By Zahid Amjad (auth.), Dwarika N. Misra (eds.)
Hydroxyapatite is the structural prototype of the most inorganic constituent of bone and enamel and, including fluorapatite, can be one of many imperative minerals in advertisement phosphate ores. The adsorption features and floor chemistry of hydroxyapatite are vital in realizing the expansion, dissolution and adhesion mechanisms of bone and the teeth tissues and in elucidating the criteria in mineral beneficiation akin to floation and flocculation. This quantity primarily records the lawsuits 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 offered on the symposium yet doesn't include the whole application. This quantity offers, on a constrained scale, a multidisciplinary evaluation of present paintings within the box of adsorptive habit and floor chemistry of hydroxyapatite and comprises yes overview articles. There are papers each one on adsorption, adsorption and its results on crystal development or dissolution kinetics, results of electrochemical parameters on solubility and adsorption, and more moderen actual tools (exoemission and high-resolution NMR) of analyzing hydroxyapatite floor. there's one paper every one on constitution modelling of apatite floor in line with octacalcium phosphate interface and on biodegradation of sintered hydroxyapatite.
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Additional info for Adsorption on and Surface Chemistry of Hydroxyapatite
M. D. Francis and N. C. Webb, Calcif. Tissue Res. 6 : 335 ( 1971) • 34. A. L. Boskey and A. s. Posner, J. Phys. Chem •• 80:40(1976). 35. w. G. M. van den Hock, T. P. Feenstra and P. L. de Bruyn, J. Phys. Chemistry. 84:3312(1980). 36. z. Amjad, P. G. Koutsoukos and G. H. Nancollas, J. , 82:394 (1981). 37. s. Chander, c. c. Chiao and D. W. Fuerstenau, J. Dental Res. 61(2):403 (1982). 38. s. Chander and D. W. Fuerstenau, J. Colloid Interface Sci. 70:506 (1979). 39. G. A. Parks, Chem. Reviews 65:177 (1965).
E) Binding through Hydrogen Bonds. The adsorbing species may hydrogen bond to the phosphate or hydroxyl (or fluoride) groups of the apatite lattice. (f) Formation of Multilayers through Surface Reaction. Multilayers are formed particularly when plaque forming proteins interact with hydroxyapatite surface. 46 S. CHANDER AND D. W. FUERSTENAU Even though significant progress has been made in recent years towards understanding the mechanism of adsorption of organic species on apatites, more quantitative investigations are needed to fully delineate the interfacial reaction mechanisms.
When studies are made by precipitation from supersaturated solutions, equilibrium is not achieved unless long times or elevated temperatures are used. Several precursor phases have been identified by investigators studying the precipitation of HA. These phases include amorphous calcium phosphate (ACP) (27), tricalcium phosphate (TCP) (28-29), octacalcium phosphate (OCP) (30-32), and dicalcium phosphate dihydrate (DCPD) (33). Recent studies show that hydroxyapatite can be directly precipitated from solutions of low supersaturation (32,34).