摘要
以十八烷基三甲基溴化铵（STAB）为模板，手性阴离子小分子胶体为结构助剂，采用溶胶一凝胶法制备介孔二氧化硅纳米材料，通过改变胶体与STAB的摩尔比和搅拌速度控制介孔二氧化硅的形貌和孔结构，随着二者的摩尔比从0增加到0．032，其结构从具有螺旋孔道的纳米棒状变为具有同心环形孔道的纳米棒，同时表面逐渐出现层状孔道。另外，搅拌速度的增加有利于纳米棒的形成。
Helical mesoporous silicas were prepared through a sol-gel approach using trimethyl stearyl ammonium bro- mide （STAB） and a chiral low-molecular-weight gelator as a co-structure-directing agent. The morphology and pore ar- chitecture of the mesoporous silicas were controlled by ehanging the gelator/STAB molar ratio and the stilting rate. When the molar ratio increased from 0 to 0.032, the pore architectures of the mesoporous silicas changed from helical to con- centric eireular. Moreover, lamellar mesopores were identified on the surfaces of the mesoporous silicas. It was also found that the increase of the stilTing speed is conducive to the formation of the nanorods.
基金
国家自然科学基金项目（21071103）
