Preparation and Thermodynamic Study of Self-Dispersal Nano-AlOOH
Self-dispersal nano-AlOOH crystal powder was prepared via sol-hydrothermal crystallization and charging method,using aluminum salt and ammonium as raw materials.TEM,XRD and UV-vis absorption spectroscopy were used to study effects of the hydrothermal temperature and hydrothermal time on precursors crystallization and charging,the products dispersion property and mean particle size.Thermodynamic and dynamic analysis on the preparation process was carried out.Results and analysis suggested that the influence of hydrothermal temperature on products dispersion property was larger than that of hydrothermal time.Modification and control of the hydrothermal conditions could make AlOOH crystal grow along the C-axis and form needle-like particle with lowered surface energy and improved dispersion property.Thermodynamic analysis suggested that the phase transition from Al2O3·nH2O into crystalline AlOOH could spontaneously occur at a temperature within the range of 100℃~ 150℃.In the preparation of AlOOH crystal powder via the hydrothermal crystallization and charging composite dispersion method,the reaction condition was mild with a strong thermodynamic driving force and small activation energy of 24.11 kJ/mol.
hydrothermal crystallization nano-AlOOH thermodynamics self-dispersal
LIAO Haida Zhang Weiping Sun Xiaoming Meng JiaQing Wei Yan Tang Jun
College of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530006,China
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
100-105
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）