【摘要】 采用Ca(NO3)2.4H2O和P2O5为主要原料,柠檬酸为螯合剂,利用溶胶-凝胶法合成了纳米羟基磷灰石粉体.通过DSC,XRD和SEM等手段,分析了纳米HA粉体的形成历程,系统地研究了柠檬酸对粉体形成过程、产物杂质相及粉体粒度的影响,并对其影响机理进行了初步探讨.结果表明:柠檬酸的加入提高了胶体的稳定性,通过螯合作用改变了HA的形成历程.与不加柠檬酸的前驱体所制得的粉体相比,加柠檬酸后所得的HA粉体中杂质相CaO的含量明显降低.同时,柠檬酸的加入有效地抑制了粉体团聚,最终合成的粉体粒度小、颗粒均匀且具有良好的分散性.更多还原

【Abstract】 The powdered nano-hydroxyapatite(HA) powders was synthesized by sol-gel method with Ca(NO3)2·4H2O and P2O5 as main starting materials and citric acid(CA) as chelating agent.With the influencing mechanism discussed,the influence of CA on the formation process of HA nanopowder and its phase purity and particle size was investigated via DSC,XRD,and SEM.The results showed that CA adding improves the gel’s stability and the HA formation process is changed by chelation.The contents of CaO phase in HA nanopowder obtained after CA adding are reduced obviously in comparison with the powder prepared without CA added in precursors.Moreover,CA adding can suppress the agglomeration of powder particles thus making the powder particles of synthesized nano-HA finer and more even with high dispersibility.更多还原