| 초록 |
Mesoporous SBA-15 silica which has controllable large mesopore sizes (5-15 nm) with narrow size distribution,modifiable high surface areas (700-900 m2/g), hydrothermally stable frameworks (3-6 nm), and tuneable micro-(or secondary meso-) pores, are one of the most requently investigated materials with increasing interests forvarious practical applications such as separation, wave guide, host/guest chemistry, water purification, templatefor nano-replication, and catalyst supports. Besides the basic advantages of SBA-15 based on the structuralproperties, control of overall morphology is an additional prerequisite for improving performances in the aboveapplications. we demonstrate a general shape-selective synthesis methodology of SBA-15 materials that usesfundamental synthesis conditions, i.e., initial temperature, average micelle packing parameter (g value) and useof a specific additive (KCl). The control of fundamental synthesis conditions allowed morphologies of SBA-15over a wide range of size. Furthermore, the insights into the morphological formation of SBA-15 providedbythe relationships between the morphogenesis and the fundamental synthesis conditions may also be useful forthe morphological design of various meso structuredmaterials. |
