纳米SiO2的制备及性能研究

Synthesis and characterization of Nanoscale-SiO2

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600℃时,经过烧结晶化,可制得纳米二氧化硅,其平均粒径20nm,外观形状呈球形,且热稳定性良好.

Abstract: Nanoscale silica were prepared by the Sol-Gel method with CH3CH2OH and Si(OC2H5)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-SiO2 the average diameter is about 20nm and which have acceptable thermal stability were obtained with 600℃ sintering.