Preparation of Mesoporous SiO2 via of Triblock Copolymer

Abstract

Abstract: The mesoporous SiO₂ xerogels with controlled texture were obtained using TEOS as precursor in the
presence of Polyethylene Oxide (PEO)- Polypropylene Oxide (PPO)- Polyethylene Oxide (PEO) by sol-gel method. By means of BET, TG/DTA, FT--IR and ²⁹Si
NMR analysis, the sol-gel chemistry was investigated and the effects of heat treatment in different conditions were also discussed. The results show that
the triblock copolymer molecular chain, additive amount and ageing time of SiO₂ sol can adjust available the texture properties of mesoporous
SiO₂, and in different atmospheres, the removed mechanism of such copolymer is different, which results in the different effects on the
mesoporous SiO₂. As a result, the mesoporous SiO₂ has stronger flexible skeleton, narrower pore distibution, and higher thermal stability
by vacuum heat-treatment.

Key words: mesoporous SiO₂, pore distribution, sol-gel, heat-treatment

CLC Number:

TM285

SUN Ji-Hong,FAN Wen-Hao,ZHANG Bin,WU Dong,SUN Yu-han,YANG Nian-Hua,ZHOU Jian-Wei,YUE Yong. Preparation of Mesoporous SiO₂ via of Triblock Copolymer[J]. Journal of Inorganic Materials.

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Preparation of Mesoporous SiO₂ via of Triblock Copolymer

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