Pechini溶胶-凝胶法制备超细二氧化硅  

Synthesis of ultrafine silica powders by Pechini sol-gel method

作　　者：伍媛婷[1] 王秀峰[1] 仝小飞 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021 [2]彩虹集团公司

出　　处：《无机盐工业》2011年第6期17-19,共3页Inorganic Chemicals Industry

基　　金：陕西省教育厅科研计划项目(09JK362);陕西省自然科学基金项目(2010JQ6006;2009JM6008)

摘　　要：以乙醇和去离子水为溶剂,以正硅酸乙酯为原料,柠檬酸为络合剂,采用Pechini溶胶-凝胶法制备了超细二氧化硅粉体,采用热分析(TG-DTG、DSC)、X射线衍射(XRD)分析、傅里叶红外光谱(FT-IR)分析、场发射扫描电镜(FESEM)分析等对二氧化硅粉体制备过程中的物理化学变化进行了研究。结果表明:1 000℃以下煅烧所得二氧化硅粉体均为非晶相,pH影响了煅烧过程中有机物的降解燃烧;煅烧温度为500℃时,所得二氧化硅纳米粉体的粒径约为10 nm;煅烧温度升高至600℃时,粉体团聚严重,晶粒尺寸增大至20 nm。Using ethanol and deionized water as solvent,tetraethyl orthosilicate as raw material,and citric acid as complexing agent, ultrafine silica （ SiO2 ） powders were prepared by Pechini sol - gel method. The means of TG - DTG - DSC, XRD, FT - IR, and FESEM etc. were used to analyze the physical and chemical changes during the preparation process. Re- sults showed that the prepared SiO2 powders were amorphous phase when calcined below 1 000 ℃ ;the pH had a great influ- ence on degradation combustion of organics;the SiO2 powders with an average particle size of about 10 nm were synthesized when calcined at 500 ℃ ;while calcined at 600 ℃ ,the SiO2 powders seriously conglomerated and the average size increased to 20 nm.

关 键 词：超细二氧化硅 Pechini溶胶-凝胶法 柠檬酸 

分 类 号：TQ127.2[化学工程—无机化工]