Summary
Adsorption of water was studied gravimetrically at 23°C in an open system at several relative humidities on a variety of apatitic calcium phosphates including enamel, deproteinized enamel, and bone mineral. The amount of adsorbed water increases linearly with the surface areas of the synthetic apatites and does not appear very sensitive to calcium to phosphorus ratio of the apatites. The adsorption results correlate very well up to about two monolayers with a conventionally determined isotherm. Higher uptake of water even by “deproteinized” enamel or bone may be due to the presence of pore structure and incompletely removed organic matter.
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References
Dry ME, Beebe, RA (1960) Adsorption studies on bone mineral and synthetic hydroxyapatite. J Phys Chem 64:1300–1304
Loebenstei, WV (1973) Adsorption of water on tooth components and related materials. J Dent Res 52:271–280
Zahradnik RT, Moreno EC (1975) Structural features of human dental enamel as revealed by isothermal water vapor sorption. Archs Oral Biol 20:317–325
Rootare GM, Craig RG (1978) Vapor phase adsorption of water on hydroxyapatite. J Dent Res 56:1437–1448
Brabson JA, Dunn RL, Epps Jr EZ, Hoffman WM, Jacob KD (1958) Report on phosphorus in fertilizers, photometric determination of total phosphorus. JAOAC 41:517–524
Misra DN, Bowen RL, Wallace MB (1975) Adhesive bonding of various materials to hard tooth tissues XIII. Nickel and copper ions on hydroxyapatite. Role of ion exchange and surface nucleation. J Colloid Interface Sci 51:36–43
Avnimelech Y, Moreno EC, Brown WE (1973) Solubility and surface properties of finely divided hydroxyapatite. J Res Nat Bur Stand 77A:149–155
Wallace BM, Mattamal GJ, Brown WE (1973) Non-stoichiometric hydroxyapatite. IADR Program and Abstract of Papers, No. 109
Termine JD, Eanes ED, Greenfield DJ, and Nyen MU (1973) Hydrazine-deproteinized bone mineral. Calcif Tissue Res 12:73–90
Patel PR, Brown WE (1975) Thermodynamic solubility product of human tooth enamel powdered sample. J Dent Res 54:728–736
Baker FS, Beebe RA, Furedi-Mihofer H, Hlady V (1976) Temperature programmed dehydration of hydroxyapatite. In: Kerker M (ed) Colloid and interface science, III. Academic Press, New York, p 251
Barton SS, Harrison BH (1976) Surface properties of hydroxyapatites, enthalpy of immersion. J Colloid Interface Sci 55:409–414
Misra DN (1972) Dehydroxylation of anatase surface by irradiation and nature of adsorbed water. Nature (Phys Sci) 240:14–15
Morimoto T, Nagao M, Tokuda F (1969) The relation between amounts of chemisorbed and physisorbed water on metal oxides. J Phys Chem 73:243–248
McClellan AL, Harnsberger HF (1967) Cross-sectional areas of molecules adsorbed on solid surfaces. J Colloid Interface Sci 23:577–599
Brunauer S, Emmett PH, Teller E (1938) Adsorption of gases in multimolecular layers. J Am Chem Soc 60:309–319
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Misra, D.N. Water on apatites. Calcif Tissue Int 38, 333–338 (1986). https://doi.org/10.1007/BF02555746
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DOI: https://doi.org/10.1007/BF02555746