Morphology and composition of nanograde calcium phosphate needle-like crystals formed by simple hydrothermal treatment View Full Text


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Article Info

DATE

1994-06

AUTHORS

Li Yubao, K. De Groot, J. De Wijn, C. P. A. T. Klein, S. V. D. Meer

ABSTRACT

Nanograde calcium phosphate needle-like crystals are prepared from wet synthesized Ca−P precipitates by simple hydrothermal treatment at 140°C and 0.3 MPa for 2 h. The morphology of these crystals is observed by transmission electron microscopy (TEM). The phase composition is tested through X-ray diffractometer (XRD) and infrared spectroscopy (IR). It is found that the morphology of these crystals is related to the activity or fresh degree of the starting Ca−P precipitates and the added fluorine ions, but is not greatly influenced by the Ca/P ratio of the precipitates. These crystals with a Ca/P ratio between 1.67 and 1.5 show a poorly crystallized apatite structure at room temperature and a biphasic (HA+β−TCP) structure at 1100°C, corresponding to their Ca/P ratio. It is demonstrated that these nonstoichiometric apatite crystals contain lattice-bound water which could play an important role in the formation of bone apatite. The similarity in morphology and composition between these needle-like crystals and the apatite crystals in bone provides a possibility to make a bone-like implant consisting of these needle-like crystals and collagen, etc. More... »

PAGES

326-331

References to SciGraph publications

  • 1985-11. A low-angle X-ray diffraction analysis of osteonic inorganic phase using synchrotron radiation in CALCIFIED TISSUE INTERNATIONAL
  • 1990-10. Carbonate-doped hydroxyapatite in JOURNAL OF MATERIALS SCIENCE: MATERIALS IN MEDICINE
  • 1976-11. Hydroxylapatite synthesis and characterization in dense polycrystalline form in JOURNAL OF MATERIALS SCIENCE
  • 1993-01. High temperature characteristics of synthetic hydroxyapatite in JOURNAL OF MATERIALS SCIENCE: MATERIALS IN MEDICINE
  • 1992. Biomaterials, An Introduction in NONE
  • 1973-12. Hydrazine-deproteinated bone mineral in CALCIFIED TISSUE RESEARCH
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    http://scigraph.springernature.com/pub.10.1007/bf00058956

    DOI

    http://dx.doi.org/10.1007/bf00058956

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