Paper Title:
Comparison of Calcium CPP, HAp and TeCP Phosphates, Obtained by Direct Reaction
  Abstract

In bioscience, there are several apatites constituteds by differents compositions. In the biological environment, apatites are found in bones and teeth of vertebrates with Ca/P ration from 2.0 to 0.5. It is not easy to determine the exact proportion of Ca2 + and PO43- in solution in the preparation of the process. In this study, apatites with Ca/P ration 1.0, 1.67 and 2.0 were prepared by direct reaction in an solution of H3PO4 in a suspension of Ca(OH)2, of same molarity, evalueting the crystallinity of CPP, Hap e TeCP with 1 mol/l, 3 mol/l and 5 mol/l. The samples characterized by X-ray diffraction (XRD) were compared with the standard of reference of the data base JCPDS. The composition of calcium phosphate for the differents molarity studied, resulted in a combination of phases with the exception of hydroxyapatite Ca/P ration 1.67 at concentrations 1 mol/l and 3 mol/l. But the diffractograms revealed that the increased molarity provided a decrease of some peaks of reflection of calcium phosphates with Ca/P ration 1.67. However, for the Ca/P ration 1.0 increasing the concentration, showed an increase of crystallinity of calcium phosphates. The FTIR confirmed the presence of phosphates in the spectrums around 1045 cm-1. The calcium phosphates obtained through direct reaction showed Ca/P ration is related with the technique employed, consolidating it in the preparation of these bioceramics.

  Info
Periodical
Key Engineering Materials (Volumes 396-398)
Main Theme
Edited by
Marcelo Prado and Cecília Zavaglia
Pages
557-560
DOI
10.4028/www.scientific.net/KEM.396-398.557
Citation
S. V. de Oliveira, M. V. L. Fook, E. P. Araújo, A.C.B.M. Fook, R.S.C. Lima, W.P.F. Barbosa, "Comparison of Calcium CPP, HAp and TeCP Phosphates, Obtained by Direct Reaction", Key Engineering Materials, Vols. 396-398, pp. 557-560, 2009
Online since
October 2008
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