膜科学与技术

ZrO2溶胶的稳定性及溶胶-凝胶材料转变的物相-化学结构分析

作者：杨靖，李淋钰，李波，郭英明，马嘉莹

单位：西安工程大学城市规划与市政工程学院

关键词：溶胶-凝胶过程；ZrO2溶胶；凝胶材料；溶胶稳定性；粘滞性活化吉布斯自由能

出版年,卷(期):页码： 2018,38(4):23-26

摘要：

以Zr(NO3)4·5H2O为前驱体，采用溶胶-凝胶法制备ZrO2溶胶.通过测定ZrO2溶胶的密度、粘度，计算ZrO2溶胶体系的粘滞性活化吉布斯自由能，采用红外光光谱、粒径分析、X射线衍射（XRD）和扫描电镜（SEM）对ZrO2溶胶及其凝胶材料进行分析表征。结果表明，所形成的ZrO2溶胶粒径小且分布窄，平均粒径为2.89 nm。在25℃陈化的前60d内，ZrO2溶胶的密度、粘度、粒径以及粘滞性活化吉布斯自由能略有增大，表明溶胶体系内部颗粒间有较大的摩擦力，溶胶稳定性和分散性良好。ZrO2溶胶及其凝胶材料中均没有Zr-O键，Zr元素是以无定型ZrOC2O4·2H2O的形式存在，400℃焙烧后出现的是四方相ZrO2晶体。

ZrO2 sol was prepared by sol-gel method using Zr(NO3)4·5H2O as precursor. The Gibbs free energy of ZrO2 sol system was calculated by measuring the density and viscosity of ZrO2 sol. Infrared spectra (IR), particle size analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the properties of ZrO2 sol and its gel material. The results show that the freshly prepared ZrO2 sol has a narrow particle size distribution with an average particle size of 2.89 nm. Within the first 60 days aged at 25℃, the density, viscosity, particle size and viscosity-activated Gibbs free energy of ZrO2 sol slightly increase, indicating that the great friction exists among the particles of the system and ZrO2 sol has good stability and dispersibility. There is no Zr-O bond in the ZrO2 sol and its gel material, and Zr element exists in the form of amorphous ZrOC2O4·2H2O. Tetragonal ZrO2 crystal appears in the sample calcined at 400℃.

通讯联系人：杨靖（1976- ），女，湖北省武汉市人，博士，西安工程大学教授，主要从事膜材料的制备及分离技术的研究. E-mail: jingy76@163.com

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