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Preparation of Mesoporous SiO_2 via of Triblock Copolymer

SUN Ji-Hong;FAN Wen-Hao;ZHANG Bin;WU Dong;SUN Yu-han;YANG Nian-Hua;ZHOU Jian-Wei;YUE Yong(1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences,Taiyuan 030001, China; 2. State Key Laboratory of Magnetic Reson  
The mesoporous SiO_2 xerogels with controlled texture were obtained using TEOS asprecursor in the presence of Polyethylene Oxide (PEO)-Polypropylene Oxide (PPO)-PolyethyleneOxide (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 werealso discussed. The results show that the triblock copolymer molecular chain, additive amountand ageing time of SiO2 sol can adjust available the texture properties of mesoporous SiO2, and indifferent atmospheres, the removed mechanism of such copolymer is different, which results in thedifferent effects on the mesoporous SiO2. As a result, the mesoporous SiO2 has stronger flexibleskeleton, narrower pore distibution, and higher thermal stability by vacuum heat-treatment.
【Fund】: 国家杰出青年科学基金!29625307
【CateGory Index】: TM285
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