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Nanocrystalline stoiochiometric calcium hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 (NCHA), a counter part of the inorganic osseous tissue component, is synthesized under biomimetic conditions. Methods of physico chemical analysis (XRD, IRS, derivatography, DSC, ESCA, SEM, TEM) are used to identify the products of synthesis. The temperature dependence of thermally stimulated currents (TSCs) of NCHA is studied in the temperature range of 300-600 K and the effect of the dispersion degree on TSCs is analyzed.

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The influence of methylcellulose ([C 6 H 7 O 2 (OH) 3 -x (OCH 3 ) x ] n , MC) on the morphology and solubility of calcium hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , GA) nanocrystals (NCs) in GA/MC organomineral nanocomposites (OMCs) is studied. GA/MC OMCs with the MC content of 0.5, 1, 2, 5, 10 and 20 wt % are synthesized in the Ca(OH) 2 -H 3 PO 4 -[C 6 H 7 O 2 (OH) 3 -x (OCH 3 ) x ] n -H 2 O system under biomimetic condi tions (37°C). The composition and structural features of OMCs, as well as crystallographic characteristics, size, and morphology of GA NC in OMCs, are determined via chemical analysis, X ray diffraction (XRD), infrared spectroscopy (IRS), thermal analysis (DTA and DTG), scanning (SEM) and transmission (TEM) electron microscopy, and electron diffraction (ED). It is shown that the growth in the MC concentration in OMCs leads to the change in the GA NC morphology and the increase in their solubility (for Ca 2+ and ions).