The present paper details the surface modification of pure calcium hydroxyl and fluoroapatite (CaHAp and CaFAp) by grafting β-[P₂W₁₈O₆₂]⁶⁻ polyoxometalate (P₂W₁₈) with 1:1 and 1:5 mass ratio. The specific surface area (SSA) for pure materials, the X-ray diffraction pattern, the FTIR and the ³¹P MAS-NMR spectroscopy were used to compare the surface reactivity of CaHAp and CaFAp. These techniques show that the surface of hydroxyapatite is more reactive than that of the fluoroapatite. The reactivity is mainly related to the presence of ≡POH active sites, which are generated by the protonated form of phosphate group (HPO₄²⁻).

本文详细介绍了通过以1：1和1：5的质量比接枝β-[P ₂ W ₁₈ O ₆₂ ] ^6-多金属氧酸盐（P ₂ W ₁₈）对纯羟基钙和氟磷灰石（CaHAp和CaFAp）的表面改性。使用纯材料的比表面积（SSA），X射线衍射图，FTIR和³¹ P MAS-NMR光谱比较CaHAp和CaFAp的表面反应性。这些技术表明，羟基磷灰石的表面比氟磷灰石的表面更具反应性。反应性主要与≡POH活性位点的存在有关，, POH活性位点是由磷酸基团（HPO ₄ ^2-）。