膜科学与技术

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Stability of ZrO2 Sol and Phase-chemical Structure Analysis of Sol-gel Material Transition

Authors： YANG Jing* , LI Linyu, LI Bo, GUO Yingming, MA Jiaying

Units： School of Urban Planning and Municipal Engineering, Xi’an Polytechnic University

KeyWords： Sol-gel process; ZrO2 sol; Gel material; Sol stability; Viscous activation Gibbs free energy

ClassificationCode：O484

year,volume(issue):pagination： 2018,38(4):23-26

Abstract：

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℃.

Funds：

国家自然科学基金(21573171)和陕西省重点研发计划(2017GY-121)

AuthorIntro：

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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