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• W2024250079 abstract "The kinetics of dehydration of amorphous calcium phosphate (ACP) has been studied by the temperature programmed desorption technique (TPD) of Cvetanović and Amenomiya. Each water desorption spectrum for ACP exhibited a single, but fairly narrow, peak. Peak temperatures varied from 65–100°C for sample heating rates ranging from 3–32°C/min. Narrowness of the desorption spectra lends some support to its earlier characterization as an agglomerate of hydrated Ca2+ and PO43− ions. In contrast, a water desorption spectrum for crystalline hydroxyapatite (HA) showed several broad overlapping peaks with maxima at 120, 250, and 305°C which is typical of a heterogeneous surface. The desorption spectra for ACP when compared to those for HA indicate very different states of bound water in these two substances. Plotted kinetic data for ACP revealed two linear segments with different activation energies, namely 10.5 and 20.0 kcal/mole. A plausible explanation for this finding is that there are two types of bound water in ACP: (i) loosely held water and (ii) tightly bound hydrate water held inside the amorphous particles. The possibility that hydrate water loss is involved in the rate determining step in the in vitro conversion of ACP to HA is tentatively suggested." @default.
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• W2024250079 date "1974-05-01" @default.
• W2024250079 modified "2023-10-17" @default.
• W2024250079 title "Temperature programmed dehydration of amorphous calcium phosphate" @default.
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• W2024250079 doi "https://doi.org/10.1016/0021-9797(74)90280-x" @default.
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