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An organic-mineral composite of hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 ) nanoparticles and carboxymethyl cellulose (CMC) is synthesized via coprecipitation from a solution containing CaCl 2 , aqueous ammonia, (NH 4 ) 2 HPO 4 , and CMC. The composition and microstructure of the composite and the lattice parameters and particle size of the hydroxyapatite are determined using x-ray diffraction, chemical analysis, IR spectroscopy, scanning and transmission electron microscopy techniques, electron diffraction, and x-ray microanalysis. The hydroxyapatite nanoparticles are shown to form agglomerates about 200 nm in size. The interaction between the nanoparticles and CMC macromolecules leads to the formation of a pore structure potentially attractive for biomedical applications.

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