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Structural evolution of sol-gel-derived hydroxyapatite.

Dean-Mo Liu1, Quanzu Yang, Tom Troczynski

  • 1Department of Metals and Materials Engineering, University of British Columbia, Vancouver, Canada. deanmo@interchange.ubc.ca

Biomaterials
|April 2, 2002
PubMed
Summary
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This study investigates hydroxyapatite synthesis, detailing structural changes from sol to gel to ceramic. The resulting nano-scale carbonated apatite closely mimics human bone apatite structure.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Ceramic Engineering

Background:

  • Hydroxyapatite (HAp) is a key biomaterial, crucial for bone regeneration and dental applications.
  • Understanding the structural evolution during HAp synthesis is vital for controlling material properties.

Purpose of the Study:

  • To investigate the structural transformations during the synthesis of hydroxyapatite from sol to gel to ceramic.
  • To characterize the microstructural and crystallographic changes at different synthesis stages.

Main Methods:

  • Fourier transform infrared (FTIR) spectroscopy
  • X-ray diffraction (XRD)
  • Differential thermal analysis (DTA) and thermogravimetric analysis (TGA)
  • Scanning electron microscopy (SEM) and transmission electron microscopy (TEM)

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Main Results:

  • The colloidal sol, potentially oligomeric, was stable against coagulation.
  • Drying the sol formed an X-ray amorphous phosphate gel with 8-10 nm primary particles.
  • Amorphous gel transformed into crystalline apatite above 300°C, yielding nano-scale grains (20-50 nm).
  • Heat treatment between 300-400°C produced nano-scale, low-crystallinity, carbonated apatite resembling human bone apatite.

Conclusions:

  • The synthesis process allows for controlled structural evolution of hydroxyapatite.
  • The resulting carbonated apatite exhibits properties similar to biological apatite, indicating potential for bone tissue engineering.