INFLUENCE OF XYLENE ON THE TEXTURAL FEATURES OF THE HYBRID GEL MATERIALS
Nina E. Velikova, Yuliya E. Vueva, Yordanka Y. Ivanova, Isabel M. Salvado, Maria H. Fernandes
Pagini: 162-168
Publicat: 2 Jun 2014
Vizualizări: 3,887
Descărcări: 830
Rezumat: Mesoporous hybrid- organic-inorganic silicas with amine bridging group within the framework were synthesized by co-condensation of BTPA and TEOS under acidic conditions in the presence of amphihilic triblock-copolymer poly (ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (PEO20PPO70PEO20), commonly known by the trade name Pluronic P123), as a structural directing agent for obtaining of mesoporous structure, and xylene as swelling agent. In our work we investigate the influence of the xylene amount on the pore size and surface area of the final hybrid materials. The resultantmaterials were true hybrids confirmed by 29Si MAS NMR and 13C CP MAS NMR analyses. Increasing the amount of xylene slightly decreased the mesopore size of all hybrids with high content of TEOS. The compositions with highest content of BTPA showed most significant increase in pore size due to the higher amount of the flexible organic chains present in the structure that make the framework more flexible and collapse resistant.
Cuvinte cheie: sol-gel, mesoporous materials, hybrid materials, surfactant, pore swelling agent
Citează acest articol: Nina E. Velikova, Yuliya E. Vueva, Yordanka Y. Ivanova, Isabel M. Salvado, Maria H. Fernandes. INFLUENCE OF XYLENE ON THE TEXTURAL FEATURES OF THE HYBRID GEL MATERIALS. Journal of International Scientific Publications: Materials, Methods & Technologies 8, 162-168 (2014). https://www.scientific-publications.net/en/article/1000159/
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