Hierarchically porous monolithic silica with varying porosity using bis(trimethoxysilyl)arenes as precursors
| Autor: | Bernd M. Smarsly, Rüdiger Ellinghaus, Martin von der Lehr |
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| Rok vydání: | 2016 |
| Předmět: |
Scanning electron microscope
chemistry.chemical_element Sorption 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen Catalysis Dibromomethane 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Organic chemistry 0210 nano-technology Benzene Mesoporous material Porosity Ethylene glycol |
| Zdroj: | New Journal of Chemistry. 40:4455-4463 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c6nj00758a |
| Popis: | The ortho-, meta- and para-isomers of bis(trimethoxysilyl)benzene and bis((trimethoxysilyl)phenyl)dimethoxysilane were synthesized from their corresponding diarylbromides. Mixtures of these bis(trimethoxysilyl)arenes and tetramethoxysilane (TMOS) were used as organosilica precursors for the preparation of macro-mesoporous silica monoliths using different amounts of the porogen poly(ethylene glycol) to investigate the effect on the porosity of the final materials. The prepared samples were characterized by nitrogen and dibromomethane sorption measurements, mercury intrusion porosimetry and scanning electron microscopy. The analysis of dibromomethane isotherms indicated a significantly lower polarity of the mesopore surface compared to that of pure SiO2 monoliths, proving the presence of arene units at the mesopore surfaces. |
| Databáze: | OpenAIRE |
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