丙酰胺为沉淀剂水热合成羟基磷灰石纤维

摘要

采用四水硝酸钙和磷酸氢二铵的混合物为前驱体,以丙酰胺(PA)为沉淀剂来控制溶液的过饱和度,经水热均相法处理成功制备了高结晶度、形貌均一、分散性良好的纤维状羟基磷灰石(HA)粉体.通过X射线衍射(XRD)、傅里叶红外光谱(FT-IR)、扫描电镜(SEM)和透射电镜(TEM)对所制备的HA进行了表征,研究了初始pH值和前驱体浓度对HA形貌、组成、结晶度及生长习性的影响.结果表明:初始pH值较低时有利于纤维状HA粉体的形成,前驱体浓度较低时则能促进纤维的宽化；但是初始pH值和前驱体浓度对产物的晶体结构、组成及结晶度影响不大.%Fibrous hydroxyapatite (HA) powder was successfully synthesized through hydrothermal method. Calcium nitrate tetrahydrate and diammonium hydrogen phosphate were added as precursors and propionamide (PA) as precipitant was used to control the degree of supersaturation of the reaction solution. XRD, FTIR, SEM and TEM were used to characterize the product. The synthesized HA powder was found to possess high crystallinity and regular morphology, as well as good dispersion. The effects of starting pH value and the concentration of precursors on the morphology, constitution, crystallinity and the growth characteristics of HA were investigated. The results show that the starting pH and concentration significantly affect the morphology at different extents, but not on the constitution and crystallinity. In fact, low starting pH controls orientation of fibrous HA while low concentration widens HA fibers.