Tas A C, Aldinger F
School of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA.
J Mater Sci Mater Med. 2005 Feb;16(2):167-74. doi: 10.1007/s10856-005-5919-5.
Poorly crystalline, apatitic calcium phosphate powders have been synthesized by slowly adding a Na- and K-containing reference phosphate solution with a pH value of 7.4 to an aqueous calcium nitrate solution at 37 degrees C. Nano-particulated apatitic powders obtained were shown to contain small amounts of Na and K, which render them more similar in chemical composition to that of the bone mineral. Precipitated and dried powders were found to exhibit self-hardening cement properties when kneaded in a mortar with a sodium citrate- and sodium phosphate-containing starter solution. The same phosphate solution used in powder synthesis was found to be able to partially convert natural, white and translucent marble pieces of calcite (CaCO3) into calcium-deficient hydroxyapatite upon aging the samples in that solution for 3 days at 60 degrees C. Sample characterization was performed by using scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, inductively-coupled plasma atomic emission spectroscopy, and simultaneous thermogravimetry and differential thermal analysis.
通过在37℃下将pH值为7.4的含钠和钾的参考磷酸盐溶液缓慢加入到硝酸钙水溶液中，合成了结晶性差的磷灰石型磷酸钙粉末。所获得的纳米颗粒磷灰石粉末显示含有少量的钠和钾，这使其在化学成分上更类似于骨矿物质。当在研钵中与含柠檬酸钠和磷酸钠的起始溶液捏合时，发现沉淀并干燥的粉末表现出自硬化水泥特性。发现在粉末合成中使用的相同磷酸盐溶液在60℃下将样品在该溶液中老化3天后能够将天然的、白色半透明的方解石大理石块（CaCO₃）部分转化为缺钙羟基磷灰石。通过使用扫描电子显微镜、X射线衍射、傅里叶变换红外光谱、电感耦合等离子体原子发射光谱以及同步热重分析和差示热分析进行样品表征。
