均相沉淀法合成磷酸八钙纤维  

Synthesis of Octacalcium Phosphate Fibers via Homogeneous Precipitation

作　　者：王小俊[1] 方立明[1] 赵耀明[1] 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2010年第7期107-111,121,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50803019);广东省自然科学基金资助项目(8451064101000727);广州市科技局科技计划项目(2008J1-C101)

摘　　要：采用均相沉淀法制备了磷酸八钙(OCP)纤维,并采用红外光谱、X射线衍射、扫描电镜对产物进行表征,探讨了反应温度及反应物浓度等对产物组成及形貌的影响.实验发现合成条件对OCP形貌及产物组成的影响较大——提高体系反应温度有利于OCP的快速析出和产率的提高,所得产物也更为纤细;尿素浓度过低,所得产物的长短和粗细分布极不均匀;尿素浓度偏高,产物较为粗短,且产物为OCP和羟基磷灰石(HA)的混合磷酸盐;当反应物Ca(NO3)2为0.167mol/L、(NH4)2HPO4为0.1mol/L、(NH2)2CO为0.6～0.7mol/L,体系初始pH值在2.2左右,反应温度为90℃,反应体系中pH值恒定在5.0左右时结束反应,采用均相沉淀法可制得纤细的磷酸八钙纤维.Octacalcium phosphate fibers were synthesized via homogeneous precipitation,and the product was characterized by means of FT-IR,XRD and SEM. Then,the effects of synthesis temperature and reactant concentration on the morphology and composition of the product were discussed,with a significant effect being observed. Experimental results show that high temperature helps to accelerate the precipitation of OCP and obtain fine product with high yield,that too low urea concentration may result in highly inhomogeneous size distribution of OCP,while too high urea concentration may result in large and short product mixture of OCP and hydroxyapatite,and that fine OCP fibers can be synthesized via the homogeneous precipitation at 90℃,with an initial pH value of about 2. 2 and an final pH value of about 5. 0,and with 0. 167 mol/L Ca（ NO3） 2,0. 1 mol/L （ NH4） 2HPO4 and 0. 6 ～ 0. 7 mol/L （ NH2） 2CO as the reactants.

关 键 词：磷酸八钙 纤维 均相沉淀 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]