NEW ROUTE TO MESOPOROUS SILICA ‎VIA A SILSESQUIOXANE PRECURSOR

Ceramics-Silikáty

MarciniakPiotr¹  Robert Przekop¹  Bogna Sztorch¹  MarciniecBogdan²  ZielinskiMichal²  PietrowskiMariusz²  Osinska-BroniarzMonika²  MartylaAgnieszka² 

[1] Adam Mickiewicz University in Poznan, Centre of Advanced Technologies, Umultowska 89c, 61-614 Poznan, Poland. ;;

关键词: Octaanion;    Porous materials;    Textural promoters;    Silsesquioxane;   

DOI  :  10.13168/cs.2018.0037

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown