ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 62, (4) 403 - 410 (2018)

Przekop Robert 1, Sztorch Bogna 1,2, Zielinski Michal 2, Pietrowski Mariusz 2, Marciniak Piotr 1, Martyla Agnieszka 3, Osinska-Broniarz Monika 3, Marciniec Bogdan 2 , 1
1 Adam Mickiewicz University in Poznan, Centre of Advanced Technologies, Umultowska 89c, 61-614 Poznan, Poland.
2 Adam Mickiewicz University in Poznan, Faculty of Chemistry, Umultowska 89b, 61-614 Poznan, Poland.
3 Institute of Non-Ferrous Metals, Division in Poznan, Central Laboratory of Batteries and Cells, Forteczna 12, 61-362 Poznan, Poland.

Keywords: Octaanion, Porous materials, Textural promoters, Silsesquioxane

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.

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doi: 10.13168/cs.2018.0037
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