Abstract
THE crystal and solution chemistry of apatites has been studied intensively by medical, biological and earth scientists but studies of the electrochemistry of apatite surfaces have not been extensive. The few studies of the surface charge characteristics of hydroxyapatite [Ca10(OH)2(PO4)6] and fluorapatite [Ca10F2(PO4)6] show that H+ and OH− are potential determining ions, but estimates of the pH at the point of zero charge (PZC) have varied widely from 4.3 to 7.6 for hydroxyapatite1–5 and from 4 to >12 for fluorapatite6–8.
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BELL, L., POSNER, A. & QUIRK, J. Surface Charge Characteristics of Hydroxyapatite and Fluorapatite. Nature 239, 515–517 (1972). https://doi.org/10.1038/239515a0
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DOI: https://doi.org/10.1038/239515a0
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