Affiliation:
1. Department of Dental Materials, School of Dentistry, University of Michigan, Ann Arbor, Michigan 48109, USA
Abstract
Water vapor adsorption isotherms were determined gravimetrically on three hydroxyapatite samples differing in preparation and with surface areas of 70.4, 22.5, and 3.0 M 2/gm, respectively. Heats of adsorption for the first layer of water were found to be 13.3, 13.2, and 13.9 kcallmole on these hydroxyapatites. From repeated thermal desorption and adsorption cycles of water, stepwise adsorption was observed which diminished with each outgassing cycle until it disappeared after the fourth cycle. Cross-sectional area of adsorbed water molecule on hydroxyapatite surface was estimated at 11.5 Å2. Standard free energies, isosteric heats, changes in enthalpy, and entropy of adsorption of water on HAP samples outgassed at 300 C were determined.
Reference38 articles.
1. Beebe, R.A.: Gas Adsorption Studies on Bone Mineral, in Phillips, R. W. and Ryge, Gunnar (eds), Adhesive Restorative Dental Materials. Spencer , Indiana, Owen Litho Service, 1961 , pp 75-84.
2. A COMPARISON OF THE MEASUREMENT OF HEATS OF ADSORPTION BY CALORIMETRIC AND CHROMATOGRAPHIC METHODS ON THE SYSTEM NITROGEN—BONE MINERAL
3. ADSORPTION STUDIES ON BONE MINERAL AND SYNTHETIC HYDROXYAPATITE1,2
4. Adsorption Studies on Bone Mineral
5. Gas Adsorption and Surface Structure of Bone Mineral*
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