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纳米SiO₂制备时相转变研究

Study on phase transition of nano-SiO₂ during preparation

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【Author】 DING Yan-hong1,2,TANG Yuan-hong3,YANG Yang1(1.College of Material Science and Engineering,Centerl South University,Changsha 410083,China; 2.College of Mechanical Engineering,Hunan University of Technology,Changsha 410083,Chian; 3.College of Material Science and Engineering,Hunan University,Changsha 410083,China)

【机构】中南大学材料与工程学院；湖南工业大学机械工程学院；湖南大学材料与工程学院；

【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。更多还原

【Abstract】 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.更多还原