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• W2023876744 abstract "As part of a larger project concerning the sorption capacities of carbonate fluoroapatites, the physical and surface properties of the synthetic carbonate fluoroapatite and mineral francolite retained for this work have been carefully examined. The average particle size of the powdered samples, determined by laser granulometry, is around 30 μm. Their specific surface areas, measured according to the N2 BET method, are 8.8±0.1 and 13.9±0.1 m2·g−1, respectively, for the synthetic and the mineral compound. The solubility of both solids has been studied under undersaturation initial conditions. The synthetic compound has a solubility product of 10−103±2, but the mineral francolite, which is highly substituted and poorly crystalline, is more soluble and dissolves incongruently. The amphoteric properties of the hydrous carbonate fluoroapatites surfaces have also been investigated through zeta-potential measurements and potentiometric titrations in KNO3 medium at 25°C. The experimental data have been interpreted using the computer program FITEQL 3.2, applying either the nonelectrostatic or the constant capacitance model. For both solids, the values of the surface acidity constants determined with the two models are very close, suggesting a weak contribution of the electrostatic interactions. Moreover, the more acidic surface of the synthetic compound compared to that of the mineral one is assigned to the differences in crystallinity and chemical composition between the two solids." @default.
• W2023876744 created "2016-06-24" @default.
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• W2023876744 date "2002-05-01" @default.
• W2023876744 modified "2023-09-23" @default.
• W2023876744 title "Surface Characterization of Synthetic and Mineral Carbonate Fluoroapatites" @default.
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• W2023876744 doi "https://doi.org/10.1006/jcis.2002.8255" @default.
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