溶胶-凝胶生物活性玻璃的纳米结构分析研究

利用溶胶-凝胶低温合成法制备了CaO-P2O5-SiO2系统生物活性玻璃骨修复及骨组织工程材料.利用SEM、BET及XRD等方法对溶胶-凝胶生物活性玻璃的微观结构及其组成对材料微观结构的影响进行了分析,并同目前已临床应用的45S5生物活性玻璃进行了比较.研究发现由溶胶-凝胶法制备的生物活性玻璃是由纳米级微球构成,其高比表面积是由其纳米微球之间的孔隙所致.这种高比表面积对于提高材料的表面吸附能力及生物矿化功能具有重要作用.根据等大球体最紧密堆积原理建立了溶胶-凝胶生物活性玻璃纳米孔隙尺寸近似计算模型,并对其孔隙结构进行了分析计算.

Nano-Structure Analysis of the Sol-Gel Derived Bioactive Glasses

The new type of amorphous biomaterials in system CaO-P2O5-SiO2 with high bioactivity was synthesized via sol-gel method.The sol-gel derived biomaterials can be applied to bone reparation and bone tissue engineering scaffolds.The effect of the composition of the sol-gel derived bioactive glass on the microstructure of the materials were investigated in detail by using SEM,BET and XRD techniques,compared with 45S5 bioactive glass which has been applied to clinic.It was observed by SEM that the sol-gel bioactive glass is composed of countless nano-sized "beads" which connected one another to form a nano-structure.This structure can result in a great amount of nano-sized micro-pores and a huge special surface area,which enhances the surface adsorption ability and bio-mineralization characteristic of the sol-gel derived biomaterials.According to the most compact stack measure theory of same spheres,a counting model of nano-sized micro-pores of the sol-gel bioactive glass was estabilshed,and also,the micro-pores structure of the sol-gel derived glasses were analyzed.