頁籤選單縮合
題 名 | Detailed Structural Characterizations of SBA-15 and MCM-41 Mesoporous Silicas on a High-Resolution Transmission Electron Microscope |
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作 者 | 林弘萍; 湯致遠; 林錦燕; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 49:6 2002.12[民91.12] |
頁 次 | 頁981-988 |
分類號 | 341.37 |
關鍵詞 | M41S; MCM-41; SBA-15; Mesoporous molecular sieves; HR-TEM; |
語 文 | 英文(English) |
英文摘要 | Using high-resolution transmission electronic micrograph. (HR-TEM) observation. one can clearly see the pore geometry of the MCM-41 and SBA-15 mesoporous silicas to determine that their pore shapes are hexagonal and round, respectivly. With the perpendicular orientations of the nanochannels to the electron beam, parallel line images of the (100) and (110) repeating spacings were observed. In the SBA-15 mesoporous silicas, there are byproducts of the granular silica and disordered mesostructures, attributed to the weak hydrogen interactions between Pluronic 123 blockcopolymer and the silica species. There are also many different and significant + π disclination defects in SBA-15 and MCM-41 surfactant-silica composites. The SBA-15 with a thicker silica wall is more stable under irradiation by high-energy electron beams compared to MCM-41, which has thinner wall thickness. Some carbon nanostructure impurities were found in some carbon films on the metal grids. |
本系統中英文摘要資訊取自各篇刊載內容。