| 초록 |
Formation of mesoporous silica materials has been studied using mixtures of amphiphilic block copolymers as the structure-directing agents and sodium silicate as the silica source. X-ray diffraction patterns and transmission electron spectroscopic images for the mesoporous silica materials thus obtained indicate that mesostructures are transformed from lamella to 2-d hexagonal (P6mm), 3-d hexagonal (P63/mmc), cubic Pm3m and cubic Im3m, as the size of EO group increases. Particle morphologies of the mesoporous silica materials are changed from sheet-like to irregular, facetted cubic depending on the mesostructures. Optimum ratios between the hydrophilic EO groups and hydrophobic tail groups are also investigated in order to obtain highly ordered mesoporous silica materials. In addition, mesoporous silica materials with the same structures but different pore sizes can be readily obtained through the present synthetic approach. |
