1. NEW ROUTE TO MESOPOROUS SILICA VIA A SILSESQUIOXANE PRECURSOR
- Author
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Monika Osinska-Broniarz, Robert E. Przekop, Michał Zieliński, Bogdan Marciniec, Mariusz Pietrowski, Piotr Marciniak, Martyla Agnieszka, and Bogna Sztorch
- Subjects
Silsesquioxane ,Materials science ,General Chemical Engineering ,Textural promoters ,02 engineering and technology ,Mesoporous silica ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Analytical Chemistry ,lcsh:TP785-869 ,chemistry.chemical_compound ,lcsh:Clay industries. Ceramics. Glass ,chemistry ,Chemical engineering ,Materials Chemistry ,Ceramics and Composites ,Octaanion ,Porous materials ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
The effect of the addition of octakis(tetramethylammonium)-t8-silsesquioxane (octaanion) on the modification of the porous structure of the silica gel obtained by the sol-gel method catalysed by acetic acid was studied. The obtained silica gel was characterised by the low-temperature nitrogen adsorption/desorption method (BET), powder diffraction (XRD), thermogravimetry (TG) and microscopic observations (TEM). The octaanion was found to act as a textural promoter, as evidenced by almost a 25% increase in the surface area of the obtained silica. As a result of the stabilisation in the porous structure of the silica gel, the tetramethylammonium groups of the octaanion show higher thermal stability than the groups present in the octaanion structure or those introduced in the form of tetramethylammonium hydroxide. Tetramethylammonium ions were proved to show increased thermal resistance, which is related to the porous properties of the SiO₂ matrix.
- Published
- 2018