摘要
制备了20Na2O·20CaO·xSiO2·(60-x)P2O5体系缓释性磷酸盐玻璃,用X射线衍射(XRD)和傅立叶变换红外光谱(FTIR)对玻璃结构进行了表征,并测定了该玻璃体系样品的密度、热膨胀系数等基本性质,用溶解速率法(DR)和离子色谱研究了该缓释性玻璃体系的溶解过程。研究发现,SiO2的引入破坏了磷酸盐玻璃网络结构中的P=O和非桥氧键,当取代量x大于5 mol%时体系密度下降,溶解速率显著增大,低取代量的样品在溶解过程中释放出的PO43-浓度随时间增长逐渐呈现出线性关系。
The 20Na2O·20CaO·xSiO2·(60-x)P2O5 sustained-release phosphate glass system was prepared in this article,which were characterized using X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FTIR). The density, thermal expansion coefficient of the glass system, as the basic nature, were determined. Besides, the course of dissolution of the sustained-release glass system were studied by using the dissolution rate(DR) method and ion chromatography. It was found that the introduction of SiO2 destroyed the network structure of phosphate glass, especially for the P=O and the non-bridging oxygen. When the substitution amount x is greater than 5 mol%, the density of the system was decreased, while the rate of dissolution increased significantly. During the dissolution and release of the sample with low-dose, the concentration of PO43- show a linear relationship with time increasing gradually.
出处
《中国陶瓷》
CAS
CSCD
北大核心
2014年第9期10-15,共6页
China Ceramics
关键词
缓释性
密度
溶解速率
线性
Slow-releasing property
Density
Dissolution rate
Linearity
