| Autor: |
Mohanty P; Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA., Linn NM, Landskron K |
| Jazyk: |
angličtina |
| Zdroj: |
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2010 Jan 19; Vol. 26 (2), pp. 1147-51. |
| DOI: |
10.1021/la902239m |
| Abstrakt: |
Periodic mesoporous organosilicas (PMOs) with methane and ethane bridging groups were synthesized by the condensation of bis(triethoxysilyl)methane and bis(triethoxysilyl)ethane, respectively, in an ultrafast sonochemical method with a short reaction time of 30 min using a cationic template (1-hexadecyl)trimethylammonium bromide (HTABr). Subsequently, the template HTABr was extracted by another 30 min of sonication in an acetone/HCl mixture. The whole experimental process for the synthesis and extraction of the PMOs took about 1 h, which is much shorter than any other reported methods. Both the PMOs have very high surface areas of 1200-1390 m(2) g(-1) with a narrow pore size distribution of approximately 3 nm. This sonochemical method further extended for the synthesis of large pore (pore size of approximately 5 nm) methane and ethane bridged PMOs using a triblock copolymer Pluronic P123 as template. The methane and ethane bridged PMO materials thus obtained were characterized by small-angle X-ray scattering, transmission electron microscopy, nitrogen sorption, and solid-state NMR techniques. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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