模板剂结构和合成温度对两步法制备介孔硅结构的影响  

Effects of Template and Synthetic Temperature on the Structure of Mesoporous Silica during a Two-Step Synthesis

作　　者：金政伟[1] 王建清[1] 高文华[1] 

机构地区：[1]天津科技大学包装与印刷工程学院,天津300222

出　　处：《天津科技大学学报》2010年第1期35-38,72,共5页Journal of Tianjin University of Science & Technology

基　　金：国家科技支撑计划课题(2006BAD30B02-3);天津科技大学引进人才科研启动基金资助项目(20070444)

摘　　要：以F108和F127为模板剂,在不添加无机盐或辅助剂情况下,采用两步法在弱酸性体系中分别制备了具有Im3m结构的SBA-16及Fm3m结构的FDU-12硅基介孔材料.采用X射线衍射(XRD)、透射电子显微镜(TEM)及氮气吸附-脱附对其进行了表征,结果显示:在此条件下制备的两种不同结构的立方介孔硅均为典型的小孔(3.57～4.26 nm)厚壁(9.68～9.81.nm)型硅基介孔材料.结合制备过程中反应物组成及合成温度对形成小孔厚壁型介孔材料的过程进行了讨论.对体系合成温度变化的研究表明:温度的微小变化对最终产物有序性有着很大的影响,而最终产物的结构则是由所用的模板剂结构决定的.Two kinds of well-ordered mesoporous silica materials with cubic mesostructures were synthesized by using triblock copolymer F108 and F127 as templates without the addition of inorganic slat via a novel two-step pathway under mildly acidic conditions. The prepared SBA-16-type having Irn3rn cubic mesostructure and FDU-12-type having Frn3m cubic mesostructure were proved by the well-defined X-ray diffraction patterns combined with transmission electron microscopy. The nitrogen adsorption-desorption analysis reveals that both types of the mesoporous materials have a uniform small-sized pore diameter （3.57-4.26 nm）and very thick pore wall （9.68-9.81 nm）. Moreover,the mechanisms for the small pore thickwalled mesoporous silcas were discussed based on the composition of the reactant used. Evaluation on structure dependence of the synthetic conditions demonstrated that,for the samples synthesized through the two-step route ,minor variation of the temperature has a significant effect on the ordering of the prepared materials ,and that the structure of final products was determined the structure of nonionic triblock copolymer used.

关 键 词：非离子模板剂 介孔硅 小孔厚壁 两步法 

分 类 号：TQ425.25[化学工程]