【摘要】 为了研究反应时间、温度、钙磷比以及反应体系的pH值对羟基磷灰石结构及形貌的影响,本文采用水热法在醋酸钙和磷酸的混合酸性溶液中制备羟基磷灰石。用扫描电镜(Scann ing e lectron m icroscopy,SEM)、X射线衍射(X-ray d iffraction,XRD)和红外光谱(FT-IR)法,对制备的羟基磷灰石进行了表征和分析。结果表明:生成的羟基磷灰石晶须的长度及长径比随反应时间的延长而增大。温度低于150℃时,得到羟基磷灰石晶须;温度高于180℃,则得到细小羟基磷灰石晶体的聚集产物。当反应物的pH=9时,得到的是缺钙型的羟基磷灰石;当反应物的pH<4时,产物中出现新相磷酸氢钙;当pH=2时,得到纯的磷酸氢钙。更多还原

【Abstract】 To study influences of growth conditions,such as reaction time,temperature and pH of the mixed solutions on the structure and morphology of the hydroxyapatite(HA),the hydrothermal method is used to prepare the hydroxyapatite in the acidic solution consisted of calcium acetate and phosphoric acid.It is characterized as-prepared hydroxyapatites with scanning electron microscopy(SEM),X-ray diffraction(XRD) and FT-IR.Results show that hydroxyapatite whiskers are formed at the low temperature,while hydroxyapatite aggregates are obtained at the elevated temperature;the length and aspect ratio of the hydroxyapatites increases with the reaction time.In the reaction,deficient hydroxyapatites are obtained at pH=9.The calcium hydrophosphate appears around pH<4 and becomes the dominated product at pH=2.更多还原