Small angle X-ray scattering (SAXS) with synchrotron radiation as X-ray source has been used to study the structure of silica xerogels prepared by sol-gel process. Both the agreement of SAXS profiles with and the devi...Small angle X-ray scattering (SAXS) with synchrotron radiation as X-ray source has been used to study the structure of silica xerogels prepared by sol-gel process. Both the agreement of SAXS profiles with and the deviation from Porod’s law and Debye’s theory have been found, showing that there are differences between the structures of these xerogels. The specific surfaces of the samples whose SAXS profiles agreed with Porod’s law and Debye’s theory have been determined by analyzing SAXS data according to the methods of Porod and Debye, respectively, and the results of both methods used were found to be similar. We have proposed the corresponding Porod and Debye analysis methods to determine the specific surfaces of samples whose SAXS profiles do not agree with Porod’s law and Debye’s theory, i.e. the negative or positive deviation. The results of both methods used here were also found to be close to each other. The specific surfaces fell between approximately 80-150 m2/cm3 for the samples prepared展开更多
本研究利用改进的溶胶-凝胶工艺合成了介孔硅基干凝胶。通过差热-热重(DTA-TG)、X-射线衍射(XRD)、红外光谱(FTIR)和N2等温吸附-脱附测试分析,以及扫描电镜(SEM)、透射电镜(TEM)观察,表征了硅基干凝胶的热效应、相态、结构、形貌特征,...本研究利用改进的溶胶-凝胶工艺合成了介孔硅基干凝胶。通过差热-热重(DTA-TG)、X-射线衍射(XRD)、红外光谱(FTIR)和N2等温吸附-脱附测试分析,以及扫描电镜(SEM)、透射电镜(TEM)观察,表征了硅基干凝胶的热效应、相态、结构、形貌特征,并对合成的硅基干凝胶进行了体外降解与细胞培养实验研究。测试结果表明:合成的硅基干凝胶为平均孔径3nm左右、最大比表面积901m2·g-1的介孔结构。体外模拟体液(Simulated body fluid,SBF)降解结果显示,低温处理的材料在42d内完全降解,直线拟合符合一级反应动力学方程。通过添加钙磷成分或高温煅烧处理可以调控干凝胶的降解速率,使硅基干凝胶的降解呈现直线式匀速降解的特征。体外细胞培养表明:硅基干凝胶可促进C2C12细胞(C3H小鼠肌原细胞)的分化和繁殖,证明材料的生物相容性良好。展开更多
文摘Small angle X-ray scattering (SAXS) with synchrotron radiation as X-ray source has been used to study the structure of silica xerogels prepared by sol-gel process. Both the agreement of SAXS profiles with and the deviation from Porod’s law and Debye’s theory have been found, showing that there are differences between the structures of these xerogels. The specific surfaces of the samples whose SAXS profiles agreed with Porod’s law and Debye’s theory have been determined by analyzing SAXS data according to the methods of Porod and Debye, respectively, and the results of both methods used were found to be similar. We have proposed the corresponding Porod and Debye analysis methods to determine the specific surfaces of samples whose SAXS profiles do not agree with Porod’s law and Debye’s theory, i.e. the negative or positive deviation. The results of both methods used here were also found to be close to each other. The specific surfaces fell between approximately 80-150 m2/cm3 for the samples prepared
文摘本研究利用改进的溶胶-凝胶工艺合成了介孔硅基干凝胶。通过差热-热重(DTA-TG)、X-射线衍射(XRD)、红外光谱(FTIR)和N2等温吸附-脱附测试分析,以及扫描电镜(SEM)、透射电镜(TEM)观察,表征了硅基干凝胶的热效应、相态、结构、形貌特征,并对合成的硅基干凝胶进行了体外降解与细胞培养实验研究。测试结果表明:合成的硅基干凝胶为平均孔径3nm左右、最大比表面积901m2·g-1的介孔结构。体外模拟体液(Simulated body fluid,SBF)降解结果显示,低温处理的材料在42d内完全降解,直线拟合符合一级反应动力学方程。通过添加钙磷成分或高温煅烧处理可以调控干凝胶的降解速率,使硅基干凝胶的降解呈现直线式匀速降解的特征。体外细胞培养表明:硅基干凝胶可促进C2C12细胞(C3H小鼠肌原细胞)的分化和繁殖,证明材料的生物相容性良好。
