This paper is an extension of previous work devoted to the characterization of platelet-like hydroxyapatite (HA) nanoparticles constituted by a crystalline core coated by an amorphous surface layer 1 to 2 nm thick (L. Bertinetti et al. J. Phys. Chem C. 2007, 111, 4027–4035). By increasing the preparation temperature, the platelet morphology was retained but HA nanoparticles exhibited a higher degree of crystallinity (evaluated by X-ray diffractometry). High resolution transmission electron microscopy revealed that in this case the crystalline order was extended up to the particles surfaces, that were of the (010), (100) and (001) types. IR spectroscopy was used to investigate the surface hydration of both materials, in terms of adsorbed H2O molecules and surface hydroxy groups, as well as the Lewis acidity of surface cations, by removing water and adsorbing CO. For both features, strong similarities between amorphous and crystalline surfaces were found.

Surface Hydration and Cationic Sites of Nanohydroxyapatites with Amorphous or Crystalline Surfaces: A Comparative Study

SAKHNO, YURIY;BERTINETTI, Luca;MARTRA, Gianmario
2010-01-01

Abstract

This paper is an extension of previous work devoted to the characterization of platelet-like hydroxyapatite (HA) nanoparticles constituted by a crystalline core coated by an amorphous surface layer 1 to 2 nm thick (L. Bertinetti et al. J. Phys. Chem C. 2007, 111, 4027–4035). By increasing the preparation temperature, the platelet morphology was retained but HA nanoparticles exhibited a higher degree of crystallinity (evaluated by X-ray diffractometry). High resolution transmission electron microscopy revealed that in this case the crystalline order was extended up to the particles surfaces, that were of the (010), (100) and (001) types. IR spectroscopy was used to investigate the surface hydration of both materials, in terms of adsorbed H2O molecules and surface hydroxy groups, as well as the Lewis acidity of surface cations, by removing water and adsorbing CO. For both features, strong similarities between amorphous and crystalline surfaces were found.
2010
114
16640
16648
nanohydroxyapatites; surface structure; adsorbed water; surface cations; HR-TEM; IR spectroscopy of adsorbed molecules.
Y.Sakhno; L. Bertinetti; M. Iafisco; N. Roveri; A. Tampieri; G. Martra
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/74193
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