摘要
以硝酸镁为原料,柠檬酸为络合剂,采用自蔓延溶胶凝胶法制备纳米氧化镁.利用红外光谱分析了干凝胶的结构.将该法制得的柠檬酸镁与溶胶凝胶法制得的前驱体的TG曲线进行比较研究,证明了自蔓延燃烧的发生,而硝酸根在自蔓延燃烧中作为氧化剂.对样品进行TEM测试,发现有自蔓延燃烧过程的产物颗粒小、分布均匀和晶粒形状明显.XRD测试结果显示其平均粒径为8.9nm,BET测定比表面为26.34m2/g.该文还讨论了发泡过程抑制粉体团聚的机理.
Nanometer MgO were prepared by sol-gel auto combustion techniques using magnesium nitrate as raw material and citric acid as chelating agent. IR spectra of dried gels were examined to investigate the structural of precursors. By studying on the different TG curves of magnesium citrate gel, which prepared by different methods, we found that combustion process occurred and the nitrate ions acted as oxidant in combustion process. TEM photographs of synthesis powders by sol-gel auto-combustion showed that the crystallites were uniform. XRD curves of this sample showed that the particle sizes are 8.9 nm. The BET curves showed that the specific surface of the sample is 26.34 m^2/g. And mechanism of foaming process in restraining agglomeration were discussed.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第2期52-57,共6页
Journal of East China Normal University(Natural Science)
基金
上海市科委纳米专项基金(0452nm026)
