Paper Titles
Protein Adsorption Properties of Hydrothermally Prepared Hydroxyapatite
p.71
Vibrational Properties of Sodium Substituted β-Tricalcium Phosphate
p.75
Exchange Reactions at Calcium Phosphates Surface and Applications to Biomaterials
p.79
Preparation of Spherical Porous Granules Composed of Rod-Shaped Hydroxyapatite and Evaluation of their Protein Adsorption Properties
p.83
Surface Structure, Hydration and Cationic Sites of Nanohydroxyapatite
p.87
Influence of Two-Step Sintering Variables on Phase Stability of Hydrothermally Prepared HAp Nano Powders
p.91
Internal Diffusion of Micro/Nanoparticles Inside Body
p.95
The Structure and Properties of Electroceramics for Bone Graft Substitution
p.99
Variations in the Compression Strength of Cylindrical Samples Made of Dense Hydroxyapatite
p.103

Surface Structure, Hydration and Cationic Sites of Nanohydroxyapatite

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Abstract:

In this work, we studied the surface/water interaction properties of a pure calcium hydroxyapatite (HA) and their modifications as a consequence of the partial Ca2+/Mg2+ (MHA) substitution by means of IR spectroscopy and microcalorimetry of adsorbed water. IR data indicated that water molecules in direct contact with the surface of HA are coordinated to surface cations and experience H-bond significantly stronger than in liquid water. The heats of adsorption associated to such interactions are very high, being twice-triple the heat of liquefaction of water. Interestingly, water experiences H-bond higher than in its bulk liquid state also in the second layer. Finally the entering in the material of Mg2+ ions was shown to significantly affect the affinity of the material toward water and the properties of its hydration layers.

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Periodical:

Key Engineering Materials (Volumes 361-363)

Pages:

87-90

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.361-363.87

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Online since:

November 2007

Authors:

Luca Bertinetti, Anna Tampieri, Elena Landi, V. Bolis, C. Busco, Gianmario Martra

Keywords:

Hydration, Hydroxyapatite (HAP), Infrared, Microcalorimetry, Surface Structures

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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