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Studies on calcium deficient apatites structure by means of MAS-NMR spectroscopy

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Abstract

The development of synthetic apatites that replicate the features and properties of the contained in natural tissues will help to diminish the misfit between artificial implants and natural hostesses but the structure of these compounds is still under discussion. The variability in Ca/P ratio of calcium deficient apatites has been explained through different models: surface adsorption, lattice substitution and intercrystalline mixtures of hydroxyapatite and octacalcium phosphate. This work investigates which of the models mentioned suits better in a range of samples. Hydroxyapatites obtained by precipitation, by hydrolysis of dicalcium phosphate and calcined samples with Ca/P ratio between 1.50 and 1.77 and specific surface area between 7 and 108 m2/g have been analysed. OCP and surface adsorption models suit better for great SSA particles and low Ca/P ratio while for smaller SSA particles the lattice substitution model is more accurate. SSA also plays the main role when the capacity to absorb substances is studied though their chemistry can not be explained solely in terms of surface reactivity.

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  1. ICTP-CSIC, C/Juan de la Cierva 3, 28006, Madrid, Spain

    L. M. Rodríguez-Lorenzo

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  1. L. M. Rodríguez-Lorenzo
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Rodríguez-Lorenzo, L.M. Studies on calcium deficient apatites structure by means of MAS-NMR spectroscopy. J Mater Sci: Mater Med 16, 393–398 (2005). https://doi.org/10.1007/s10856-005-6977-4

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  • DOI: https://doi.org/10.1007/s10856-005-6977-4

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