, corrosion resistance and abrasion resistance and, therefore, the development HA / titania nanotube reinforced composite is expected to play a toughening reinforcing effect, to improve the mechanical properties of the HA coating has important The clinical value. Calcium phosphate cement (CPC) is an important hard tissue repair materials, is still facing great challenges in clinical practice has been widely used, and how to further improve the mechanical properties of the CPC, to solve its low compressive and flexural strength mechanical problems , carbon nanotubes (CNTs) has a unique mechanical properties, so the development of the CPC / CNTs composite, is expected to get the excellent mechanical properties of fiber reinforced materials, and one of the key issues is the need to address the CPC / CNTs composite biological safety problem. In response to the key issues, this paper Hydrothermal Preparation of HA / TiO 2 nanotubes and HA / MWNTs composite reinforcement for the excellent mechanical properties of hard tissue substitute materials and bone cement hard tissue repair material provide a basis. Research results and developments are as follows: 1. Hydrothermal method, P-25 as raw material to maintain the solid-liquid than 1.5g/140mL, hydrothermal reaction for 48 h in 10 mol / L NaOH solution was successfully prepared titania nanotube powder body, the diameter of the nanotube 8 to 10 nm, a length of about a few microns; 2 for the first time by electrophoretic deposition method, the surface of the titanium-coated HA / titania nanotubes gradient composite coating treated after calcined at 700 ℃ for 2 hours, the prepared HA / TiO 2 nanotubes gradient composite coating shear force reached to 32.97 ± 2MPa (shearing force between the general HA coating and the substrate to 19.82 ± 3 MPa), close to the bearing strength of the human bone ( 35MPa); big load scratch test results show that the gradient composite coating and the Ti substrate binding force between the binding force between the pure HA coating and the Ti substrate increased by about 2.3 times. The calcination temperature on the electrophoretic deposition of the coating and the substrate binding force between the results show that calcined at 700 ℃ 2h to be effective in the HA coating toughening and strengthening; 3. Chemical co-precipitation and hydrothermal processing, HA / MWNTs macro biomaterials prepared, when accounting for 15% of the content of carbon nanotubes in composites the MWNTs with HA role, can close in the the MWNTs surface covering layer of pure nano-HA grains film layer. After calcined at 700 ℃, and found that the combination of HA and MWNTs further strengthen the surface of MWNTs to form a more compact and uniform HA film; vitro cell culture experiments show that there is no obvious toxicity, containing 15% of MWNTs HA / MWNTs composite with good biocompatibility.

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