| 초록 |
Mesoporous silica was synthesized by using the mixed micellar systems of cationic surfactant, cetyltrimethyl ammonium bromide (CTAB) and nonionic surfactant, polyoxyethylene (10) cetyl ether (C16EO10) in acidic condition. The results show that pore size and wall-thickness of silica mesostructures can be controlled by changing the ratio of nonionic to cationic surfactant in mixed micellar solution, since the size of mesopore templated by mixed nonionic-cationic micelles is larger than that synthesized with cationic surfactant, CTAB alone. The wall-thickness of mesopore, which is critical to thermal stability of mesoporous materials also increased with the amount of C16EO10. The mesophases of silica composed by the mixed micelles of CTAB and C16EO10 were affected seriously by the amount of HCl, since the hexagonal arrangement of channels of mesoporous silica, SBA-3 (p6mm) was observed in samples synthesized with a molar ratio of HCl/H2O < 0.024. In higher HCl amount range, the mesostructure exhibits two-separated phases, which may be caused by the two-coexisting micelles (CTAB-rich micelles and C16EO10-rich micelles) in mixed surfactant solution. Finally, the mixed surfactant templating route was revealed as a useful method to control the pore size and wall-thickness of mesoporous materials. |
