| 초록 |
In the present study, mesoporous silica was fabricated by using triblock copolymer templates (poly (ethylene oxide) (PEO) and poly(propylene oxide) (PPO)). The prepared silica structure was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and N2 sorption experiment. The ultramicrotome method was used to observe the pore structure in arbitrary orientation. Specifically, we prepared SBA-15 with long-range 2-dimensional hexagonal arrangement of 4-10 nm feature spacing, and mesocellular silica forms (MCF) with larger pores of 15-30 nm by using xylene as a hydrophobic swelling agent. The pore size and ordering were influenced by pH and the concentration of organic solvent. In acid condition, well-ordered hexagonal arrangement of mesopores was prevalent. However, as pH increased by adding ammonium hydroxide, the pore structure was transformed from ordered to disordered state. As expected, the pore size increased with the xylene content up to a certain saturation value above which the pore size remained constant. |
