Hybrid ethane–siloxane mesoporous materials with cubic symmetry

✍ Scribed by Shiyou Guan; Shinji Inagaki; Tetsu Ohsuna; Osamu Terasaki

• Book ID: 104430341
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 274 KB
• Volume: 44-45
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(01)00181-0

✦ Synopsis

The structure of and synthesis conditions for an organic±inorganic hybrid mesoporous material, HMM-3, containing ethane fragments (±CH 2 CH 2 ±) within the pore walls were studied. High resolution transmission electron microscope images and electron diraction patterns obtained for dierent crystal axes of HMM-3 indicated that it was of the cubic Pm-3n space group, similar to mesoporous silica SBA-1. Scanning electron micrographs of HMM-3 in different directions con®rmed that all of the produced HMM-3 particles had the crystal-like external morphology of a decaoctahedron (18-hedron) with six square {1 0 0} and 12 hexagon {1 1 0} planes with a cubic symmetry. The synthesis conditions for HMM-3 were optimized in a synthesis system comprising 1,2-bis(trimethoxysilyl)ethane (BTME), hexadecyltrimethylammonium chloride (C 16 TMA), sodium hydroxide (NaOH), and water (H 2 O). The highly ordered HMM-3 material was obtained at 95°C with the mixture ratio of BTME:C 16 TMA:NaOH:H 2 O 5:27:4.79:12:1773. The C 16 TMA/BTME ratio and C 16 TMA concentration aected the structural order of the produced mesophase. Only the cubic Pm-3n phase was formed even though the C 16 TMA/BTME ratio and the C 16 TMA concentration were varied with in wide ranges at 95°C.