engleski

Kinetics of Hydroxyapatite Formation from Cuttlefish Bones

Hydrothermal method of synthesis hydroxyapatite scaffolds from aragonitic cuttlefish bones, (Seppia Officinalis L., Adriatic Sea), at temperatures 180°C and 200°C for 1 to 48 hours is described. The phase composition of the bone and converted samples were examined by: X-ray diffraction and Fourier transform infrared spectroscopy. The rate of transformation was studied by quantitative X-ray diffraction using Rietveld refinement method, and Johnson-Mehl-Avrami approach was used to follow the transformation kinetics. The mechanism of hydroxyapatite formation could be defined as diffusion controlled growth of HAp crystals with the dominant growth along to the c-axis. FTIR spectroscopy determined B-type substitution of CO32– groups, (i.e., on the tetrahedral PO43– sites) into the structure. The microstructure of native and transformed bones was studied by scanning electron microscopy. The natural, porous and interconnected structure of bones maintained through the hydrothermal treatment, and hydroxyapatite crystals have needle like shape.

hydroxyapatite; cuttlefish; XRD; FTIR; Kinetics

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