摘要
以稻壳为原料,采用两步酸性预处理法制备纳米SiO2粉末,利用SEM、HRTEM和EDS等检测手段对纳米SiO2进行表征分析,结果表明,焙烧温度<570℃时,制备试样为原生的非晶态纳米SiO2,随着焙烧温度的升高,出现微晶,SiO2晶化程度越来越大,焙烧温度为1080℃时,非晶态纳米SiO2转化为柱形晶态纳米SiO2,并对其相转变机理作了探讨。
Nano-SiO2 powder has been synthesized with two-step acid pretreatment method from rice husk.The nano-SiO2 is characterized by scanning electron microscope（SEM）,high-resolution transmission electron microscopy（HRTEM） and energy-dispersive X-ray spectrometry（EDX）.Research results demonstrate that the prepared samples are a kind of amorphous nano-SiO2 When the calcination temperature is less than 570℃.As the calcination temperature increasing,SiO2 microcrystals come into being and SiO2 crystallization degree is increasing.The amorphous nano-SiO2 is translated into crystalline nano-SiO2 with column at calcination temperature 1080℃.And the reasons for its phase transition are discussed.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第3期546-549,共4页
Journal of Functional Materials
关键词
纳米SIO2
非晶态
晶态
相变
nano-SiO2
amorphous
crystalline
phase transition
