Título:
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Dry mechanosynthesis of nanocrystalline calcium deficient hydroxyapatite: Structural characterisation
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Autor/a:
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Mochales Palau, Carolina; Wilson, R. M.; Dowker, S.E.P.; Ginebra Molins, Maria Pau
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. BBT - Biomaterials, Biomecànica i Enginyeria de Teixits |
Abstract:
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Dry mechanosynthesis is an efficient technique to synthesise nanocrystalline calcium deficient hydroxyapatites
(CDHA). The mechanisms underlying a mechanochemical reaction are different from those
triggering a dissolution mediated process, and this can have an effect on the structural features of the
product. In this work, a nanocrystalline CDHA with Ca/P molar ratio of 1.5 obtained by means of dry
mechanosynthesis of calcium oxide and dicalcium phosphate dihydrate was analysed. Spectroscopic
techniques confirmed the presence of hydrogen phosphate (HPO4
2−) groups and a non-apatitic environment
of the phosphate ions and disordered hydroxyl groups due to the nanometric size of the crystals.
Lattice parameters of mechanosynthesised CDHA showed a small increase in the a lattice parameter
(9.4418(20)A˚ ) and a small decrease in the c lattice parameter (6.8745(17)A˚ ), in agreement with the values
reported in the literature for precipitated CDHAs. A prolonged milling resulted in an increase of the
crystallinity of the CDHA and its partial decomposition into -TCP by the loss of OH− and HPO4
2− groups. |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria dels materials::Metal·lúrgia -Materials science -Vidre -- Anàlisi -Ceràmica -- Anàlisi |
Derechos:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
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Artículo - Versión publicada Artículo |
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