HRTEM imaging of mesoporous phase transition from hexagonal P6mm to cubic Ia 3̄d symmetry
Studies in Surface Science and Catalysis, cilt.154 A, ss.400-407, 2004 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Özet
- Cilt numarası: 154 A
- Basım Tarihi: 2004
- Doi Numarası: 10.1016/s0167-2991(04)80829-2
- Dergi Adı: Studies in Surface Science and Catalysis
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.400-407
- Atatürk Üniversitesi Adresli: Hayır
Özet
The successful synthesis of large pore bicontinuous cubic mesoporous solid using the triblock co-polymer PEO-PPO-PEO (P123) as a template and 3-mercaptopropyltriethoxysilane (MPTS) and tetraethylorthosilicate (TEOS) as silica sources has been recently reported. We present here High Resolution Transmission Electron Microscopy (HRTEM) imaging of samples of these and related mesoporous materials prepared under aqueous and hydrothermal conditions. This provides evidence suggesting that the transition from the hexagonal to cubic bicontinuous structure is governed by the amount of MPTS added to the synthesis gel and the synthesis temperature, for conditions described. In addition we also investigate the formation of the bicontinuous cubic structure analogous to MCM-48 through the addition organosilane phenyltriethoxysilane.