Adsorption on and Surface Chemistry of Hydroxyapatite by Zahid Amjad (auth.), Dwarika N. Misra (eds.)

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 also be one of many significant minerals in advertisement phosphate ores. The adsorption features and floor chemistry of hydroxyapatite are vital in figuring out the expansion, dissolution and adhesion mechanisms of bone and teeth tissues and in elucidating the criteria in mineral beneficiation reminiscent of floation and flocculation. This quantity primarily records the lawsuits of the symposium at the related subject held on the American Chemical Society assembly in Kansas urban, MO, September 12-17, 1982. It incorporates a few papers which have been now not provided on the symposium yet doesn't include the complete software. This quantity presents, on a constrained scale, a multidisciplinary assessment of present paintings within the box of adsorptive habit and floor chemistry of hydroxyapatite and contains yes evaluate articles. There are papers every one on adsorption, adsorption and its results on crystal progress or dissolution kinetics, results of electrochemical parameters on solubility and adsorption, and more recent actual tools (exoemission and high-resolution NMR) of studying hydroxyapatite floor. there's one paper every one on constitution modelling of apatite floor according to octacalcium phosphate interface and on biodegradation of sintered hydroxyapatite.

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In doing so, OCP would be the principal source for many of the interfacial, colloidal , chemical, and physical properties of the product OHAp. e. after nucleation has occurred), OCP could play important roles by acting as a precursor that then hydrolyzes into an impure, defective OHAp. The hydrolysis can occur either while the crystals are growing or after they are formed. The impurities and defects incorporated may affect the level of electrical imbalance within the crystallites, which in turn could have considerable influence on the Galvan!

H. D thesis, Iowa State University, (1972). 19. F. z. Saleeb and P. L. de Bruyn, J. Electroanal. Chem. 37:99 (1972). 20. Y. Avnimelech, E. c. Moreno and W. E. Brown, J. Res. Nat. Bur. Stand. 77A:149 (1973). 21. A. N. Smith, A. M. Posner and J. P. Quirk, J. Colloid Interface Science 54:176(1976). 22. M. s. Wu, W. I. Higuchi, J. L. Fox and M. Friedman, J. Dent. Res. 55:496 (1976). 23. w. E. Brown, T. M. Gregory and L. C. Chow, Caries Res. 11(Suppl. 1) :118 (1977). 24. H. McDowell, T. M. Gregory, and W.

The hydrolysis of OCP to OHAp is an irreversible, topotactic process, and almost Table 1. The Ca/P Ratio and Water Content as Function of Number of OHAp Unit Cells Per Unit Cell of OCP No. 24 ROLES OF OCP IN SURFACE CHEMISTRY OF APATITES 25 certainly does not produce a defect-free OHAp. The nature and extent of these defects in the apatitic layers and interlayering with OCP are likely to have considerable influence on the chemical and surface properties of these products. In the following we describe some natural and synthetic materials Which may be interlayered and partially hydrolyzed products that can be described on the basis of the principles given above.

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