摘要
以正硅酸乙酯为原料,在超声波作用下采用醇盐水解法制备了超微SiO2粉体,并采用XRD、SEM、FT-IR和DTA研究了SiO2样品的物相、微观形貌、基团结构和热稳定性。结果表明,超微SiO2粉体为规则的单分散球形非晶态颗粒、粒度均匀、粒径范围窄。样品中含有大量羟基,可加热脱除。SiO2粉体在1150℃发生晶形转变,1200℃转变完成,生成方石英晶相。通过在制备过程不同阶段取样测试,分析了球形SiO2颗粒的生长机理。
With Si（OC2H5）4 as raw material,ultrafine SiO2 powder was prepared by the alkoxide-hydrolysis method under ultrasonic irradiation.XRD,SEM,FT-IR and DTA were used to characterize the phase,micro-morphology,functional group structure and thermal stability of SiO2 powder.The results indicated that the regular mono-disperse ultrafine spherical SiO2 particles were amorphous with uniform size and narrow size distribution.There existed much hydroxyl in SiO2 powder,which could be eliminated by calcining.The crystal form began to transform to cristobalite at 1150℃,and transformation was completed at 1200℃.The growth mechanism of SiO2 particle was also discussed by observing the morphologies of samples at different stages of the preparation process.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2010年第12期3296-3301,共6页
CIESC Journal
基金
国家重点基础研究发展计划项目(2007CB613603)~~
关键词
单分散球形SiO颗粒
非晶态
晶形转变
生长机理
mono-disperse spherical SiO2 particles amorphous crystal transformation growth mechanism
