Chemical Diversity of Apatites |
| Journal |
Advances in Science and Technology (Volume 49) |
| Volume |
Materials in Clinical Applications VII |
| Edited by |
P. VINCENZINI and R. GIARDINO |
| Pages |
27-36 |
| DOI |
10.4028/www.scientific.net/AST.49.27 |
| Online since |
October, 2006 |
| Authors |
Christian Rey,
Christèle Combes,
Christophe Drouet,
Hocine Sfihi
|
| Keywords |
Apatite, Biomaterial, Bone, Calcium Phosphate (CaP), Nanocrystal |
| Abstract |
Apatites can accommodate a large number of vacancies and afford multiple ionic
substitutions determining their reactivity and biological properties. Unlike other biominerals they
offer a unique adaptability to various biological functions. The diversity of apatites is essentially
related to their structure and to their mode of formation. Special charge compensation mechanisms
allow molecular insertions and ion substitutions and determine to some extent their solubility
behaviour. Apatite formation at physiological pH involves a structured surface hydrated layer
nourishing the development of apatite domains. This surface layer contains relatively mobile and
exchangeable ions, and is mainly responsible for the surface properties of apatite crystals from a
chemical (dissolution properties, ion exchange ability, ion insertions, molecule adsorption and
insertions) and a physical (surface charge, interfacial energy) point of view. These characteristics
are used by living organisms and can also be exploited in material science. |
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