A physicochemical property of hydroxyapatite (HAP) [Ca10(OH)2(PO4)6] surface was studied and parameters of electrical double layer of the hydroxyapatite/NaCl solution system were described. The study sample of hydroxyapatite was synthesized. The structure of the hydroxyapatite was confirmed using X-ray diffraction (XRD), its particle size by PCS (photon correlation spectroscopy) AFM and SCM microscope and its surface properties by means of adsorption-desorption of nitrogen (ASAP), Raman spectra,. Then the point of zero charge and the isoelectirc point were measured.
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