イオン交換樹脂を含む懸濁水への難溶性無機化合物の溶解(第11報) : リン酸八カルシウム(Ca_8H_2(PO_4)_6・5H_2O)

概要

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The dissolution process of octacalcium phosphate (Ca_8H_2(PO_4)_6-5H_2O, OCP) using a strongly acidic ion exchange resin with a hydrogen form (H-R) suspended in water was examined in detail to confirm the formation of CaHPO_4・2H_2O (DCPD) as an intermediate. The reactivity of OCP, α- or β- tricalcium phosphate (α- or / β-TCP), or tetracalcium phosphate (Ca_4(PO_4)_2O, TetCP), with Ca(H_2PO_4)_2 solution to form DCPD was com-pared using calorimetry and chemical analysis. The reactivity increased in the order of TetCP ≒ α-TCP≫OCP ≧ β-TCP. The structure of OCP consists of "apatite layer" and "hydrated layer." The "apatite layer" of OCP was examined by comparing the reactivity of DCPD + hydroxyapatite (Hap) and DCPD + β-TCP with H-R where Hap and β-TCP imitated the "apatite layer." The results suggested that the "apatite layer" in OCP would be similar to /7-TCP rather than Hap in terms of the reactivity.
社団法人日本セラミックス協会の論文
2004-09-01