Jump to main content
Jump to site search

Issue 40, 2017
Previous Article Next Article

Preparation of highly ordered mesoporous ethane–silicas under weakly acidic conditions and their hydrothermal stability

Author affiliations

Abstract

Periodic mesoporous organosilicas were prepared using 1,2-bis(triethoxysilyl)ethane (BTEE) in the presence of a poly(ethylene oxide)-b-poly(D,L-lactic acid-co-glycolic acid)-b-poly(ethylene oxide) triblock copolymer (LGE538) template under strongly and weakly acidic conditions. White solid powders were obtained even under weakly acidic conditions using iron chloride hexahydrate. Small angle X-ray scattering (SAXS) and nitrogen adsorption isotherms showed a highly ordered hexagonal (p6mm) mesostructure and a high specific surface area of around 1000 m2 g−1. The hydrothermal stability of these materials was also investigated because it is a crucial factor in their usage in the chemical industry. The powders were placed in sealed vials inside a convection oven at 373 K for 4 weeks. The hydrothermally treated samples were analyzed every week over the 4 weeks using SAXS and nitrogen adsorption. Solid-state 29Si CP-MAS NMR analysis was also performed to observe the stability of siloxane bonds over the 4 weeks of hydrothermal treatment. The results indicate that the ethane–silica samples show quite good stability, which makes them attractive as catalysts or supporting materials for up to one month.

Graphical abstract: Preparation of highly ordered mesoporous ethane–silicas under weakly acidic conditions and their hydrothermal stability

Back to tab navigation

Supplementary files

Publication details

The article was received on 28 Jul 2017, accepted on 11 Sep 2017 and first published on 11 Sep 2017


Article type: Paper
DOI: 10.1039/C7TA06614G
Citation: J. Mater. Chem. A, 2017,5, 21378-21388
  •   Request permissions

    Preparation of highly ordered mesoporous ethane–silicas under weakly acidic conditions and their hydrothermal stability

    E. Choi, E. Cho and M. Jaroniec, J. Mater. Chem. A, 2017, 5, 21378
    DOI: 10.1039/C7TA06614G

Search articles by author

Spotlight

Advertisements