Abstract
Nanocomposites consisting of gelatin and hydroxyapatite as well as of gelatin and mixtures of hydroxyapatite and different amounts of octacalcium phosphate were prepared as bulk-materials. The composites were precipitated from aqueous solutions of CaCl2·2H2O and (NH4)2(HPO4), respectively, with varying amounts of gelatin at 25 °C and pH 7. The influence of prestructuring effects of calcium and phosphate ions, respectively, on gelatin and by this on the precipitated materials was investigated in detail. X-ray-diffraction (XRD), energy dispersive X-ray spectroscopy (EDXS), and high-resolution transmission electron microscopy (HR-TEM) revealed that the prestructuring components as well as the total amount of gelatin involved in the reactions have a substantial influence on the composition and shape of the nanocomposites formed. In the case of CaCl2·2H2O used as the prestructuring agent for gelatin, hydroxyapatite is the inorganic phase obtained, independent of the initial amount of gelatin. By the prestructu...
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