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Influence of process parameters on the sol–gel synthesis of nano hydroxyapatite using various phosphorus precursors

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Abstract

Hydroxyapatite Ca10(PO4)6(OH)2 has attracted widespread interest from both orthopedic and dental fields due to its excellent biocompatibility and tissue bioactivity properties. Since nanophase materials can mimic the dimensions of constituent components of natural tissues, the implants developed from nanophase material could serve as a successful alternative. However, the defects of hydroxyapatite ceramics, mainly brittleness and low fracture toughness, have been overcome by the use of nanophase hydroxyapatite coatings on the implant surfaces that integrate the good mechanical properties of metals and the bioactivity of hydroxyapatite. In the present investigation, Sol–gel hydroxyapatite was prepared from two different phosphorus precursors such as triethyl phosphate and phosphorus pentoxide respectively with calcium nitrate tetrahydrate as a calcium precursor. The effects of pH and liquid P31 Nuclear Magnetic Resonance spectroscopy for the solution aged at different periods were investigated and the synthesized hydroxyapatite powder was characterized by Transmission electron microscopy, X-ray Powder Diffraction, Fourier transform infrared spectroscopy and thermal analysis respectively. In order to fully understand the bioactivity of the synthesized materials, they were coated on 316L Stainless Steel implant surface by spin coating method at the spin speed of 2,000 Revolutions per minute. The effect of nanoparticles on the surface of 316L Stainless Steel implant was studied by adhesive strength measurements. The corrosion resistance property of the hydroxyapatite coatings was evaluated by electrochemical impedance analysis. From the results, it was observed that the hydroxyapatite coatings obtained from different precursors have very high resistance to corrosion with higher adhesive strength.

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Authors and Affiliations

  1. Materials Science Division, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Vellore, 632 014, India

    U. Vijayalakshmi

  2. Department of Analytical Chemistry, University of Madras, Guindy Campus, Chennai, 600 025, India

    S. Rajeswari

Authors
  1. U. Vijayalakshmi
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  2. S. Rajeswari
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Correspondence to U. Vijayalakshmi.

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Vijayalakshmi, U., Rajeswari, S. Influence of process parameters on the sol–gel synthesis of nano hydroxyapatite using various phosphorus precursors. J Sol-Gel Sci Technol 63, 45–55 (2012). https://doi.org/10.1007/s10971-012-2762-2

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  • DOI: https://doi.org/10.1007/s10971-012-2762-2

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