By Zahid Amjad (auth.), Dwarika N. Misra (eds.)
Hydroxyapatite is the structural prototype of the most inorganic constituent of bone and tooth and, including fluorapatite, is usually one of many imperative minerals in advertisement phosphate ores. The adsorption features and floor chemistry of hydroxyapatite are very important in figuring out the expansion, dissolution and adhesion mechanisms of bone and teeth tissues and in elucidating the standards in mineral beneficiation reminiscent of floation and flocculation. This quantity basically records the complaints of the symposium at the similar subject held on the American Chemical Society assembly in Kansas urban, MO, September 12-17, 1982. It features a few papers that have been now not provided on the symposium yet doesn't contain the full application. This quantity presents, on a restricted scale, a multidisciplinary review of present paintings within the box of adsorptive habit and floor chemistry of hydroxyapatite and contains yes evaluation articles. There are papers every one on adsorption, adsorption and its results on crystal development or dissolution kinetics, results of electrochemical parameters on solubility and adsorption, and more recent actual tools (exoemission and high-resolution NMR) of reading hydroxyapatite floor. there's one paper each one on constitution modelling of apatite floor in accordance with octacalcium phosphate interface and on biodegradation of sintered hydroxyapatite.
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Additional resources for Adsorption on and Surface Chemistry of Hydroxyapatite
Although the authors explained their observations in terms of the rearrangement of adsorbed polymer the interaction of calcium ions with the polymer cannot be ruled out. An excess of calcium ions is expected in the interfacial region if phosphate ions are released into the bulk solution. Only a few studies have been carried out to quantitatively determine the parameters of adsorption of surfactant and macromolecular ions on apatites. A summary of the results is given in Table 5 for both hydroxyapatite and fluorapatite.
ROLES OF OCP IN SURFACE CHEMISTRY OF APATITES Fig. 4. 23 (Continued). OHAp and may hydrolyze spontaneously. In Figure 4a is depicted a cross section of a ribbon or platelet of OCP one unit cell thick and five unit cells wide projected down the c axis. Because this crystallite comprises two half unit cell thicknesses of OCP with their hydrated layers adjacent to the aqueous phase, it would be stable towards further hydrolysis to OHAp. In Figure 4b is shown the crystallite after further growth so that it is now two unit cells thick.
Tissue Int. 31:189 (1980). S. Posner and F. Betts, Synthetic amorphous calcium phosphate and its relation to bone mineral structure, Accounts Chem. Res. 9:273 (1975). J. Dallemagne and C. Fabry, Structure of bone salts, Ciba Foundation Symposium on Bone Structure and Metabolism, 1955, 14-35 (1956). D. Francis and N. C. Webb, Hydroxyapatite formation from hydrated calcium monohydrogen phosphate precursor, Calcif. Tissue Res. 6:335 (1971). Williams and J. D. Sallis, Structural factors influencing the ability of compounds to inhibit hydroxyapatite formation, Ca1cif.