高球形度、高比表面积SiO_2/TiO_2气凝胶小球的制备和表征  

Preparation and Characterization of Highly Spherical Silica-titania Aerogel Beads with High Surface Area

作　　者：余煜玺[1] 朱孟伟[1] 

机构地区：[1]厦门大学材料学院材料科学与工程系福建省特种先进材料重点实验室,福建厦门361005

出　　处：《材料工程》2017年第2期7-11,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51675452;51302235);航空科学基金资助项目(2013ZD68009)

摘　　要：以正硅酸乙酯(TEOS)和钛酸丁酯(TBT)为共前驱体、乙醇为溶剂、乙酸和氨水为催化剂,采用快速溶胶-凝胶过程和超临界干燥制备得到SiO_2/TiO_2气凝胶小球。对SiO_2/TiO_2气凝胶小球进行SEM,TEM,XRD,FT-IR,TG-DTA和氮气吸附-脱附分析测试发现,SiO_2/TiO_2气凝胶小球粒径为1~8mm,平均粒径约为3.5mm,小球具有纳米多孔网络结构,比表面积高达914.5m2/g,TiO_2颗粒均匀分布于气凝胶结构中,并在高温下保持锐钛矿晶型。The silica-titania aerogel beads were synthesized through sol-gel reaction followed by supercritical drying,in which TEOS and TBT as co-precursors,EtOH as solvents,HAC and NH_3·H_2O as catalysts.The as-prepared aerogel beads were characterized by SEM,TEM,XRD,FT-IR,TG-DTA and nitrogen adsorption-desorption.The results indicate that the diameter distribution of beads are between 1-8mm,the average diameter of beads is 3.5mm.The aerogel beads have nanoporous network structure with high specific surface area of 914.5m^2/g,and the TiO_2 particles are distributed in the aerogel uniformly,which keep the anatase crystal under high temperature.

关 键 词：气凝胶小球 SiO2/TiO2 溶胶-凝胶 超临界干燥 

分 类 号：TB33[一般工业技术—材料科学与工程]