| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 나노구조와 물성 |
| 제목 | Preparation of Mesoporous Silica with Dual Pore Structure Derived from Porogen-Grafted Silica Precursors |
| 초록 | Several attempts have recently been made to realize mesoporous silicas with bimodal pore structure. Well-defined hierarchical mesoporous silicas with long-range order of pores and the narrow pore size distribution are quite desirable for electronic, optical and sensor devices. Generally Polystyrene (PS) beads have been used for the generation of macropores, however physical templating methods may not be easy or cheap spurring to conduct active research for chemical templating methods by which larger mesopores are achieved in a controlled way. Here, we report a more direct method to prepare ordered mesoporous silica with bimodal pore structure from co-condensation of TEOS and porogen-grafted trimethoxysilane using Pluronic P123 (EO20PO70EO20, Mw = 5,800) as as a structure-directing agent. A porogen-grafted silica, with carbon cages such as adamantylphenols chemically linked to silsesquioxane precursors, was designed produced in our laboratory. Thermally activated removal of porogens, has the ability to introduce additional secondary pores in addition to the primary mesopores formed by the block template. Without the adamantane-grafted trimethoxysilane, hexagonally ordered (p6mn) primary pores with pore size around 6.4 nm are obtained whereas two distinct 7.5 nm and 3 nm mesopores are obtained with a mixture of TEOS and adamantine-grafted silica. It is shown that the relative concentration of TEOS over the adamantine-grafted silica precursors is crucial to realize well-defined bimodal mesoporous silica with a hexagonal long-range order and the secondary pores can also be located either near or far away from the primary pores depending on the chemical structure of such pore-generating moieties. |
| 저자 | 조휘랑1, 차봉준1, 김지만2, 차국헌1 |
| 소속 | 1서울대, 2성균관대 |
| 키워드 | bimodal silica; P123; porogen-grafted silica |
