纳米SiO_2的制备及性能研究  

Synthesis and characterization of Nanoscale-SiO_2

作　　者：李茂琼[1] 项金钟[1] 胡永茂[1] 方静华[1] 陈光学[1] 张桂琴[1] 吴兴惠[1] 

机构地区：[1]云南大学材料科学与工程系,云南昆明650091

出　　处：《云南大学学报（自然科学版）》2002年第6期445-448,共4页Journal of Yunnan University(Natural Sciences Edition)

基　　金：云南省自然科学基金重点项目 (2 0 0 1E0 0 0 3Z)

摘　　要：用溶胶—凝胶法制备了纳米SiO2 ,考察了溶胶的浓度和 pH值对凝胶时间的影响 ,并用FT -IR ,XRD和TEM研究了其在热处理过程中的物相及显微结构 .结果表明 :溶胶浓度和溶胶 pH值对凝胶时间影响较大 .在温度为 6 0 0℃时 ,经过烧结晶化 ,可制得纳米二氧化硅 ,其平均粒径 2 0nm ,外观形状呈球形 ,且热稳定性良好 .Nanoscale silica were prepared by the Sol Gel method with CH 3CH 2OH and Si(OC 2H 5) 4.Under different heat-treatment temperatures, the phase and microstructure of the nanoscale silica were studied with FT-IR,XRD and TEM.It is resulted that sol concentration and its pH value are the important factor which determine the gelation time.Nanoscale SiO 2 the average diameter is about 20?nm and which have acceptable thermal stability were obtained with 600℃ sintering.

关 键 词：制备 溶胶-凝胶法 纳米SIO2 正硅酸乙酯 纳米二氧化硅 凝胶时间 pH值 

分 类 号：TB383[一般工业技术—材料科学与工程]