具有双孔径分布的介孔C-Al_2O_3-TiO_2纳米复合材料的合成及其红外发射率  

Synthesis and Infrared Emissivity of Ordered Mesoporous C-Al_2O_3-TiO_2 Nanocomposites with a Dual Pore System

作　　者：李国显[1] 王涛[1] 何建平[1] 周建华[1] 薛海荣[1] 马一鸥[1] 胡园园[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016

出　　处：《物理化学学报》2011年第1期248-254,共7页Acta Physico-Chimica Sinica

基　　金：航空科学基金(2007ZF52061);国家自然科学基金(50871053)资助项目~~

摘　　要：以嵌段共聚物F127(PEO106PPO70PEO106,MW=12600)为模板剂,异丙醇铝和钛酸四丁酯为金属源,低分子量的酚醛树脂为碳源,通过溶胶-凝胶三元共组装法合成了具有双孔径分布的C-Al2O3-TiO2纳米复合材料.用X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)及N2吸附-脱附对该复合材料进行结构表征.结果显示,当铝钛原子的摩尔比为1:10时,对应的纳米复合材料具有较好的有序介孔结构,其双孔径分别为3.9和6.5nm,比表面积可达259m2·g-1,孔容0.37cm3·g-1.以三元乙丙橡胶(EPDM)为粘结剂,与介孔纳米复合材料混合制备涂层.通过调节复合材料中铝钛摩尔比和涂层厚度,红外发射率在0.450-0.617之间可调.C-Al2O3-TiO2 nanocomposites with a dual pore system were synthesized via the sol-gel tri-constituent co-assembly process using an amphiphilic triblock copolymer F127（PEO106PPO70PEO106,MW=12600） as a template,aluminum isopropoxide and tetrabutyl titanate as metallic sources and resol as an organic precursor.X-ray diffraction（XRD）,transmission electron microscopy（TEM）,scanning electron microscopy（SEM）,and nitrogen adsorption/desorption were used to characterize the structures of these nanocomposites.The results show that the nanocomposite with a Al/Ti molar ratio of 1：10 has ordered mesoporous structures with a dual system of 3.9 and 6.5 nm,a high specific surface area of 259 m2·g-1 and a pore volume of 0.37 cm3·g-1.Low infrared emissivity coatings were obtained using the ethylene-propylene-diene monomer（EPDM） as an adhesive and the ordered mesoporous C-Al2O3-TiO2 nanocomposites as a filling.As the Al/Ti molar ratio and coat thickness changed the infrared emissivities changed from 0.450 to 0.617.

关 键 词：介孔 有序 C-Al2O3-TiO2纳米复合材料 双孔径 红外发射率 

分 类 号：TB383.1[一般工业技术—材料科学与工程]