Preparation of well-ordered nanoporous materials by using the colloidal array of silica nanopsheres

我们最近首创了一种液相法制备尺寸为12 nm的均匀尺寸二氧化硅纳米球（SNSs）及其在溶剂蒸发后的三维有序排列。首先，通过种子再生方法成功地控制了14 ~ 550 nm范围内的球体尺寸。将二氧化硅纳米球胶体阵列的密闭空间合成方法应用于钽酸钠（NaTaO_3）的制备；NaOH与Ta_2O_5在三维介孔碳的孔隙中进行了水热反应，并用20 nm大小的二氧化硅纳米微球（SNSs）胶体阵列进行了复制。成功制备了三甲基硅基化含钛介孔二氧化硅纳米微球。三甲基硅基化改善了材料的疏水性，使材料的形态和钛的配位保持完整。由此制备的三甲基硅基化Ti-MSNSs在各种体积烯烃的环氧化反应中表现出较高的催化性能

A liquid-phase method for preparing uniform-sized silica nanospheres(SNSs) 12 nm in size and their three-dimensionally ordered arrangement upon solvent evaporation have recently been pioneered by us. Firts, the successful control of the sphere sizes in the wide range from 14 to 550 nm has been achieved by the seed regrowth method. The confined space synthesis method using the colloidar array of silica nanospheres has been applied to the preparation of sodium tantalate(NaTaO_3); hydrothermal reaction of NaOH and Ta_2O_5 was carried out in the pores of three-dimensional mesoporous carbon, which was replicated by the colloidal array of silica nanospheres(SNSs) 20 nm in size. Trimethylsilylated Ti-containing mesoporous silica nanospheres(Ti-MSNSs) have been successfully prepared. The trimethylsilylation improved a hydrophobicity of the material with its morphology and the coordination of Ti species intact. Thus prepared trimethylsilylated Ti-MSNSs exhibited a higher catalytic performance in the epoxidations of various bulky olefins